4DCM

Crystal Structure of methyltransferase RlmG modifying G1835 of 23S rRNA in Escherichia coli


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.297 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.201 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural insights into the function of 23S rRNA methyltransferase RlmG (m2G1835) from Escherichia coli.

Zhang, H.Gao, Z.Q.Wei, Y.Wang, W.J.Liu, G.F.Shtykova, E.V.Xu, J.H.Dong, Y.H.

(2012) Rna 18: 1500-1509

  • DOI: 10.1261/rna.033407.112

  • PubMed Abstract: 
  • RlmG is a specific AdoMet-dependent methyltransferase (MTase) responsible for N²-methylation of G1835 in 23S rRNA of Escherichia coli. Methylation of m²G1835 specifically enhances association of ribosomal subunits and provides a significant advantage ...

    RlmG is a specific AdoMet-dependent methyltransferase (MTase) responsible for N²-methylation of G1835 in 23S rRNA of Escherichia coli. Methylation of m²G1835 specifically enhances association of ribosomal subunits and provides a significant advantage for bacteria in osmotic and oxidative stress. Here, the crystal structure of RlmG in complex with AdoMet and its structure in solution were determined. The structure of RlmG is similar to that of the MTase RsmC, consisting of two homologous domains: the N-terminal domain (NTD) in the recognition and binding of the substrate, and the C-terminal domain (CTD) in AdoMet-binding and the catalytic process. However, there are distinct positively charged protuberances and a distribution of conserved residues contributing to the charged surface patch, especially in the NTD of RlmG for direct binding of protein-free rRNA. The RNA-binding properties of the NTD and CTD characterized by both gel electrophoresis mobility shift assays and isothermal titration calorimetry showed that NTD could bind RNA independently and RNA binding was achieved by the NTD, accomplished by a coordinating role of the CTD. The model of the RlmG-AdoMet-RNA complex suggested that RlmG may unfold its substrate RNA in the positively charged cleft between the NTD and CTD, and then G1835 disengages from its Watson-Crick pairing with C1905 and flips out to insert into the active site. Our structure and biochemical studies provide novel insights into the catalytic mechanism of G1835 methylation.


    Organizational Affiliation

    Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ribosomal RNA large subunit methyltransferase G
A
375Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: rlmG (ygjO)
EC: 2.1.1.174
Find proteins for P42596 (Escherichia coli (strain K12))
Go to UniProtKB:  P42596
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PEG
Query on PEG

Download SDF File 
Download CCD File 
A
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
 Ligand Interaction
SAM
Query on SAM

Download SDF File 
Download CCD File 
A
S-ADENOSYLMETHIONINE
C15 H22 N6 O5 S
MEFKEPWMEQBLKI-FCKMPRQPSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.297 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.201 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 67.185α = 90.00
b = 42.134β = 104.46
c = 72.429γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
MAR345data collection
PHENIXrefinement
SOLVEphasing
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-08-01
    Type: Initial release
  • Version 1.1: 2017-11-15
    Type: Refinement description