Crystal structure of a putative methyltransferase SAV1081 from staphylococcus aureus

Shunsuke Kita, Yoshikazu Tanaka, Nagisa Hirano, Satoshi Kimura, Takeo Suzuki, Tsutomu Suzuki, Min Yao, Isao Tanaka

Research output: Contribution to journalArticlepeer-review


Cluster of Orthologous Groups (COG) 1092 contains two distinct types of methylation enzyme from Escherichia coli, YccW and YcbY. YccW is a 5-methylcytosine methyltransferase (m5C MTase) responsible for m 5C 1962 in 23S rRNA, whereas YcbY is a dimethyltransferase, of which N- and C-terminal domains are responsible for N2- methylguanosine (m2G) 2445 and 7-methylguanosine (m7G) 2069 in 23S rRNA, respectively. However, proteins in COG1092 other than YccW and YcbY remain functionally unidentified. SAV1081 from Staphylococcus aureus is one of the functionally unassigned proteins of COG1092. Although SAV1081 has an identical domain organization to YccW with 26% sequence identity, it lacks the catalytic cysteine residue essential for m5C formation activity. In the present study, we determined the crystal structure of SAV1081 and compared it with those of other COG1092 proteins. Based on the structure characteristics, such as the presence or absence of the catalytic cysteine residue, β-hairpin structure, and oligomeric state, as well as domain organization, we propose a functional classification of COG1092 proteins.

Original languageEnglish
Pages (from-to)530-537
Number of pages8
JournalProtein and Peptide Letters
Issue number5
Publication statusPublished - 2013 May
Externally publishedYes


  • Cog1092
  • Methylation
  • Rna modification
  • Sav1081
  • Ycby
  • Yccw

ASJC Scopus subject areas

  • Structural Biology
  • Biochemistry


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