| ENGINEERING | ORGANISM | UNIPROT ACCESSION NO. | COMMENTARY | LITERATURE |
| D549A | Human Immunodeficiency Virus | - | mutation in polypeptide p66, decrease in RNase H activity | 698709 |
| D549N | Human Immunodeficiency Virus | - | mutation in polypeptide p66, decrease in RNase H activity | 698709 |
| E478Q | Human Immunodeficiency Virus | - | the efficiency with which mutant RT catalyzes transfer of nascent DNA between RNA templates is severely reduced | 696185 |
| E478Q | Human Immunodeficiency Virus | - | mutation in polypeptide p66, loss of RNase H activity | 698709 |
| A360I | Human immunodeficiency virus 1 | - | mutation in the connection domain, the mutation significantly contributes to zidovudine resistance | 716993 |
| A360I/V | Human immunodeficiency virus 1 | - | site-directed mutagenesis, a connection/RNase H domain mutant | 716995 |
| A360K | Human immunodeficiency virus 1 | - | naturally occuring mutation in HIV infection patients, the mutation increases zidovudine resistance and decreased reverse trancriptase template switching | 716993 |
| A360V | Human immunodeficiency virus 1 | - | mutation in the connection domain, the mutation significantly contributes to zidovudine resistance | 716993 |
| A360V | Human immunodeficiency virus 1 | - | naturally occuring mutant from clinical isolates, a connection/RNase H domain mutant that shows reduced RNase H activity | 716995 |
| A371V | Human immunodeficiency virus 1 | - | the E312Q, G333E, G335D, V365I, A371V and A376S substitutions in RNase H subdomain of HIV-1 reverse transcriptase are present in 26% of subtype B, whereas the G335D and A371V substitutions are commonly observed in 69% and 75% of non-B HIV-1 isolates, respectively | 707178 |
| A371V | Human immunodeficiency virus 1 | - | mutation in the connection domain | 716993 |
| A371V | Human immunodeficiency virus 1 | - | site-directed mutagenesis, a connection/RNase H domain mutant | 716995 |
| A376S | Human immunodeficiency virus 1 | - | the E312Q, G333E, G335D, V365I, A371V and A376S substitutions in RNase H subdomain of HIV-1 reverse transcriptase are present in 26% of subtype B. Mutations N348I, A376S and Q509L do confer varying amounts of nevirapine resistance by themselves, even in the absence of excision-enhancing mutations | 707178 |
| A376S | Human immunodeficiency virus 1 | - | mutation in the connection domain, the mutation significantly contributes to zidovudine resistance | 716993 |
| A400T | Human immunodeficiency virus 1 | - | mutation in the connection domain | 716993 |
| A554K | Human immunodeficiency virus 1 | - | naturally occuring mutation in HIV infection patients, the mutation renders the patient more prevalent amongst treatment-experienced patients, treatment with nucleoside reverse transcriptase inhibitors and nonnucleoside reverse transcriptase inhibitors | 716993 |
| A554L | Human immunodeficiency virus 1 | - | naturally occuring mutation in HIV infection patients, the mutation renders the patient more prevalent amongst treatment-experienced patients, treatment with nucleoside reverse transcriptase inhibitors and nonnucleoside reverse transcriptase inhibitors | 716993 |
| A554T | Human immunodeficiency virus 1 | - | naturally occuring mutation in HIV infection patients, the mutation renders the patient more prevalent amongst treatment-experienced patients, treatment with nucleoside reverse transcriptase inhibitors and nonnucleoside reverse transcriptase inhibitors | 716993 |
| C280E | Human immunodeficiency virus 1 | - | RNase H activity similar to wild-type | 652907 |
| C280H | Human immunodeficiency virus 1 | - | RNase H activity similar to wild-type | 652907 |
| C280L | Human immunodeficiency virus 1 | - | RNase H activity similar to wild-type | 652907 |
| C280M | Human immunodeficiency virus 1 | - | RNase H activity similar to wild-type | 652907 |
| C280P | Human immunodeficiency virus 1 | - | significant reduction in RNase H activity. A heterodimer p66C280p/p51C280P shows about 8% of wild-type RNaseH activity, 6% of strand transfer activity, and 105% of DNA polymerase activity. A heterodimer p66C280P/p51 shows about 60% of wild-type RNaseH activity, 80% of strand transfer activity, and 100% of DNA polymerase activity. A heterodimer p66/p51C280W shows about 30% of wild-type RNaseH activity, 6% of strand transfer activity, and 99% of DNA polymerase activity | 652907 |
| C280Q | Human immunodeficiency virus 1 | - | RNase H activity similar to wild-type | 652907 |
| C280R | Human immunodeficiency virus 1 | - | RNase H activity similar to wild-type | 652907 |
| C280S | Human immunodeficiency virus 1 | - | RNase H activity similar to wild-type | 652907 |
| C280S | Human immunodeficiency virus 1 | - | site-directed mutagenesis | 714475 |
| C280S/K172A/K173A | Human immunodeficiency virus 1 | - | p66/p51 HIV-1 reverse transcriptase 52A mutant variant, the mutation C208S resides in both subunits, the p66 subunit also contains the mutations K172A and K173A | 715864 |
| C280W | Human immunodeficiency virus 1 | - | significant reduction in RNase H activity. A heterodimer p66C280W/p51C280W shows about 11% of wild-type RNaseH activity, 6% of strand transfer activity, and 100% of DNA polymerase activity. A heterodimer p66C280W/p51 shows about 44% of wild-type RNaseH activity, 80% of strand transfer activity, and 98% of DNA polymerase activity. A heterodimer p66/p51C280W shows about 29% of wild-type RNaseH activity, 7% of strand transfer activity, and 100% of DNA polymerase activity | 652907 |
| C280Y | Human immunodeficiency virus 1 | - | RNase H activity similar to wild-type | 652907 |
| D549N | Human immunodeficiency virus 1 | - | mutation increases the 3'-azido-3'-deoxythymidine concentration needed to inhibit viral replication by 50% 12fold by increasing the time available for excision of incorporated nucleoside reverse transcriptase inhibitors from terminated primers and results in 5- to 10fold reduction in viral titers in a single-replication cycle assay | 700927 |
| D67N | Human immunodeficiency virus 1 | - | thymidine analogue mutation, TAMs, arising with zidovudine and stavudine treatment, take the TAM-2 pathway | 716993 |
| D67N | Human immunodeficiency virus 1 | - | mutation involved in zidovudine resistance | 716994 |
| D67N/K70R/T215F | Human immunodeficiency virus 1 | - | site-directed mutagenesis | 690924 |
| D67N/K70R/T215F/Q509L | Human immunodeficiency virus 1 | - | site-directed mutagenesis | 690924 |
| E312Q | Human immunodeficiency virus 1 | - | the E312Q, G333E, G335D, V365I, A371V and A376S substitutions in RNase H subdomain of HIV-1 reverse transcriptase are present in 26% of subtype B | 707178 |
| E312Q | Human immunodeficiency virus 1 | - | mutation in the connection domain, the mutation significantly contributes to zidovudine resistance | 716993 |
| E396A | Human immunodeficiency virus 1 | - | naturally occuring mutation in HIV infection patients, the mutation increases zidovudine resistance and decreased reverse trancriptase template switching | 716993 |
| E399D | Human immunodeficiency virus 1 | - | mutation in the connection domain | 716993 |
| E44A | Human immunodeficiency virus 1 | - | mutation involved in lamivudine resistance | 716994 |
| E44D | Human immunodeficiency virus 1 | - | mutation involved in lamivudine resistance | 716994 |
| E475A | Human immunodeficiency virus 1 | - | site-directed mutagenesis, the mutant shows only minimally altered substrate specificity or enzyme activity compared to the wild-type enzyme. But the efficiency with which most mutants catalyzed polymerization-independent RNase H cleavage is sharply reduced. This deficiency is more pronounced when the mutant enzyme is challenged to process the (+) strand polypurine tract (PPT) primer from either (+) RNA or a PPT/(+) DNA RNA/DNA chimera | 650155 |
| E478Q | Human immunodeficiency virus 1 | - | mutation in isolated RNase H domain, mutant fails to bind RNA/DNA hybrids. Structure of mutant is similar to wild-type | 698692 |
| E478Q | Human immunodeficiency virus 1 | - | RNase H active site mutant | 715532 |
| E478Q/N348I | Human immunodeficiency virus 1 | - | mutation of RNase H active site and connection domain | 715532 |
| E706Q | Human immunodeficiency virus 1 | - | site-directed mutagenesis of HIV-1 reverse transcriptase, inactive mutant; site-directed mutagenesis of the recombinant mutant construct G, E706 in construct G corresponds to E478 in HIV-1 reverse transcriptase, inactive mutant | 713774 |
| E89K | Human immunodeficiency virus 1 | - | mutation involved in foscarnet resistance | 716994 |
| F160S | Human immunodeficiency virus 1 | - | site-directed mutagenesis | 714475 |
| F227L | Human immunodeficiency virus 1 | - | mutation involved in non-nucleoside reverse transcriptase inhibitor resistance | 716994 |
| G190A | Human immunodeficiency virus 1 | - | site-directed mutagenesis, the mutant virus shows moderately reduced fitness compared to that of the wild-type virus | 716067 |
| G190A | Human immunodeficiency virus 1 | - | mutation involved in non-nucleoside reverse transcriptase inhibitor resistance | 716994 |
| G190S | Human immunodeficiency virus 1 | - | site-directed mutagenesis, the mutant virus shows moderately reduced fitness compared to that of the wild-type virus | 716067 |
| G333D | Human immunodeficiency virus 1 | - | mutation in the connection domain | 716993 |
| G333E | Human immunodeficiency virus 1 | - | the E312Q, G333E, G335D, V365I, A371V and A376S substitutions in RNase H subdomain of HIV-1 reverse transcriptase are present in 26% of subtype B | 707178 |
| G333E | Human immunodeficiency virus 1 | - | mutation in the connection domain | 716993 |
| G335C | Human immunodeficiency virus 1 | - | mutation in the connection domain, the mutation significantly contributes to zidovudine resistance | 716993 |
| G335D | Human immunodeficiency virus 1 | - | the E312Q, G333E, G335D, V365I, A371V and A376S substitutions in RNase H subdomain of HIV-1 reverse transcriptase are present in 26% of subtype B, whereas the G335D and A371V substitutions are commonly observed in 69% and 75% of non-B HIV-1 isolates, respectively | 707178 |
| G335D | Human immunodeficiency virus 1 | - | mutation in the connection domain, the mutation significantly contributes to zidovudine resistance | 716993 |
| G359A | Human immunodeficiency virus 1 | - | naturally occuring mutation in HIV infection patients, the mutation increases zidovudine resistance and decreased reverse trancriptase template switching | 716993 |
| G509L | Human immunodeficiency virus 1 | - | Glu to Leu substitution at residue 509 in the ribonuclease H domain of HIV-1 reverse transcriptase confers zidovudine resistance, mechanism, overview. Q509L increases zidovudine monophosphate excision activity of RT on RNA/DNA template/primers, but not DNA/DNA template/primers, due to Q509L decreasing a secondary RNase H cleavage event that reduces the RNA/DNA duplex length to 10 nucleotides and significantly impairs the enzyme's ability to excise the chain-terminating nucleotide. Mutation Q509L does not affect initial rates of the polymerase-directed RNase H activity but only polymerase-independent cleavages that occur after a template/primer dissociation event. Q509L decreases the affinity of the enzyme to bind template/primers with duplex lengths less than 18 nucleotides in the polymerase-independent RNase H cleavage mode, while not affecting the enzyme's affinity to bind the same template/primers in an zidovudine monophosphate excision competent mode | 690924 |
| G544Stop | Human immunodeficiency virus 1 | - | C-terminal truncation of p66 polypeptide. Loss of RNase H activity, while dimerization with polypepitde p51 and DNA polymerase activity are not significantly affected | 698701 |
| H539F | Human immunodeficiency virus 1 | - | mutation in isolated RNase H domain, mutant fails to bind RNA/DNA hybrids. Structure of mutant is similar to wild-type | 698692 |
| H539N | Human immunodeficiency virus 1 | - | increases the 3'-azido-3'-deoxythymidine concentration needed to inhibit viral replication by 50% 180fold relative to wild-type by increasing the time available for excision of incorporated nucleoside reverse transcriptase inhibitors from terminated primers | 700927 |
| I505A | Human immunodeficiency virus 1 | - | no discernible effect on viral titer | 701025 |
| I505A | Human immunodeficiency virus 1 | - | naturally occuring mutation in HIV infection patients, the mutation increases zidovudine resistance and decreased reverse trancriptase template switching | 716993 |
| I505G | Human immunodeficiency virus 1 | - | site-directed mutagenesis, the mutant exhibits a dimerization defect. The efficiency with which most mutants catalyzed polymerization-independent RNase H cleavage is sharply reduced. This deficiency is more pronounced when the mutant enzyme is challenged to process the (+) strand polypurine tract (PPT) primer from either (+) RNA or a PPT/(+) DNA RNA/DNA chimera | 650155 |
| K103N | Human immunodeficiency virus 1 | - | site-directed mutagenesis, the mutation does not affect RNase H function | 714972 |
| K103N | Human immunodeficiency virus 1 | - | a classic NNRTI resistance mutation | 715532 |
| K103N | Human immunodeficiency virus 1 | - | site-directed mutagenesis, the mutant virus shows fitness similar to that of the wild-type virus | 716067 |
| K103N | Human immunodeficiency virus 1 | - | mutation involved in non-nucleoside reverse transcriptase inhibitor resistance | 716994 |
| K219E | Human immunodeficiency virus 1 | - | thymidine analogue mutation, TAMs, arising with zidovudine and stavudine treatment, take the TAM-2 pathway | 716993 |
| K219N | Human immunodeficiency virus 1 | - | thymidine analogue mutation, TAMs, arising with zidovudine and stavudine treatment, take the TAM-2 pathway | 716993 |
| K219Q | Human immunodeficiency virus 1 | - | thymidine analogue mutation, TAMs, arising with zidovudine and stavudine treatment, take the TAM-2 pathway | 716993 |
| K219Q | Human immunodeficiency virus 1 | - | mutation involved in zidovudine resistance | 716994 |
| K390A | Human immunodeficiency virus 1 | - | naturally occuring mutation in HIV infection patients, the mutation increases zidovudine resistance and decreased reverse trancriptase template switching | 716993 |
| K395A | Human immunodeficiency virus 1 | - | naturally occuring mutation in HIV infection patients, the mutation increases zidovudine resistance and decreased reverse trancriptase template switching | 716993 |
| K451R | Human immunodeficiency virus 1 | - | mutation present in viral isolates of 11% of antiviral treatment-experienced patients but remaining 100% conserved among treatment-naive patients | 695644 |
| K476A | Human immunodeficiency virus 1 | - | site-directed mutagenesis, the mutant shows only minimally altered substrate specificity or enzyme activity compared to the wild-type enzyme. But the efficiency with which most mutants catalyzed polymerization-independent RNase H cleavage is sharply reduced. This deficiency is more pronounced when the mutant enzyme is challenged to process the (+) strand polypurine tract (PPT) primer from either (+) RNA or a PPT/(+) DNA RNA/DNA chimera | 650155 |
| K476A | Human immunodeficiency virus 1 | - | mutation reduces the viral titer less than 2fold | 701025 |
| K476A | Human immunodeficiency virus 1 | - | naturally occuring mutation in HIV infection patients, the mutation increases zidovudine resistance and decreased reverse trancriptase template switching | 716993 |
| K558E | Human immunodeficiency virus 1 | - | naturally occuring mutation in HIV infection patients, the mutation renders the patient more prevalent amongst treatment-experienced patients, associated with an increase in thymidine analogue mutations, treatment with nucleoside reverse transcriptase inhibitors and nonnucleoside reverse transcriptase inhibitors | 716993 |
| K558G | Human immunodeficiency virus 1 | - | naturally occuring mutation in HIV infection patients, the mutation renders the patient more prevalent amongst treatment-experienced patients, associated with an increase in thymidine analogue mutations, treatment with nucleoside reverse transcriptase inhibitors and nonnucleoside reverse transcriptase inhibitors | 716993 |
| K558R | Human immunodeficiency virus 1 | - | naturally occuring mutation in HIV infection patients, the mutation renders the patient more prevalent amongst treatment-experienced patients, associated with an increase in thymidine analogue mutations, treatment with nucleoside reverse transcriptase inhibitors and nonnucleoside reverse transcriptase inhibitors | 716993 |
| K65R | Human immunodeficiency virus 1 | - | naturally occuring mutation in HIV infection patients, arises with abacavir, didanosine, emtricitabine, lamivudine, or tenofovir disoproxil fumarate treatment | 716993 |
| K65R | Human immunodeficiency virus 1 | - | mutation involved in nucleos(t)ide reverse transcriptase inhibitor resistance | 716994 |
| K65R/Q151M/A62V/V75I/F77L/F116Y | Human immunodeficiency virus 1 | - | mutation involved in nucleos(t)ide reverse transcriptase inhibitor resistance | 716994 |
| K70R | Human immunodeficiency virus 1 | - | naturally occuring mutation in HIV infection patients, is common to stavudine, tenofovir disoproxil fumarate, and zidovudine therapy; thymidine analogue mutation, TAMs, arising with zidovudine and stavudine treatment, take the TAM-2 pathway | 716993 |
| K70R | Human immunodeficiency virus 1 | - | mutation involved in zidovudine resistance | 716994 |
| L100I | Human immunodeficiency virus 1 | - | mutation involved in non-nucleoside reverse transcriptase inhibitor resistance | 716994 |
| L210W | Human immunodeficiency virus 1 | - | thymidine analogue mutation, TAMs, arising with zidovudine and stavudine treatment, take the TAM-1 pathway | 716993 |
| L210W | Human immunodeficiency virus 1 | - | mutation involved in zidovudine resistance | 716994 |
| L469H | Human immunodeficiency virus 1 | - | naturally occuring mutation in HIV infection patients, the mutation renders the patient more prevalent amongst treatment-experienced patients, treatment with nucleoside reverse transcriptase inhibitors and nonnucleoside reverse transcriptase inhibitors | 716993 |
| L469I | Human immunodeficiency virus 1 | - | naturally occuring mutation in HIV infection patients, the mutation renders the patient more prevalent amongst treatment-experienced patients, treatment with nucleoside reverse transcriptase inhibitors and nonnucleoside reverse transcriptase inhibitors | 716993 |
| L469M | Human immunodeficiency virus 1 | - | naturally occuring mutation in HIV infection patients, the mutation renders the patient more prevalent amongst treatment-experienced patients, treatment with nucleoside reverse transcriptase inhibitors and nonnucleoside reverse transcriptase inhibitors | 716993 |
| L469T | Human immunodeficiency virus 1 | - | naturally occuring mutation in HIV infection patients, the mutation renders the patient more prevalent amongst treatment-experienced patients, treatment with nucleoside reverse transcriptase inhibitors and nonnucleoside reverse transcriptase inhibitors | 716993 |
| L74V | Human immunodeficiency virus 1 | - | mutation involved in nucleos(t)ide reverse transcriptase inhibitor resistance | 716994 |
| M184V | Human immunodeficiency virus 1 | - | naturally occuring mutation in HIV infection patients, arises with abacavir, emtricitabine, or lamivudine treatment | 716993 |
| M230L | Human immunodeficiency virus 1 | - | the naturally occuring mutation leads to reduced RNase H activity of the HIV reverse transcriptase | 713770 |
| M41L | Human immunodeficiency virus 1 | - | thymidine analogue mutation, TAMs, arising with zidovudine and stavudine treatment, take the TAM-1 pathway | 716993 |
| N348I | Human immunodeficiency virus 1 | - | mutations N348I, A376S and Q509L do confer varying amounts of nevirapine resistance by themselves, even in the absence of excision-enhancing mutations | 707178 |
| N348I | Human immunodeficiency virus 1 | - | connection domain mutant, altered RNase H cleavage pattern compared to the wild-type HIV-1 RT | 715532 |
| N348I | Human immunodeficiency virus 1 | - | mutation in the connection domain, the mutation significantly contributes to zidovudine resistance | 716993 |
| N348I | Human immunodeficiency virus 1 | - | naturally occuring mutant from clinical isolates, a connection/RNase H domain mutant that shows reduced RNase H activity | 716995 |
| N474A | Human immunodeficiency virus 1 | - | mutation reduces the viral titer less than 2fold | 701025 |
| N474A/Q475A | Human immunodeficiency virus 1 | - | mutation reduces the viral titer 5- to 10fold, , reduction in the efficiency of DNA synthesis. Mutant is less efficient than the wild-type enzyme in its ability to remove a polypurine tract primer from a model substrate and has an altered RNase H cleavage specificity | 701025 |
| N494D | Human immunodeficiency virus 1 | - | mutant closely resembles the wild-type RNase H, exhibits an endonuclease activity and a processive RNase H activity, gives rise to small RNA hydrolysis products, and acts in concert with the reverse transcriptase | 698694 |
| P236L | Human immunodeficiency virus 1 | - | site-directed mutagenesis, the mutant virus shows substantially reduced fitness compared to that of the wild-type virus | 716067 |
| P537Stop | Human immunodeficiency virus 1 | - | C-terminal truncation of p66 polypeptide. Loss of RNase H activity, while dimerization with polypepitde p51 and DNA polymerase activity are not significantly affected | 698701 |
| Q151M | Human immunodeficiency virus 1 | - | mutation involved in nucleos(t)ide reverse transcriptase inhibitor resistance | 716994 |
| Q151M/A62V/V75I/F77L/F116Y | Human immunodeficiency virus 1 | - | mutation involved in nucleos(t)ide reverse transcriptase inhibitor resistance | 716994 |
| Q475A | Human immunodeficiency virus 1 | - | mutation reduces the viral titer 5- to 10fold | 701025 |
| Q475A | Human immunodeficiency virus 1 | - | naturally occuring mutation in HIV infection patients, the mutation increases zidovudine resistance and decreased reverse trancriptase template switching | 716993 |
| Q475E | Human immunodeficiency virus 1 | - | mutant exhibits a retarded endonuclease activity and an impaired 3'-5' processive RNA cleavage activity, gives rise to predominantly larger RNA hydrolysis products, is less processive in the presence of competitor substrate, and is defective in its ability to hydrolyze the polypurine tract and homopolymeric hybrids | 698694 |
| Q500A | Human immunodeficiency virus 1 | - | mutation reduces the viral titer less than 2-fold | 701025 |
| Q509L | Human immunodeficiency virus 1 | - | mutations N348I, A376S and Q509L do confer varying amounts of nevirapine resistance by themselves, even in the absence of excision-enhancing mutations | 707178 |
| Q509L | Human immunodeficiency virus 1 | - | mutation in the RNase H domain, the mutation significantly contributes to zidovudine resistance | 716993 |
| Q509L | Human immunodeficiency virus 1 | - | site-directed mutagenesis, a connection/RNase H domain mutant | 716995 |
| R448A | Human immunodeficiency virus 1 | - | no discernible effect on viral titer | 701025 |
| T215F | Human immunodeficiency virus 1 | - | thymidine analogue mutation, TAMs, arising with zidovudine and stavudine treatment, take the TAM-2 pathway | 716993 |
| T215F | Human immunodeficiency virus 1 | - | mutation involved in zidovudine resistance | 716994 |
| T215Y | Human immunodeficiency virus 1 | - | thymidine analogue mutation, TAMs, arising with zidovudine and stavudine treatment, take the TAM-1 pathway | 716993 |
| T215Y | Human immunodeficiency virus 1 | - | mutation involved in zidovudine resistance | 716994 |
| T369I | Human immunodeficiency virus 1 | - | mutation in the connection domain | 716993 |
| T470E | Human immunodeficiency virus 1 | - | naturally occuring mutation in HIV infection patients, the mutation renders the patient more prevalent amongst treatment-experienced patients, treatment with nucleoside reverse transcriptase inhibitors and nonnucleoside reverse transcriptase inhibitors | 716993 |
| T470K | Human immunodeficiency virus 1 | - | naturally occuring mutation in HIV infection patients, the mutation renders the patient more prevalent amongst treatment-experienced patients, treatment with nucleoside reverse transcriptase inhibitors and nonnucleoside reverse transcriptase inhibitors | 716993 |
| T470P | Human immunodeficiency virus 1 | - | naturally occuring mutation in HIV infection patients, the mutation renders the patient more prevalent amongst treatment-experienced patients, treatment with nucleoside reverse transcriptase inhibitors and nonnucleoside reverse transcriptase inhibitors | 716993 |
| T470S | Human immunodeficiency virus 1 | - | naturally occuring mutation in HIV infection patients, the mutation renders the patient more prevalent amongst treatment-experienced patients, treatment with nucleoside reverse transcriptase inhibitors and nonnucleoside reverse transcriptase inhibitors | 716993 |
| T473A | Human immunodeficiency virus 1 | - | site-directed mutagenesis, the mutant shows only minimally altered substrate specificity or enzyme activity compared to the wild-type enzyme. But the efficiency with which most mutants catalyzed polymerization-independent RNase H cleavage is sharply reduced. This deficiency is more pronounced when the mutant enzyme is challenged to process the (+) strand polypurine tract (PPT) primer from either (+) RNA or a PPT/(+) DNA RNA/DNA chimera | 650155 |
| T473A | Human immunodeficiency virus 1 | - | mutation abolishes viral replication | 701025 |
| T473C | Human immunodeficiency virus 1 | - | the mutation increases the sensitivity of the enzyme for inhibitor NSC727447 by 50fold | 716995 |
| T473M | Human immunodeficiency virus 1 | - | naturally occuring mutation in HIV infection patients, the mutation increases zidovudine resistance and decreased reverse trancriptase template switching | 716993 |
| V106A | Human immunodeficiency virus 1 | - | site-directed mutagenesis, the mutant virus shows moderately reduced fitness compared to that of the wild-type virus | 716067 |
| V106A | Human immunodeficiency virus 1 | - | mutation involved in non-nucleoside reverse transcriptase inhibitor resistance | 716994 |
| V365I | Human immunodeficiency virus 1 | - | the E312Q, G333E, G335D, V365I, A371V and A376S substitutions in RNase H subdomain of HIV-1 reverse transcriptase are present in 26% of subtype B | 707178 |
| V365I | Human immunodeficiency virus 1 | - | mutation in the connection domain, the mutation significantly contributes to zidovudine resistance | 716993 |
| V552Stop | Human immunodeficiency virus 1 | - | C-terminal truncation of p66 polypeptide. Mutant retains endonuclease activity but lacks the directional processing feature of wild-type and barely supports transfer of nascent (-)-stranded DNA between RNA templates | 698701 |
| W229F | Human immunodeficiency virus 1 | - | mutation in primer grip residue, specificity of cleavage is not compromised, efficiency is reduced to 33-44% of wild-type | 696189 |
| W229F/Y232W | Human immunodeficiency virus 1 | - | mutation in primer grip residues, specificity of cleavage is not compromised, efficiency is reduced to 33-44% of wild-type | 696189 |
| W229Y | Human immunodeficiency virus 1 | - | mutation in primer grip residue, specificity of cleavage is not compromised, efficiency is reduced to 33-44% of wild-type | 696189 |
| W88G | Human immunodeficiency virus 1 | - | mutation involved in foscarnet resistance | 716994 |
| Y181C | Human immunodeficiency virus 1 | - | site-directed mutagenesis, the mutation does not affect RNase H function | 714972 |
| Y181C | Human immunodeficiency virus 1 | - | a classic NNRTI resistance mutation | 715532 |
| Y181C | Human immunodeficiency virus 1 | - | site-directed mutagenesis, the mutant virus shows fitness similar to that of the wild-type virus | 716067 |
| Y181C | Human immunodeficiency virus 1 | - | mutation involved in non-nucleoside reverse transcriptase inhibitor resistance | 716994 |
| Y181C | Human immunodeficiency virus 1 | - | site-directed mutagenesis, the mutant shows resistance to non-nucleoside reverse transcriptase inhibitors | 716995 |
| Y188C | Human immunodeficiency virus 1 | - | mutation involved in non-nucleoside reverse transcriptase inhibitor resistance | 716994 |
| Y188L | Human immunodeficiency virus 1 | - | mutation involved in non-nucleoside reverse transcriptase inhibitor resistance | 716994 |
| Y229F/Y232F | Human immunodeficiency virus 1 | - | mutation in primer grip residues, specificity of cleavage is not compromised, efficiency is reduced to 33-44% of wild-type | 696189 |
| Y232W | Human immunodeficiency virus 1 | - | mutation in primer grip residue, specificity of cleavage is not compromised, efficiency is reduced to 33-44% of wild-type | 696189 |
| Y318F | Human immunodeficiency virus 1 | - | mutation in the connection domain | 716993 |
| Y501A | Human immunodeficiency virus 1 | - | site-directed mutagenesis, the mutant shows only minimally altered substrate specificity or enzyme activity compared to the wild-type enzyme. But the efficiency with which most mutants catalyzed polymerization-independent RNase H cleavage is sharply reduced. This deficiency is more pronounced when the mutant enzyme is challenged to process the (+) strand polypurine tract (PPT) primer from either (+) RNA or a PPT/(+) DNA RNA/DNA chimera | 650155 |
| Y501A | Human immunodeficiency virus 1 | - | mutation reduces the viral titer 5- to 10fold, reduction in the efficiency of DNA synthesis. Mutant is less efficient than the wild-type enzyme in its ability to remove a polypurine tract primer from a model substrate and has an altered RNase H cleavage specificity | 701025 |
| Q294P | Human immunodeficiency virus 2 | - | site-directed mutagenesis of a residue in the catalytically inactive p54 subunit resulting in an increase in RNase H activity comparable with that of HIV-1 reverse transcriptase | 716995 |
| A128T | Moloney murine leukemia virus | - | the mutant strain is resistant to 2-hydroxyisoquinoline-1,3(2H,4H)-dione inhibitors in contrast to the wild-type | 715859 |
| C635V | Moloney murine leukemia virus | - | site-directed mutagenesis, the mutant shows slightly reduced reverse transcriptase and RNAse H activities compared the wild-type enzyme | 716354 |
| D524A | Moloney murine leukemia virus | - | mutant lacks RNase H activity, but retains reverse transcriptase activity. Elimination of RNase H activity enhances the intrinsic thermal stability of the protein rather than its affinity to template-primer; site-directed mutagenesis, RNase H-inactive mutant, that shows increased intrinsic thermal stability compared to the wild-type enzyme. The mutant loses RNase H activity through abolishing of Mg2+ binding to the RNase H domain | 707794 |
| D524N | Moloney murine leukemia virus | - | loss of catalytic activity. Construction of vectors encapsidated in virions engineered to contain phenotypic mixtures of wild-type and RNase H catalytic site point mutant D524N reverse transcriptase. There is a steady decline in direct repeat deletion frequency that correlates with decreases in functional RNase H, with greater than fourfold decreases in repeat deletion frequency observed when 95% of virion reverse transcriptase is RNase H defective | 699895 |
| D524N | Moloney murine leukemia virus | - | less than 0.5% of wild-type activity, no binding of Mn2+ | 701049 |
| D583A | Moloney murine leukemia virus | - | site-directed mutagenesis, RNase H-inactive mutant, that shows increased intrinsic thermal stability compared to the wild-type enzyme. The mutant loses RNase H activity through abolishing of Mg2+ binding to the RNase H domain | 707794 |
| D583N | Moloney murine leukemia virus | - | less than 0.5% of wild-type activity, no binding of Mn2+ | 701049 |
| D653N | Moloney murine leukemia virus | - | 4% of wild-type activity | 701049 |
| E562Q | Moloney murine leukemia virus | - | less than 0.5% of wild-type activity, no binding of Mn2+ | 701049 |
| G140S/Q148H | Moloney murine leukemia virus | - | the mutant strain is resistant to 2-hydroxyisoquinoline-1,3(2H,4H)-dione inhibitors in contrast to the wild-type | 715859 |
| D358N | Saccharomyces cerevisiae | - | mutation eliminates Mg2+- and Mn2+-dependent RNase H function | 652277 |
| D426N | Saccharomyces cerevisiae | - | mutation eliminates Mg2+- and Mn2+-dependent RNase H function | 652277 |
| D469N | Saccharomyces cerevisiae | - | reduced RNase H activity in presence of Mg2+, decrease of turnover rate in presence of Mn2+. Mutant fails to support DNA strand transfer and release of the (+)-strand polypurine tract primer from (+)-RNA | 652277 |
| E401Q | Saccharomyces cerevisiae | - | mutation eliminates Mg2+- and Mn2+-dependent RNase H function | 652277 |
| H427A | Saccharomyces cerevisiae | - | reduced RNase H activity in presence of Mg2+, decrease of turnover rate in presence of Mn2+. Mutant fails to support DNA strand transfer and release of the (+)-strand polypurine tract primer from (+)-RNA | 652277 |
| Y459A | Saccharomyces cerevisiae | - | reduced RNase H activity in presence of Mg2+, decrease of turnover rate in presence of Mn2+. Mutant fails to support DNA strand transfer and release of the (+)-strand polypurine tract primer from (+)-RNA | 652277 |
| M41L | Human immunodeficiency virus 1 | - | mutation involved in zidovudine resistance | 716994 |
| additional information | Human immunodeficiency virus 1 | - | RNase H primer grip mutations suppress polymerization-independent RNase H cleavage. Alteration of RNase H primer grip residues Thr473, Asn474, and Gln475 has little influence on cleavage specificity. Altering the RNase H domain of HIV-1 RT can impact significantly on the ability of mutant enzymes to catalyze DNA synthesis, but all RNase H primer grip mutants show little difference in their DNA-dependent DNA polymerase activity | 650155 |
| additional information | Human immunodeficiency virus 1 | - | construction of chimeric HIV-1/HIV-2 reverse transcriptases, in which protein segments and/or subunits are exchanged. The RNase H specific activity of the chimeric enzymes is either high like HIV-1 reverse transcriptase or low like HIV-2 reverse transcriptase. The origin of the thumb subdomain in the small subunit of the chimeric reverse transcriptases, residues 244-322 determines the level of the RNase H activity | 652865 |
| additional information | Human immunodeficiency virus 1 | - | chemical modifications by thiol-specific reagents of cysteine 280, located in a helix I in the thumb subdomain of the polymerase domain, affect substantially only the RNase H activity | 652907 |
| additional information | Human immunodeficiency virus 1 | - | construction of two chimeric enzymes by swapping the RNase H domains between HIV-1 RT and Moloney murine leukemia virus MuLV RT. Chimeric HIV-1 RT, having the RNase H domain of MuLV RT, inherits the divalent cation preference characteristic of MuLV RT on the DNA template with no significant change on the RNA template. Chimeric MuLV RT, likewise partially inherits the metal ion preference of HIV-1 RT. Unlike the wild-type MuLV RT, chimeric MuLV RT is able to use both Mn-dNTP and Mg-dNTP on the RNA template with similar efficiency, while a 30-fold higher preference for Mn.dNTP was seen on the DNA template. The metal preferences for the RNase H activity of chimeric HIV-1 RT and chimeric MuLV RT are, respectively, Mn2+ and Mg2+, a property acquired through their swapped RNase H domains. Chimeric HIV-1 RT displays higher fidelity and discrimination against rNTPs than against dNTPs substrates, a property inherited from MuLV RT. The overall fidelity of the chimeric MuLV RT is decreased in comparison to the parental MuLV RT, suggesting that the RNase H domain profoundly influences the function of the polymerase domain | 710674 |
| additional information | Human immunodeficiency virus 1 | - | construction of an N-terminally His-tagged mutant p51-G-TCR construct designed to encode the p51 subunit joined by a linker to the thumb (T), connection (C), and RNase H (R) domains of p66, the p51-G-TCR RNase H construct displays Mg2+-dependent activity using a fluorescent nonspecific assay and shows the same cleavage pattern as HIV-1 reverse transcriptase on substrates that mimic the tRNA removal required for second-strand transfer reactions. The RNase H of the p51-G-TCR RNase H construct and wild-type HIV-1 reverse transcriptase have similar Kms for an RNA-DNA hybrid substrate and show similar inhibition kinetics to two known inhibitors of the HIV-1 reverse transcriptase RNase H, molecular modeling | 713774 |
| Y501A | Human immunodeficiency virus 1 | - | naturally occuring mutation in HIV infection patients, the mutation increases zidovudine resistance and decreased reverse trancriptase template switching | 716993 |
| additional information | Human immunodeficiency virus 2 | - | construction of chimeric HIV-1/HIV-2 reverse transcriptases, in which protein segments and/or subunits are exchanged. The RNase H specific activity of the chimeric enzymes is either high like HIV-1 reverse transcriptase or low like HIV-2 reverse transcriptase. The origin of the thumb subdomain in the small subunit of the chimeric reverse transcriptases, residues 244-322 determines the level of the RNase H activity | 652865 |
| H638G | Moloney murine leukemia virus | - | 15% of wild-type activity | 701049 |
| additional information | Moloney murine leukemia virus | - | deletion of 204 nucleotides at the 3'-terminus results in 4fold increase in activity level upon recombinant expression and allows for high-level production of the protein | 643436 |
| additional information | Moloney murine leukemia virus | - | construction of two chimeric enzymes by swapping the RNase H domains between HIV-1 RT and Moloney murine leukemia virus MuLV RT. Chimeric HIV-1 RT, having the RNase H domain of MuLV RT, inherits the divalent cation preference characteristic of MuLV RT on the DNA template with no significant change on the RNA template. Chimeric MuLV RT, likewise partially inherits the metal ion preference of HIV-1 RT. Unlike the wild-type MuLV RT, chimeric MuLV RT is able to use both Mn-dNTP and Mg-dNTP on the RNA template with similar efficiency, while a 30-fold higher preference for Mn.dNTP was seen on the DNA template. The metal preferences for the RNase H activity of chimeric HIV-1 RT and chimeric MuLV RT are, respectively, Mn2+ and Mg2+, a property acquired through their swapped RNase H domains. Chimeric HIV-1 RT displays higher fidelity and discrimination against rNTPs than against dNTPs substrates, a property inherited from MuLV RT. The overall fidelity of the chimeric MuLV RT is decreased in comparison to the parental MuLV RT, suggesting that the RNase H domain profoundly influences the function of the polymerase domain | 710674 |
| additional information | Moloney murine leukemia virus | - | site-directed chemical modification of the RNase H domain by selectively PEGylating Cys635, one of the eight cysteine residues present in the reverse transcriptase, specifically inactivates its ribonucleolytic activity, PEGylation as a tool for engineering the M-MuLV RT derivative deficient in RNase H activity, overview | 716354 |
| additional information | murine leukemia virus | - | construction of a chimeric enzyme containing the first 425 amino acid residues from the N-terminal domain of HIV-1 reverse transcriptase, i.e. the polymerase domain, and 200 amino acid residues from the C-terminal domain of murine leukemia virus reverse transcriptase, i.e. RNase H-domain. The chimeric enzyme exists as a monomer with intact DNA polymerase and RNase-H functions. It is able to catalyze both endonucleolytic and processive RNase-H functions in a manner similar to the wild type HIV-1 reverse transcriptase and murineleukemia virus reverse transcriptase | 698711 |