1R88

The crystal structure of Mycobacterium tuberculosis MPT51 (FbpC1)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.71 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.189 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The structure of Mycobacterium tuberculosis MPT51 (FbpC1) defines a new family of non-catalytic alpha/beta hydrolases.

Wilson, R.A.Maughan, W.N.Kremer, L.Besra, G.S.Futterer, K.

(2004) J.Mol.Biol. 335: 519-530


  • PubMed Abstract: 
  • Mycobacterium tuberculosis, the causative agent of tuberculosis, is known to secrete a number of highly immunogenic proteins that are thought to confer pathogenicity, in part, by mediating binding to host tissues. Among these secreted proteins are th ...

    Mycobacterium tuberculosis, the causative agent of tuberculosis, is known to secrete a number of highly immunogenic proteins that are thought to confer pathogenicity, in part, by mediating binding to host tissues. Among these secreted proteins are the trimeric antigen 85 (Ag85) complex and the related MPT51 protein, also known as FbpC1. While the physiological function of Ag85, a mycolyltransferase required for the biosynthesis of the cell wall component alpha,alpha'-trehalose dimycolate (or cord factor), has been identified recently, the function of the closely related MPT51 (approximately 40% identity with the Ag85 components) remains to be established. The crystal structure of M.tuberculosis MPT51, determined to 1.7 A resolution, shows that MPT51, like the Ag85 components Ag85B and Ag85C2, folds as an alpha/beta hydrolase, but it does not contain any of the catalytic elements required for mycolyltransferase activity. Moreover, the absence of a recognizable alpha,alpha'-trehalose monomycolate-binding site and the failure to detect an active site suggest that the function of MPT51 is of a non-enzymatic nature and that MPT51 may in fact represent a new family of non-catalytic alpha/beta hydrolases. Previous experimental evidence and the structural similarity to some integrins and carbohydrate-binding proteins led to the hypothesis that MPT51 might have a role in host tissue attachment, whereby ligands may include the serum protein fibronectin and small sugars.


    Organizational Affiliation

    School of Biosciences, The University of Birmingham, Edgabston, Birmingham B15 2TT, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MPT51/MPB51 antigen
A, B
280Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)Mutation(s): 0 
Gene Names: mpt51 (fbpC1, fbpD, mpb51)
Find proteins for P9WQN7 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Go to UniProtKB:  P9WQN7
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.71 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.189 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 59.900α = 90.00
b = 108.900β = 90.00
c = 109.800γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-12-30
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance