1HW7

HSP33, HEAT SHOCK PROTEIN WITH REDOX-REGULATED CHAPERONE ACTIVITY

• PDB DOI: https://doi.org/10.2210/pdb1HW7/pdb

• Classification: CHAPERONE
• Organism(s): Escherichia coli
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2001-01-09 Released: 2001-05-16 
• Deposition Author(s): Vijayalakshmi, J., Mukhergee, M.K., Graumann, J., Jakob, U., Saper, M.A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.257 
• R-Value Work: 0.230 

Literature

The 2.2 A crystal structure of Hsp33: a heat shock protein with redox-regulated chaperone activity.

Vijayalakshmi, J., Mukhergee, M.K., Graumann, J., Jakob, U., Saper, M.A.

(2001) Structure 9: 367-375

• PubMed: 11377197 
• DOI: https://doi.org/10.1016/s0969-2126(01)00597-4
• Primary Citation of Related Structures:  
  1HW7


• PubMed Abstract: 
  

  One strategy that cells employ to respond to environmental stresses (temperature, oxidation, and pathogens) is to increase the expression of heat shock proteins necessary to maintain viability. Several heat shock proteins function as molecular chaperones by binding unfolded polypeptides and preventing their irreversible aggregation. Hsp33, a highly conserved bacterial heat shock protein, is a redox-regulated molecular chaperone that appears to protect cells against the lethal effects of oxidative stress.

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Organizational Affiliation: 

Biophysics Research Division, University of Michigan, 48109, Ann Arbor, MI, USA.

Biological Assembly 1  

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

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

Macromolecule Content

• Total Structure Weight: 29.09 kDa 
• Atom Count: 1,972 
• Modelled Residue Count: 229 
• Deposited Residue Count: 255 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
HEAT SHOCK PROTEIN HSP33	A	255	Escherichia coli	Mutation(s): 0  Gene Names: HSLO
UniProt
Find proteins for P0A6Y5 (Escherichia coli (strain K12)) Explore P0A6Y5  Go to UniProtKB:  P0A6Y5

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
MES	G [auth A]	2-(N-MORPHOLINO)-ETHANESULFONIC ACID C6 H13 N O4 S SXGZJKUKBWWHRA-UHFFFAOYSA-N
SO4	B [auth A], C [auth A], D [auth A], E [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
ZN	F [auth A]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.257 
• R-Value Work: 0.230 
• Space Group: P 6₅ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 77.18	α = 90
b = 77.18	β = 90
c = 199.21	γ = 120

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Released Date: 2001-05-16 
Deposition Author(s): Vijayalakshmi, J., Mukhergee, M.K., Graumann, J., Jakob, U., Saper, M.A.

Revision History  

• Version 1.0: 2001-05-16
  Type: Initial release
  
• Version 1.1: 2007-10-16
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Derived calculations, Version format compliance
• Version 1.3: 2024-02-07
  Changes: Data collection, Database references, Derived calculations
• Version 1.4: 2024-04-03
  Changes: Refinement description