Biological Assembly 1  

 3D View: Structure

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 61.70 kDa 
• Atom Count: 4943 
• Modelled Residue Count: 560 
• Deposited Residue Count: 560 
• Unique protein chains: 1

1DQZ

CRYSTAL STRUCTURE OF ANTIGEN 85C FROM MYCOBACTERIUM TUBERCULOSIS

• DOI: 10.2210/pdb1DQZ/pdb

• Classification: IMMUNE SYSTEM
• Organism(s): Mycobacterium tuberculosis
• Mutation(s): No 


• Deposited: 2000-01-05 Released: 2000-07-12 
• Deposition Author(s): Ronning, D.R., Klabunde, T., Sacchettini, J.C., TB Structural Genomics Consortium (TBSGC)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.50 Å
• R-Value Free: 0.185 
• R-Value Work: 0.167 
• R-Value Observed: 0.167 

Literature

Crystal structure of the secreted form of antigen 85C reveals potential targets for mycobacterial drugs and vaccines.

Ronning, D.R., Klabunde, T., Besra, G.S., Vissa, V.D., Belisle, J.T., Sacchettini, J.C.

(2000) Nat Struct Biol 7: 141-146

• PubMed: 10655617 
• DOI: 10.1038/72413
• Primary Citation of Related Structures:  
  1DQZ, 1DQY


• PubMed Abstract: 
  

The antigen 85 (ag85) complex, composed of three proteins (ag85A, B and C), is a major protein component of the Mycobacterium tuberculosis cell wall. Each protein possesses a mycolyltransferase activity required for the biogenesis of trehalose dimycolate (cord factor), a dominant structure necessary for maintaining cell wall integrity. The crystal structure of recombinant ag85C from M. tuberculosis, refined to a resolution of 1.5 A, reveals an alpha/beta-hydrolase polypeptide fold, and a catalytic triad formed by Ser 124, Glu 228 and His 260. ag85C complexed with a covalent inhibitor implicates residues Leu 40 and Met 125 as components of the oxyanion hole. A hydrophobic pocket and tunnel extending 21 A into the core of the protein indicates the location of a probable trehalose monomycolate binding site. Also, a large region of conserved surface residues among ag85A, B and C is a probable site for the interaction of ag85 proteins with human fibronectin.

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Organizational Affiliation: 

Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas 77844-2128, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (ANTIGEN 85-C)	A, B	280	Mycobacterium tuberculosis	Mutation(s): 0  EC: 2.3.1.122 (UniProt), 2.3.1.20 (UniProt)
UniProt
Find proteins for P9WQN9 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)) Explore P9WQN9  Go to UniProtKB:  P9WQN9

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.50 Å
• R-Value Free: 0.185 
• R-Value Work: 0.167 
• R-Value Observed: 0.167 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 67.718	α = 90
b = 75.947	β = 90
c = 137.388	γ = 90

Software Package:

Software Name	Purpose
HKL-2000	data collection
HKL-2000	data reduction
SHARP	phasing
CNS	refinement
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2000-01-05 
• Released Date: 2000-07-12 
Deposition Author(s): Ronning, D.R., Klabunde, T., Sacchettini, J.C., TB Structural Genomics Consortium (TBSGC)

Revision History  

• Version 1.0: 2000-07-12
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance