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Information on EC 2.1.1.187 - 23S rRNA (guanine745-N1)-methyltransferase
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2.1.1.187 23S rRNA (guanine745-N1)-methyltransferaseIUBMB Comments
The enzyme specifically methylates guanine745 at N1 in 23S rRNA.
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The enzyme appears in viruses and cellular organisms
Reaction Schemes
+
=
+
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guanine745 in 23S rRNA
=
+
N1-methylguanine745 in 23S rRNA
Synonyms
rlma(i), rlmai, 23s rrna m1g745 methyltransferase, 
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SYNONYM 
ORGANISM
UNIPROT
COMMENTARY 
LITERATURE
RlmAI
rRNA large subunit methyltransferase I
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REACTION
REACTION DIAGRAM
COMMENTARY
ORGANISM
UNIPROT
LITERATURE
S-adenosyl-L-methionine + guanine745 in 23S rRNA = S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
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SYSTEMATIC NAME
IUBMB Comments
S-adenosyl-L-methionine:23S rRNA (guanine745-N1)-methyltransferase
The enzyme specifically methylates guanine745 at N1 in 23S rRNA.
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CAS REGISTRY NUMBER
COMMENTARY
50812-25-4
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SUBSTRATE
PRODUCT
REACTION DIAGRAM
ORGANISM
UNIPROT
COMMENTARY
(Substrate)
(Substrate)
LITERATURE
(Substrate)
(Substrate)
COMMENTARY
(Product)
(Product)
LITERATURE
(Product)
(Product)
Reversibility
r=reversible
ir=irreversible
?=not specified
r=reversible
ir=irreversible
?=not specified
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
Gram-negative 23 S rRNAs are methylated at G745. 23S rRNA of Gram-positives is methylated at G748. The position of an RNA methylation defines a sharp division between the Gram-negative and Gram-positive bacteria. Specificity of methylation is determined solely by the methyltransferase enzyme and is independent of the origin of the rRNA substrate
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-
?
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
Gram-negative 23 S rRNAs are methylated at G745. 23S rRNA of Gram-positives is methylated at G748. The position of an RNA methylation defines a sharp division between the Gram-negative and Gram-positive bacteria. Specificity of methylation is determined solely by the methyltransferase enzyme and is independent of the origin of the rRNA substrate. Azotobacter vinelandii shows intrinsic 23S rRNA methylation at G745. No methylation is determined with the recombinant protein in vivo or in vitro
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-
?
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
-
Gram-negative 23 S rRNAs are methylated at G745. 23S rRNA of Gram-positives is methylated at G748. The position of an RNA methylation defines a sharp division between the Gram-negative and Gram-positive bacteria. Specificity of methylation is determined solely by the methyltransferase enzyme and is independent of the origin of the rRNA substrate. Erwinia crysanthemi shows intrinsic 23S rRNA methylation at G745. No methylation is determined with the recombinant protein in vivo or in vitro
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-
?
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
-
-
-
-
?
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
Gram-negative 23 S rRNAs are methylated at G745. 23S rRNA of Gram-positives is methylated at G748. The position of an RNA methylation defines a sharp division between the Gram-negative and Gram-positive bacteria. Specificity of methylation is determined solely by the methyltransferase enzyme and is independent of the origin of the rRNA substrate
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-
?
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
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the methylation at guanine745 is confined to Gram-negative bacteria
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?
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
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methylated guanines are located in hairpin 35, in domain II of prokaryotic 23S rRNA. RrmA possesses two regions that may be responsible for specific interactions with their target nucleic acid sequences: a putative Zn-finger domain in the N-terminus and the variable domain close to the C-terminus, which indicates that the enzyme exhibits the primary structural organization distinct from other nucleic acid MTases, despite sharing the common catalytic domain
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S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
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methylation of the N1 position of nucleotide G745 in hairpin 35 of Escherichia coli 23S ribosomal RNA. Progressive truncation of the rRNA substrate shows that structures in stem-loops 33, 34 and 35 are required for methylation by RrmA. Multiple contacts between nucleotides in these stem-loops and RrmA are confirmed in footprinting experiments. No other RrmA contact is evident elsewhere in the rRNA. The RrmA contact sites on the rRNA are inaccessible in ribosomal particles and, consistent with this, 50S subunits or 70S ribosomes are not substrates for RrmA methylation. Methylate their target nucleotides only in the free RNA
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?
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
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Gram-negative 23 S rRNAs are methylated at G745. 23S rRNA of Gram-positives is methylated at G748. The position of an RNA methylation defines a sharp division between the Gram-negative and Gram-positive bacteria. Specificity of methylation is determined solely by the methyltransferase enzyme and is independent of the origin of the rRNA substrate. Enterobacter aerogenes shows intrinsic 23S rRNA methylation at G745. No methylation is determined with the recombinant protein in vivo or in vitro
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-
?
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
-
Gram-negative 23 S rRNAs are methylated at G745. 23S rRNA of Gram-positives is methylated at G748. The position of an RNA methylation defines a sharp division between the Gram-negative and Gram-positive bacteria. Specificity of methylation is determined solely by the methyltransferase enzyme and is independent of the origin of the rRNA substrate. Proteus mirabilis shows intrinsic 23S rRNA methylation at G745. No methylation is determined with the recombinant protein in vivo or in vitro
-
-
?
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
-
Gram-negative 23 S rRNAs are methylated at G745. 23S rRNA of Gram-positives is methylated at G748. The position of an RNA methylation defines a sharp division between the Gram-negative and Gram-positive bacteria. Specificity of methylation is determined solely by the methyltransferase enzyme and is independent of the origin of the rRNA substrate. Pseudomonas fluorescens shows intrinsic 23S rRNA methylation at G745. No methylation is determined with the recombinant protein in vivo or in vitro
-
-
?
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
-
Gram-negative 23 S rRNAs are methylated at G745. 23S rRNA of Gram-positives is methylated at G748. The position of an RNA methylation defines a sharp division between the Gram-negative and Gram-positive bacteria. Specificity of methylation is determined solely by the methyltransferase enzyme and is independent of the origin of the rRNA substrate. Pseudomonas putida shows intrinsic 23S rRNA methylation at G745. No methylation is determined with the recombinant protein in vivo or in vitro
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-
?
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
Gram-negative 23 S rRNAs are methylated at G745. 23S rRNA of Gram-positives is methylated at G748. The position of an RNA methylation defines a sharp division between the Gram-negative and Gram-positive bacteria. Specificity of methylation is determined solely by the methyltransferase enzyme and is independent of the origin of the rRNA substrate. Pseudomonas stutzeri shows intrinsic 23S rRNA methylation at G745. No methylation is determined with the recombinant protein in vivo or in vitro
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-
?
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
Gram-negative 23 S rRNAs are methylated at G745. 23S rRNA of Gram-positives is methylated at G748. The position of an RNA methylation defines a sharp division between the Gram-negative and Gram-positive bacteria. Specificity of methylation is determined solely by the methyltransferase enzyme and is independent of the origin of the rRNA substrate. Pseudomonas syringae shows intrinsic 23S rRNA methylation at G745. No methylation is determined with the recombinant protein in vivo or in vitro
-
-
?
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
-
Gram-negative 23 S rRNAs are methylated at G745. 23S rRNA of Gram-positives is methylated at G748. The position of an RNA methylation defines a sharp division between the Gram-negative and Gram-positive bacteria. Specificity of methylation is determined solely by the methyltransferase enzyme and is independent of the origin of the rRNA substrate
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-
?
Please wait a moment until the data is sorted. This message will disappear when the data is sorted.
NATURAL SUBSTRATE
NATURAL PRODUCT
REACTION DIAGRAM
ORGANISM
UNIPROT
COMMENTARY
(Substrate)
(Substrate)
LITERATURE
(Substrate)
(Substrate)
COMMENTARY
(Product)
(Product)
LITERATURE
(Product)
(Product)
REVERSIBILITY
r=reversible
ir=irreversible
?=not specified
r=reversible
ir=irreversible
?=not specified
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
Q9AEP4
Gram-negative 23 S rRNAs are methylated at G745. 23S rRNA of Gram-positives is methylated at G748. The position of an RNA methylation defines a sharp division between the Gram-negative and Gram-positive bacteria. Specificity of methylation is determined solely by the methyltransferase enzyme and is independent of the origin of the rRNA substrate
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-
?
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
C1DSW3
Gram-negative 23 S rRNAs are methylated at G745. 23S rRNA of Gram-positives is methylated at G748. The position of an RNA methylation defines a sharp division between the Gram-negative and Gram-positive bacteria. Specificity of methylation is determined solely by the methyltransferase enzyme and is independent of the origin of the rRNA substrate. Azotobacter vinelandii shows intrinsic 23S rRNA methylation at G745. No methylation is determined with the recombinant protein in vivo or in vitro
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-
?
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
-
Gram-negative 23 S rRNAs are methylated at G745. 23S rRNA of Gram-positives is methylated at G748. The position of an RNA methylation defines a sharp division between the Gram-negative and Gram-positive bacteria. Specificity of methylation is determined solely by the methyltransferase enzyme and is independent of the origin of the rRNA substrate. Erwinia crysanthemi shows intrinsic 23S rRNA methylation at G745. No methylation is determined with the recombinant protein in vivo or in vitro
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-
?
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
-
-
-
-
?
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
P36999
Gram-negative 23 S rRNAs are methylated at G745. 23S rRNA of Gram-positives is methylated at G748. The position of an RNA methylation defines a sharp division between the Gram-negative and Gram-positive bacteria. Specificity of methylation is determined solely by the methyltransferase enzyme and is independent of the origin of the rRNA substrate
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-
?
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
-
the methylation at guanine745 is confined to Gram-negative bacteria
-
-
?
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
-
Gram-negative 23 S rRNAs are methylated at G745. 23S rRNA of Gram-positives is methylated at G748. The position of an RNA methylation defines a sharp division between the Gram-negative and Gram-positive bacteria. Specificity of methylation is determined solely by the methyltransferase enzyme and is independent of the origin of the rRNA substrate. Enterobacter aerogenes shows intrinsic 23S rRNA methylation at G745. No methylation is determined with the recombinant protein in vivo or in vitro
-
-
?
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
-
Gram-negative 23 S rRNAs are methylated at G745. 23S rRNA of Gram-positives is methylated at G748. The position of an RNA methylation defines a sharp division between the Gram-negative and Gram-positive bacteria. Specificity of methylation is determined solely by the methyltransferase enzyme and is independent of the origin of the rRNA substrate. Proteus mirabilis shows intrinsic 23S rRNA methylation at G745. No methylation is determined with the recombinant protein in vivo or in vitro
-
-
?
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
-
Gram-negative 23 S rRNAs are methylated at G745. 23S rRNA of Gram-positives is methylated at G748. The position of an RNA methylation defines a sharp division between the Gram-negative and Gram-positive bacteria. Specificity of methylation is determined solely by the methyltransferase enzyme and is independent of the origin of the rRNA substrate. Pseudomonas fluorescens shows intrinsic 23S rRNA methylation at G745. No methylation is determined with the recombinant protein in vivo or in vitro
-
-
?
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
-
Gram-negative 23 S rRNAs are methylated at G745. 23S rRNA of Gram-positives is methylated at G748. The position of an RNA methylation defines a sharp division between the Gram-negative and Gram-positive bacteria. Specificity of methylation is determined solely by the methyltransferase enzyme and is independent of the origin of the rRNA substrate. Pseudomonas putida shows intrinsic 23S rRNA methylation at G745. No methylation is determined with the recombinant protein in vivo or in vitro
-
-
?
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
A4VMZ0
Gram-negative 23 S rRNAs are methylated at G745. 23S rRNA of Gram-positives is methylated at G748. The position of an RNA methylation defines a sharp division between the Gram-negative and Gram-positive bacteria. Specificity of methylation is determined solely by the methyltransferase enzyme and is independent of the origin of the rRNA substrate. Pseudomonas stutzeri shows intrinsic 23S rRNA methylation at G745. No methylation is determined with the recombinant protein in vivo or in vitro
-
-
?
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
Q48F48
Gram-negative 23 S rRNAs are methylated at G745. 23S rRNA of Gram-positives is methylated at G748. The position of an RNA methylation defines a sharp division between the Gram-negative and Gram-positive bacteria. Specificity of methylation is determined solely by the methyltransferase enzyme and is independent of the origin of the rRNA substrate. Pseudomonas syringae shows intrinsic 23S rRNA methylation at G745. No methylation is determined with the recombinant protein in vivo or in vitro
-
-
?
S-adenosyl-L-methionine + guanine745 in 23S rRNA
S-adenosyl-L-homocysteine + N1-methylguanine745 in 23S rRNA
-
Gram-negative 23 S rRNAs are methylated at G745. 23S rRNA of Gram-positives is methylated at G748. The position of an RNA methylation defines a sharp division between the Gram-negative and Gram-positive bacteria. Specificity of methylation is determined solely by the methyltransferase enzyme and is independent of the origin of the rRNA substrate
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-
?
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pH OPTIMUM
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
7.5
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TEMPERATURE OPTIMUM
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
37
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ORGANISM
COMMENTARY
LITERATURE
UNIPROT
SEQUENCE DB
SOURCE
comparative analysis of the RlmAI/RlmAII methyltransferase sequences. Gram-negative sequences align with RlmAI and the Gram-positives sequences with RlmAII
SwissProt
brenda
comparative analysis of the RlmAI/RlmAII methyltransferase sequences. Gram-negative sequences align with RlmAI and the Gram-positives sequences with RlmAII
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-
brenda
comparative analysis of the RlmAI/RlmAII methyltransferase sequences. Gram-negative sequences align with RlmAI and the Gram-positives sequences with RlmAII
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-
brenda
comparative analysis of the RlmAI/RlmAII methyltransferase sequences. Gram-negative sequences align with RlmAI and the Gram-positives sequences with RlmAII
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-
brenda
comparative analysis of the RlmAI/RlmAII methyltransferase sequences. Gram-negative sequences align with RlmAI and the Gram-positives sequences with RlmAII
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-
brenda
comparative analysis of the RlmAI/RlmAII methyltransferase sequences. Gram-negative sequences align with RlmAI and the Gram-positives sequences with RlmAII
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-
brenda
comparative analysis of the RlmAI/RlmAII methyltransferase sequences. Gram-negative sequences align with RlmAI and the Gram-positives sequences with RlmAII
UniProt
brenda
comparative analysis of the RlmAI/RlmAII methyltransferase sequences. Gram-negative sequences align with RlmAI and the Gram-positives sequences with RlmAII
UniProt
brenda
comparative analysis of the RlmAI/RlmAII methyltransferase sequences. Gram-negative sequences align with RlmAI and the Gram-positives sequences with RlmAII
-
-
brenda
comparative analysis of the RlmAI/RlmAII methyltransferase sequences. Gram-negative sequences align with RlmAI and the Gram-positives sequences with RlmAII
SwissProt
brenda
comparative analysis of the RlmAI/RlmAII methyltransferase sequences. Gram-negative sequences align with RlmAI and the Gram-positives sequences with RlmAII
SwissProt
brenda
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GENERAL INFORMATION
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
malfunction
malfunction
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lack of G745 methylation results in reduced rates of protein synthesis and growth. Addition of recombinant plasmid-encoded rrmA to an rrmA-defficient strain remedies these defects
malfunction
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mutant lacking N1-methylation of G745 exhibits increased resistance to viomycin in addition to severe defects of growth characteristics
malfunction
slow growth of the Acinetobacter rlmAI knockout. The growth defect of the Acinetobacter rlmAI knockout is lost during serial passaging of the strain on agar plates. None of the Acinetobacter or Escherichia coli cells tested has regained their ability to methylate G745, and all are thus pseudorevertants. The putative second-site mutations are possibly not rescuing the lack of G745 methylation, but are perhaps compensating for some other function of RlmAI. Cell growth is not dependent on G745 methylation, and the RlmAI methyltransferase therefore has another primary function
malfunction
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a mutant deficient in N1-methylguanine745 modification shows a 40% decreased growth rate in rich media, a drastic reduction in loosely coupled ribosomes, a 20% decreased polypeptide chain elongation rate, and increased resistance to the ribosome binding antibiotic viomycin
Show AA Sequence and Transmembrane Helices (877 entries)
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MOLECULAR WEIGHT
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
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SUBUNIT
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
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CRYSTALLIZATION/commentary
ORGANISM
UNIPROT
LITERATURE
hanging drop vapor diffusion techniques at 22°C, crystal structure of RlmAI at 2.8 A resolution. The crystal structure of RlmAI has a well defined and largely positively charged W-shaped RNA-binding cleft formed by asymmetric dimerization
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PURIFICATION/commentary
ORGANISM
UNIPROT
LITERATURE
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CLONED/commentary
ORGANISM
UNIPROT
LITERATURE
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REF.
AUTHORS
TITLE
JOURNAL
VOL.
PAGES
YEAR
ORGANISM (UNIPROT)
PUBMED ID
SOURCE
Isaksson, L.A.
Partial purification of ribosomal RNA(m1G)- and rRNA(m2G)-methylases from Escherichia coli and demonstration of some proteins affecting their apparent activity
Biochim. Biophys. Acta
312
122-133
1973
Escherichia coli (P36999)
brenda
Hansen, L.H.; Kirpekar, F.; Douthwaite, S.
Recognition of nucleotide G745 in 23 S ribosomal RNA by the RrmA methyltransferase
J. Mol. Biol.
310
1001-1010
2001
Escherichia coli (P36999)
brenda
Liu, M.; Douthwaite, S.
Methylation at nucleotide G745 or G748 in 23S rRNA distinguishes gram-negative from gram-positive bacteria
Mol. Microbiol.
44
195-204
2002
Acinetobacter sp. (Q9AEP4), Azotobacter vinelandii (C1DSW3), Dickeya chrysanthemi, Escherichia coli, Escherichia coli (P36999), Klebsiella aerogenes, Proteus mirabilis, Pseudomonas fluorescens, Pseudomonas putida, Pseudomonas stutzeri (A4VMZ0), Pseudomonas syringae (Q48F48), Shewanella putrefaciens
brenda
Bujnicki, J.M.; Blumenthal, R.M.; Rychlewski, L.
Sequence analysis and structure prediction of 23S rRNA:m1G methyltransferases reveals a conserved core augmented with a putative Zn-binding domain in the N-terminus and family-specific elaborations in the C-terminus
J. Mol. Microbiol. Biotechnol.
4
93-99
2002
Escherichia coli (P36999)
brenda
Das, K.; Acton, T.; Chiang, Y.; Shih, L.; Arnold, E.; Montelione, G.T.
Crystal structure of RlmAI: implications for understanding the 23S rRNA G745/G748-methylation at the macrolide antibiotic-binding site
Proc. Natl. Acad. Sci. USA
101
4041-4046
2004
Escherichia coli, Escherichia coli (P36999)
brenda
Liu, M.; Novotny, G.W.; Douthwaite, S.
Methylation of 23S rRNA nucleotide G745 is a secondary function of the RlmAI methyltransferase
RNA
10
1713-1720
2004
Acinetobacter sp. (Q9AEP4)
brenda
Gustafsson, C.; Persson, B.C.
Identification of the rrmA gene encoding the 23S rRNA m1G745 methyltransferase in Escherichia coli and characterization of an m1G745-deficient mutant
J. Bacteriol.
180
359-365
1998
Escherichia coli, Escherichia coli (P36999)
brenda
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