Biological Assembly 1  

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 106097.98 
• Atom Count: 6595 
• Residue Count: 1008 
• Unique protein chains: 1

1SJP

Mycobacterium tuberculosis Chaperonin60.2

• DOI: 10.2210/pdb1SJP/pdb

• Classification: CHAPERONE
• Organism(s): Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)
• Expression System: Escherichia coli BL21(DE3)


• Deposited: 2004-03-04 Released: 2004-12-07 
• Deposition Author(s): Qamra, R., Mande, S.C., TB Structural Genomics Consortium (TBSGC)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.2 Å
• R-Value Free: 0.285 
• R-Value Work: 0.241 

Literature

Crystal Structure of the 65-Kilodalton Heat Shock Protein, Chaperonin 60.2, of Mycobacterium tuberculosis

Qamra, R., Mande, S.C.

(2004) J.Bacteriol. 186: 8105-8113

• PubMed: 15547284 
• DOI: 10.1128/JB.186.23.8105-8113.2004


• PubMed Abstract: 
  

Chaperonin 60s are a ubiquitous class of proteins that promote folding and assembly of other cellular polypeptides in an ATP-dependent manner. The oligomeric state of chaperonin 60s has been shown to be crucial to their role as molecular chaperones. Chaperonin 60s are also known to be important stimulators of the immune system. Mycobacterium tuberculosis possesses a duplicate set of chaperonin 60s, both of which have been shown to be potent cytokine stimulators. The M. tuberculosis chaperonin 60s are present in the extracellular milieu at concentrations that are extremely low for the formation of an oligomer. Here we present the crystal structure of one of the chaperonin 60s of M. tuberculosis, also called Hsp65 or chaperonin 60.2, at 3.2-A resolution. We were able to crystallize the protein in its dimeric state. The unusual dimerization of the protein leads to exposure of certain hydrophobic patches on the surface of the protein, and we hypothesize that this might have relevance in binding to immunogenic peptides, as it does in the eukaryotic homologs.

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Related Citations: 

• Mycobacterium tuberculosis GroEL homologues unusually exist as lower oligomers and retain the ability to suppress aggregation of substrate proteins
  Qamra, R.,Srinivas, V.,Mande, S.C.
  (2004) J.Mol.Biol. 342: 605




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Organizational Affiliation: 

Centre for DNA Fingerprinting and Diagnostics, Nacharam, Hyderabad 500076, India.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
60 kDa chaperonin 2	A, B	504	Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)	Mutation(s): 0  Gene Names: groEL2 (groEL-2, groL2, hsp65, mtc28)
Find proteins for P9WPE7 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)) Go to UniProtKB:  P9WPE7

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.2 Å
• R-Value Free: 0.285 
• R-Value Work: 0.241 
• Space Group: P 1 2₁ 1

Unit Cell:

Length (Å)	Angle (°)
a = 58.674	α = 90.00
b = 113.825	β = 94.58
c = 79.535	γ = 90.00

Software Package:

Software Name	Purpose
REFMAC	refinement
SCALEPACK	data scaling
DENZO	data reduction
AMoRE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-03-04 
• Released Date: 2004-12-07 
• Deposition Author(s): Qamra, R., Mande, S.C., TB Structural Genomics Consortium (TBSGC)

Revision History 

• Version 1.0: 2004-12-07
  Type: Initial release
• Version 1.1: 2008-04-29
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance