6BO0

MdbA protein, a thiol-disulfide oxidoreductase from Corynebacterium matruchotii


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.2 Å
  • R-Value Free: 0.154 
  • R-Value Work: 0.122 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural Basis of a Thiol-Disulfide Oxidoreductase in the Hedgehog-Forming Actinobacterium Corynebacterium matruchotii.

Luong, T.T.Tirgar, R.Reardon-Robinson, M.E.Joachimiak, A.Osipiuk, J.Ton-That, H.

(2018) J. Bacteriol. 200: --

  • DOI: 10.1128/JB.00783-17

  • PubMed Abstract: 
  • The actinobacterium <i>Corynebacterium matruchotii </i> has been implicated in nucleation of oral microbial consortia leading to biofilm formation. Due to the lack of genetic tools, little is known about basic cellular processes, including protein s ...

    The actinobacterium Corynebacterium matruchotii has been implicated in nucleation of oral microbial consortia leading to biofilm formation. Due to the lack of genetic tools, little is known about basic cellular processes, including protein secretion and folding, in this organism. We report here a survey of the C. matruchotii genome, which encodes a large number of exported proteins containing paired cysteine residues, and identified an oxidoreductase that is highly homologous to the Corynebacterium diphtheriae thiol-disulfide oxidoreductase MdbA (MdbA Cd ). Crystallization studies uncovered that the 1.2-Å resolution structure of C. matruchotii MdbA (MdbA Cm ) possesses two conserved features found in actinobacterial MdbA enzymes, a thioredoxin-like fold and an extended α-helical domain. By reconstituting the disulfide bond-forming machine in vitro , we demonstrated that MdbA Cm catalyzes disulfide bond formation within the actinobacterial pilin FimA. A new gene deletion method supported that mdbA is essential in C. matruchotii Remarkably, heterologous expression of MdbA Cm in the C. diphtheriae Δ mdbA mutant rescued its known defects in cell growth and morphology, toxin production, and pilus assembly, and this thiol-disulfide oxidoreductase activity required the catalytic motif CXXC. Altogether, the results suggest that MdbA Cm is a major thiol-disulfide oxidoreductase, which likely mediates posttranslocational protein folding in C. matruchotii by a mechanism that is conserved in Actinobacteria IMPORTANCE The actinobacterium Corynebacterium matruchotii has been implicated in the development of oral biofilms or dental plaque; however, little is known about the basic cellular processes in this organism. We report here a high-resolution structure of a C. matruchotii oxidoreductase that is highly homologous to the Corynebacterium diphtheriae thiol-disulfide oxidoreductase MdbA. By biochemical analysis, we demonstrated that C. matruchotii MdbA catalyzes disulfide bond formation in vitro Furthermore, a new gene deletion method revealed that deletion of mdbA is lethal in C. matruchotii Remarkably, C. matruchotii MdbA can replace C. diphtheriae MdbA to maintain normal cell growth and morphology, toxin production, and pilus assembly. Overall, our studies support the hypothesis that C. matruchotii utilizes MdbA as a major oxidoreductase to catalyze oxidative protein folding.


    Organizational Affiliation

    Department of Microbiology & Molecular Genetics, University of Texas Health Science Center, Houston, Texas, USA.,Department of Microbiology & Molecular Genetics, University of Texas Health Science Center, Houston, Texas, USA josipiuk@anl.gov ton-that.hung@uth.tmc.edu.,The University of Chicago, Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, Illinois, USA.,Center for Structural Genomics of Infectious Diseases, Argonne National Laboratory, Argonne, Illinois, USA josipiuk@anl.gov ton-that.hung@uth.tmc.edu.,Department of Microbiology & Immunobiology, Harvard Medical School, Boston, Massachusetts, USA.,Center for Structural Genomics of Infectious Diseases, Argonne National Laboratory, Argonne, Illinois, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MdbA protein
A
200Corynebacterium matruchotii ATCC 14266Mutation(s): 0 
Find proteins for E0DH37 (Corynebacterium matruchotii ATCC 14266)
Go to UniProtKB:  E0DH37
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PG4
Query on PG4

Download SDF File 
Download CCD File 
A
TETRAETHYLENE GLYCOL
C8 H18 O5
UWHCKJMYHZGTIT-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
CSO
Query on CSO
A
L-PEPTIDE LINKINGC3 H7 N O3 SCYS
Experimental Data & Validation

Experimental Data

Unit Cell:
Length (Å)Angle (°)
a = 35.593α = 90.00
b = 82.578β = 90.00
c = 123.484γ = 90.00
Software Package:
Software NamePurpose
HKL-3000phasing
HKL-3000data scaling
HKL-3000data reduction
PDB_EXTRACTdata extraction
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited StatesHHSN272200700058C
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited StatesHHSN272201200026C

Revision History 

  • Version 1.0: 2017-12-13
    Type: Initial release
  • Version 1.1: 2018-01-17
    Type: Author supporting evidence
  • Version 1.2: 2018-03-28
    Type: Data collection, Database references
  • Version 1.3: 2018-04-18
    Type: Data collection, Database references