Cloned (Comment) | Organism |
---|---|
gene MJ0438 or trm14, DNA and amino acid sequence determination, analysis and comparisons, phylogenetic analysis | Methanocaldococcus jannaschii |
KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|
additional information | - |
additional information | single-turnover, kinetic analysis, overview | Methanocaldococcus jannaschii |
Metals/Ions | Comment | Organism | Structure |
---|---|---|---|
Mg2+ | required | Methanocaldococcus jannaschii |
Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
---|---|---|---|---|---|---|
S-adenosyl-L-methionine + guanine6 in tRNACys | Methanocaldococcus jannaschii | Trm14 generates m2G at position 6 in tRNACys | S-adenosyl-L-homocysteine + N2-methylguanine6 in tRNACys | - |
? | |
S-adenosyl-L-methionine + guanine6 in tRNACys | Methanocaldococcus jannaschii JAL-1 | Trm14 generates m2G at position 6 in tRNACys | S-adenosyl-L-homocysteine + N2-methylguanine6 in tRNACys | - |
? |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Methanocaldococcus jannaschii | Q57880 | DSM 2661, gene MJ0438 or trm14 | - |
Methanocaldococcus jannaschii JAL-1 | Q57880 | DSM 2661, gene MJ0438 or trm14 | - |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
S-adenosyl-L-methionine + guanine6 in tRNACys | Trm14 generates m2G at position 6 in tRNACys | Methanocaldococcus jannaschii | S-adenosyl-L-homocysteine + N2-methylguanine6 in tRNACys | - |
? | |
S-adenosyl-L-methionine + guanine6 in tRNACys | wild-type or G6A/C67U tRNACys transcripts as substrates, Trm14 generates m2G at position 6 in tRNACys, i.e. tRNACys m2G6-forming activity | Methanocaldococcus jannaschii | S-adenosyl-L-homocysteine + N2-methylguanine6 in tRNACys | - |
? | |
S-adenosyl-L-methionine + guanine6 in tRNACys | Trm14 generates m2G at position 6 in tRNACys | Methanocaldococcus jannaschii JAL-1 | S-adenosyl-L-homocysteine + N2-methylguanine6 in tRNACys | - |
? | |
S-adenosyl-L-methionine + guanine6 in tRNACys | wild-type or G6A/C67U tRNACys transcripts as substrates, Trm14 generates m2G at position 6 in tRNACys, i.e. tRNACys m2G6-forming activity | Methanocaldococcus jannaschii JAL-1 | S-adenosyl-L-homocysteine + N2-methylguanine6 in tRNACys | - |
? |
Subunits | Comment | Organism |
---|---|---|
More | the 381 amino acid Trm14 protein possesses a canonical RNA recognition THUMP domain at the N-terminus, followed by a gamma-class Rossmann fold amino-methyltransferase catalytic domain featuring the signature NPPY active site motif | Methanocaldococcus jannaschii |
Synonyms | Comment | Organism |
---|---|---|
m2G6 tRNA methylase | - |
Methanocaldococcus jannaschii |
methyltransferase Trm14 | - |
Methanocaldococcus jannaschii |
Trm14 | - |
Methanocaldococcus jannaschii |
Temperature Optimum [°C] | Temperature Optimum Maximum [°C] | Comment | Organism |
---|---|---|---|
37 | - |
assay at | Methanocaldococcus jannaschii |
pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
---|---|---|---|
7.3 | - |
assay at | Methanocaldococcus jannaschii |
General Information | Comment | Organism |
---|---|---|
evolution | Trm14 is associated with cluster of orthologous groups, COG, 0116, and most closely resembles the m2G10 tRNA methylase Trm11. Phylogenetic analysis reveals a canonical archaeal/bacterial evolutionary separation with 20-30% sequence identities between the two branches, but it is likely that the detailed functions of COG 0116 enzymes differ between the archaeal and bacterial domains. Phylogenetic distribution of Trm14-like proteins, overview | Methanocaldococcus jannaschii |
physiological function | tRNA m2G6 formation may play a role in stabilizing the structure of the RNA and function synergistically with these core-region modifications to stabilize the molecule against thermal stress. Also, Trm14-catalyzed m2G6 formation in tRNACys may play a role in modulating the aminoacylation efficiency of phosphoseryl-tRNA synthetase, i.e. SepRS. Control of SepRS (or CysRS) activity by SAM-dependent methylation of tRNACys might provide the methanogen cell with a regulatory mechanism by which protein synthesis rates can respond to environmental sulfur levels or to concentrations of sulfur metabolites | Methanocaldococcus jannaschii |