3E0M

Crystal structure of fusion protein of MsrA and MsrB


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.239 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural and Kinetic Analysis of an MsrA-MsrB Fusion Protein from Streptococcus pneumoniae

Kim, Y.K.Shin, Y.J.Lee, W.-H.Kim, H.-Y.Hwang, K.Y.

(2009) Mol.Microbiol. 72: 699-709

  • DOI: 10.1111/j.1365-2958.2009.06680.x
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Methionine sulphoxide reductases (Msr) catalyse the reduction of oxidized methionine to methionine. These enzymes are divided into two classes, MsrA and MsrB, according to substrate specificity. Although most MsrA and MsrB exist as separate enzymes, ...

    Methionine sulphoxide reductases (Msr) catalyse the reduction of oxidized methionine to methionine. These enzymes are divided into two classes, MsrA and MsrB, according to substrate specificity. Although most MsrA and MsrB exist as separate enzymes, in some bacteria these two enzymes are fused to form a single polypeptide (MsrAB). Here, we report the first crystal structure of MsrAB from Streptococcus pneumoniae (SpMsrAB) at 2.4 A resolution. SpMsrAB consists of an N-terminal MsrA domain, a C-terminal MsrB domain and a linker. The linker is composed of 13 residues and contains one 3(10)-helix and several hydrogen bonds interacting with both MsrA and MsrB domains. Interestingly, our structure includes the MsrB domain complexed with an SHMAEI hexa-peptide that is the N-terminal region of neighbouring MsrA domain. A kinetic analysis showed that the apparent K(m) of SpMsrAB for the R-form-substrate was 20-fold lower than that for the S-form substrate, indicating that the MsrB domain had a much higher affinity for the substrate than the MsrA domain. Our study reveals the first structure of the MsrAB by providing insights into the formation of a disulphide bridge in the MsrB, the structure of the linker region, and the distinct structural nature of active site of each MsrA and MsrB domain.


    Organizational Affiliation

    Division of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul, Korea.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Peptide methionine sulfoxide reductase msrA/msrB 1
A, B, C, D
313Streptococcus pneumoniae serotype 4 (strain ATCC BAA-334 / TIGR4)Mutation(s): 1 
Gene Names: msrAB1 (exp3, msrA)
Find proteins for P0A3Q9 (Streptococcus pneumoniae serotype 4 (strain ATCC BAA-334 / TIGR4))
Go to UniProtKB:  P0A3Q9
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Short peptide SHMAEI
E, F, G
6N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.239 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 158.521α = 90.00
b = 165.489β = 90.00
c = 77.281γ = 90.00
Software Package:
Software NamePurpose
ADSCdata collection
CNSrefinement
HKL-2000data reduction
SOLVEphasing
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2008-07-31 
  • Released Date: 2009-06-16 
  • Deposition Author(s): Kim, Y.K., Hwang, K.Y.

Revision History 

  • Version 1.0: 2009-06-16
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance