3DWG

Crystal structure of a sulfur carrier protein complex found in the cysteine biosynthetic pathway of Mycobacterium tuberculosis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.53 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.178 

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This is version 1.1 of the entry. See complete history


Literature

Crystal structure of a sulfur carrier protein complex found in the cysteine biosynthetic pathway of Mycobacterium tuberculosis.

Jurgenson, C.T.Burns, K.E.Begley, T.P.Ealick, S.E.

(2008) Biochemistry 47: 10354-10364

  • DOI: https://doi.org/10.1021/bi800915j
  • Primary Citation of Related Structures:  
    3DWG, 3DWI, 3DWM

  • PubMed Abstract: 

    The structure of the protein complex CysM-CysO from a new cysteine biosynthetic pathway found in the H37Rv strain of Mycobacterium tuberculosis has been determined at 1.53 A resolution. CysM (Rv1336) is a PLP-containing beta-replacement enzyme and CysO (Rv1335) is a sulfur carrier protein with a ubiquitin-like fold. CysM catalyzes the replacement of the acetyl group of O-acetylserine by CysO thiocarboxylate to generate a protein-bound cysteine that is released in a subsequent proteolysis reaction. The protein complex in the crystal structure is asymmetric with one CysO protomer binding to one end of a CysM dimer. Additionally, the structures of CysM and CysO were determined individually at 2.8 and 2.7 A resolution, respectively. Sequence alignments with homologues and structural comparisons with CysK, a cysteine synthase that does not utilize a sulfur carrier protein, revealed high conservation of active site residues; however, residues in CysM responsible for CysO binding are not conserved. Comparison of the CysM-CysO binding interface with other sulfur carrier protein complexes revealed a similarity in secondary structural elements that contribute to complex formation in the ThiF-ThiS and MoeB-MoaD systems, despite major differences in overall folds. Comparison of CysM with and without bound CysO revealed conformational changes associated with CysO binding.


  • Organizational Affiliation

    Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853-1301, USA.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cysteine synthase B
A, B
325Mycobacterium tuberculosis H37RvMutation(s): 0 
Gene Names: cysMRv1336MT1377MTCY130.21
EC: 2.5.1.47 (PDB Primary Data), 2.5.1.113 (UniProt)
UniProt
Find proteins for P9WP53 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WP53 
Go to UniProtKB:  P9WP53
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WP53
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
9.5 kDa culture filtrate antigen cfp10A93Mycobacterium tuberculosis H37RvMutation(s): 0 
Gene Names: cfp10ARv1335MT1376.1MTCY130.20
UniProt
Find proteins for P9WP33 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WP33 
Go to UniProtKB:  P9WP33
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WP33
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.53 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.178 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.81α = 90
b = 80.426β = 105.74
c = 89.619γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
SCALEPACKdata scaling
SHARPphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-09-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Source and taxonomy, Version format compliance