1LU4

1.1 ANGSTROM RESOLUTION CRYSTAL STRUCTURE OF A SECRETED MYCOBACTERIUM TUBERCULOSIS DISULFIDE OXIDOREDUCTASE HOMOLOGOUS TO E. COLI DSBE: IMPLICATIONS FOR FUNCTIONS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.12 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.152 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Gram-positive DsbE Proteins Function Differently from Gram-negative DsbE Homologs: A STRUCTURE TO FUNCTION ANALYSIS OF DsbE FROM MYCOBACTERIUM TUBERCULOSIS.

Goulding, C.W.Apostol, M.I.Gleiter, S.Parseghian, A.Bardwell, J.Gennaro, M.Eisenberg, D.

(2004) J.Biol.Chem. 279: 3516-3524

  • DOI: 10.1074/jbc.M311833200

  • PubMed Abstract: 
  • Mycobacterium tuberculosis, a Gram-positive bacterium, encodes a secreted Dsb-like protein annotated as Mtb DsbE (Rv2878c, also known as MPT53). Because Dsb proteins in Escherichia coli and other bacteria seem to catalyze proper folding during protei ...

    Mycobacterium tuberculosis, a Gram-positive bacterium, encodes a secreted Dsb-like protein annotated as Mtb DsbE (Rv2878c, also known as MPT53). Because Dsb proteins in Escherichia coli and other bacteria seem to catalyze proper folding during protein secretion and because folding of secreted proteins is thought to be coupled to disulfide oxidoreduction, the function of Mtb DsbE may be to ensure that secreted proteins are in their correctly folded states. We have determined the crystal structure of Mtb DsbE to 1.1 A resolution, which reveals a thioredoxin-like domain with a typical CXXC active site. These cysteines are in their reduced state. Biochemical characterization of Mtb DsbE reveals that this disulfide oxidoreductase is an oxidant, unlike Gram-negative bacteria DsbE proteins, which have been shown to be weak reductants. In addition, the pK(a) value of the active site, solvent-exposed cysteine is approximately 2 pH units lower than that of Gram-negative DsbE homologs. Finally, the reduced form of Mtb DsbE is more stable than the oxidized form, and Mtb DsbE is able to oxidatively fold hirudin. Structural and biochemical analysis implies that Mtb DsbE functions differently from Gram-negative DsbE homologs, and we discuss its possible functional role in the bacterium.


    Organizational Affiliation

    Howard Hughes Medical Institute and UCLA-Department of Energy Institute of Genomics and Proteomics, Los Angeles, California 90095-1570.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SOLUBLE SECRETED ANTIGEN MPT53
A
136Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)Mutation(s): 0 
Gene Names: mpt53 (mpb53)
Find proteins for P9WG65 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Go to UniProtKB:  P9WG65
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.12 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.152 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 60.640α = 90.00
b = 60.640β = 90.00
c = 79.775γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
DENZOdata reduction
SHELXmodel building
SHELXL-97refinement
SHELXphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-10-14
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance