5FA9

Bifunctional Methionine Sulfoxide Reductase AB (MsrAB) from Treponema denticola


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.302 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.205 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Essential Role of the Linker Region in the Higher Catalytic Efficiency of a Bifunctional MsrA-MsrB Fusion Protein

Han, A.R.Kim, M.J.Kwak, G.H.Son, J.Hwang, K.Y.Kim, H.Y.

(2016) Biochemistry 55: 5117-5127

  • DOI: 10.1021/acs.biochem.6b00544

  • PubMed Abstract: 
  • Many bacteria, particularly pathogens, possess methionine sulfoxide reductase A (MsrA) and B (MsrB) as a fusion form (MsrAB). However, it is not clear why they possess a fusion MsrAB form rather than the separate enzymes that exist in most organisms. ...

    Many bacteria, particularly pathogens, possess methionine sulfoxide reductase A (MsrA) and B (MsrB) as a fusion form (MsrAB). However, it is not clear why they possess a fusion MsrAB form rather than the separate enzymes that exist in most organisms. In this study, we performed biochemical and kinetic analyses of MsrAB from Treponema denticola (TdMsrAB), single-domain forms (TdMsrA and TdMsrB), and catalytic Cys mutants (TdMsrAB(C11S) and TdMsrAB(C285S)). We found that the catalytic efficiency of both MsrA and MsrB increased after fusion of the domains and that the linker region (iloop) that connects TdMsrA and TdMsrB is required for the higher catalytic efficiency of TdMsrAB. We also determined the crystal structure of TdMsrAB at 2.3 Å, showing that the iloop mainly interacts with TdMsrB via hydrogen bonds. Further kinetic analysis using the iloop mutants revealed that the iloop-TdMsrB interactions are critical to MsrB and MsrA activities. We also report the structure in which an oxidized form of dithiothreitol, an in vitro reductant for MsrA and MsrB, is present in the active site of TdMsrA. Collectively, the results of this study reveal an essential role of the iloop in maintaining the higher catalytic efficiency of the MsrAB fusion enzyme and provide a better understanding of why the MsrAB enzyme exists as a fused form.


    Organizational Affiliation

    Department of Biosystems and Biotechnology, College of Life Sciences and Biotechnology, Korea University , Seoul 02841, Republic of Korea.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Peptide methionine sulfoxide reductase MsrA
A, B
325Treponema denticola (strain ATCC 35405 / CIP 103919 / DSM 14222)Mutation(s): 2 
Gene Names: msrA
EC: 1.8.4.11
Find proteins for Q73PT7 (Treponema denticola (strain ATCC 35405 / CIP 103919 / DSM 14222))
Go to UniProtKB:  Q73PT7
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
D1D
Query on D1D

Download SDF File 
Download CCD File 
A, B
(4S,5S)-1,2-DITHIANE-4,5-DIOL
C4 H8 O2 S2
YPGMOWHXEQDBBV-QWWZWVQMSA-N
 Ligand Interaction
DTT
Query on DTT

Download SDF File 
Download CCD File 
A, B
2,3-DIHYDROXY-1,4-DITHIOBUTANE
1,4-DITHIOTHREITOL
C4 H10 O2 S2
VHJLVAABSRFDPM-IMJSIDKUSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.302 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.205 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 144.956α = 90.00
b = 95.584β = 116.24
c = 81.390γ = 90.00
Software Package:
Software NamePurpose
MOLREPphasing
Cootrefinement
HKL-2000data scaling
PHENIXmodel building
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-09-14
    Type: Initial release
  • Version 1.1: 2016-09-28
    Type: Database references