3E0M

Crystal structure of fusion protein of MsrA and MsrB


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.239 
  • R-Value Observed: 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:  
    3E0O, 3E0M

  • 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, in some bacteria these two enzymes are fused to form a single polypeptide (MsrAB) ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Peptide methionine sulfoxide reductase msrA/msrB 1A, B, C, D313Streptococcus pneumoniaeMutation(s): 1 
Gene Names: msrAB1exp3msrASP_1359
EC: 1.8.4.11 (PDB Primary Data), 1.8.4.12 (PDB Primary Data)
Find proteins for P0A3Q9 (Streptococcus pneumoniae serotype 4 (strain ATCC BAA-334 / TIGR4))
Explore P0A3Q9 
Go to UniProtKB:  P0A3Q9
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Short peptide SHMAEIE, F, G6N/AMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.239 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 158.521α = 90
b = 165.489β = 90
c = 77.281γ = 90
Software Package:
Software NamePurpose
CNSrefinement
ADSCdata collection
HKL-2000data reduction
HKL-2000data scaling
SOLVEphasing

Structure Validation

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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  (Full details and data files)

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