Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report

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: 51.97 kDa 
• Atom Count: 3686 
• Modelled Residue Count: 447 
• Deposited Residue Count: 462 
• Unique protein chains: 1

3PRB

Structural analysis of protein folding by the Methanococcus jannaschii chaperone FKBP26

• PDB DOI: 10.2210/pdb3PRB/pdb

• Classification: Chaperone, Isomerase
• Organism(s): Methanocaldococcus jannaschii
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2010-11-29 Released: 2011-01-19 
• Deposition Author(s): Martinez-Hackert, E., Hendrickson, W.A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.274 
• R-Value Work: 0.227 
• R-Value Observed: 0.229 

Literature

Structural Analysis of Protein Folding by the Long-Chain Archaeal Chaperone FKBP26.

Martinez-Hackert, E., Hendrickson, W.A.

(2011) J Mol Biol 407: 450-464

• PubMed: 21262232 
• DOI: 10.1016/j.jmb.2011.01.027
• Primary Citation of Related Structures:  
  3PR9, 3PRA, 3PRB, 3PRD


• PubMed Abstract: 
  

In the cell, protein folding is mediated by folding catalysts and chaperones. The two functions are often linked, especially when the catalytic module forms part of a multidomain protein, as in Methanococcus jannaschii peptidyl-prolyl cis/trans isomerase FKBP26. Here, we show that FKBP26 chaperone activity requires both a 50-residue insertion in the catalytic FKBP domain, also called 'Insert-in-Flap' or IF domain, and an 80-residue C-terminal domain. We determined FKBP26 structures from four crystal forms and analyzed chaperone domains in light of their ability to mediate protein-protein interactions. FKBP26 is a crescent-shaped homodimer. We reason that folding proteins are bound inside the large crescent cleft, thus enabling their access to inward-facing peptidyl-prolyl cis/trans isomerase catalytic sites and ipsilateral chaperone domain surfaces. As these chaperone surfaces participate extensively in crystal lattice contacts, we speculate that the observed lattice contacts reflect a proclivity for protein associations and represent substrate interactions by FKBP26 chaperone domains. Finally, we find that FKBP26 is an exceptionally flexible molecule, suggesting a mechanism for nonspecific substrate recognition.

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Organizational Affiliation: 

Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
FKBP-type peptidyl-prolyl cis-trans isomerase	A, B	231	Methanocaldococcus jannaschii	Mutation(s): 0  Gene Names: MJ0825 EC: 5.2.1.8
UniProt
Find proteins for Q58235 (Methanocaldococcus jannaschii (strain ATCC 43067 / DSM 2661 / JAL-1 / JCM 10045 / NBRC 100440)) Explore Q58235  Go to UniProtKB:  Q58235

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.274 
• R-Value Work: 0.227 
• R-Value Observed: 0.229 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 55.532	α = 90
b = 65.199	β = 90
c = 148.616	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
SOLVE	phasing
RESOLVE	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2010-11-29 
• Released Date: 2011-01-19 
Deposition Author(s): Martinez-Hackert, E., Hendrickson, W.A.

Revision History  

• Version 1.0: 2011-01-19
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance