Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Helical - H  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

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

Macromolecule Content

• Total Structure Weight: 180.53 kDa 
• Atom Count: 11914 
• Residue Count: 1530 
• Unique protein chains: 1

1M5Y

Crystallographic Structure of SurA, a Molecular Chaperone that Facilitates Outer Membrane Porin Folding

• DOI: 10.2210/pdb1M5Y/pdb

• Classification: ISOMERASE, CELL CYCLE
• Organism(s): Escherichia coli
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2002-07-10 Released: 2002-11-08 
• Deposition Author(s): Bitto, E., McKay, D.B.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.00 Å
• R-Value Free: 0.283 
• R-Value Work: 0.228 
• R-Value Observed: 0.228 

Literature

Crystallographic Structure of SurA, a Molecular Chaperone that Facilitates Folding of Outer Membrane Porins

Bitto, E., McKay, D.B.

(2002) Structure 10: 1489-1498

• PubMed: 12429090 
• DOI: 10.1016/s0969-2126(02)00877-8
• Primary Citation of Related Structures:  
  1M5Y


• PubMed Abstract: 
  

The SurA protein facilitates correct folding of outer membrane proteins in gram-negative bacteria. The sequence of Escherichia coli SurA presents four segments, two of which are peptidyl-prolyl isomerases (PPIases); the crystal structure reveals an asymmetric dumbbell, in which the amino-terminal, carboxy-terminal, and first PPIase segments of the sequence form a core structural module, and the second PPIase segment is a satellite domain tethered approximately 30 A from this module. The core module, which is implicated in membrane protein folding, has a novel fold that includes an extended crevice. Crystal contacts show that peptides bind within the crevice, suggesting a model for chaperone activity whereby segments of polypeptide may be repetitively sequestered and released during the membrane protein-folding process.

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Organizational Affiliation: 

Department of Structural Biology, Stanford University School of Medicine, Stanford, CA 94305, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Survival protein surA	A, B, C, D	408	Escherichia coli	Mutation(s): 0  Gene Names: surA EC: 5.2.1.8
Find proteins for P0ABZ6 (Escherichia coli (strain K12)) Explore P0ABZ6  Go to UniProtKB:  P0ABZ6

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.00 Å
• R-Value Free: 0.283 
• R-Value Work: 0.228 
• R-Value Observed: 0.228 
• Space Group: F 2 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 158.817	α = 90
b = 223.406	β = 90
c = 279.721	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
CNS	refinement
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2002-07-10 
• Released Date: 2002-11-08 
Deposition Author(s): Bitto, E., McKay, D.B.

Revision History 

• Version 1.0: 2002-11-08
  Type: Initial release
  
• Version 1.1: 2008-04-28
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2020-01-22
  Changes: Data collection, Derived calculations