3I2Z | pdb_00003i2z

Structure of cold shock protein E from Salmonella typhimurium

• PDB DOI: https://doi.org/10.2210/pdb3I2Z/pdb

• Classification: GENE REGULATION
• Organism(s): Salmonella enterica subsp. enterica serovar Typhimurium
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2009-06-30 Released: 2009-12-22 
• Deposition Author(s): Morgan, H.P., McNae, I., Wear, M.A., Gallagher, M., Walkinshaw, M.D.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.10 Å
• R-Value Free: 
  0.234 (Depositor), 0.248 (DCC) 
• R-Value Work: 
  0.204 (Depositor) 
• R-Value Observed: 
  0.205 (Depositor) 

Starting Model: experimental

Literature

Crystallization and X-ray structure of cold-shock protein E from Salmonella typhimurium

Morgan, H.P., Wear, M.A., McNae, I., Gallagher, M.P., Walkinshaw, M.D.

(2009) Acta Crystallogr Sect F Struct Biol Cryst Commun 65: 1240-1245

• PubMed: 20054119 
• DOI: https://doi.org/10.1107/S1744309109033788
• Primary Citation Related Structures: 
  3I2Z


• PubMed Abstract: 
  

  In prokaryotic organisms, cold shock triggers the production of a small highly conserved family of cold-shock proteins (CSPs). CSPs have been well studied structurally and functionally in Escherichia coli and Bacillus subtilis, but Salmonella typhimurium CSPs remain relatively uncharacterized. In S. typhimurium, six homologous CSPs have been identified: StCspA-E and StCspH. The crystal structure of cold-shock protein E from S. typhimurium (StCspE) has been determined at 1.1 A resolution and has an R factor of 0.203 after refinement. The three-dimensional structure is similar to those of previously determined CSPs and is composed of five antiparallel beta-strands forming a classic OB fold/five-stranded beta-barrel. This first structure of a CSP from S. typhimurium provides new insight into the cold-shock response of this bacterium.

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Organizational Affiliation: 
• Centre for Translational and Chemical Biology, School of Biological Sciences, University of Edinburgh, Edinburgh EH9 3JR, Scotland.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 2 assigned by authors and generated by PISA (software)

Biological Assembly 3  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 3 assigned by authors and generated by PISA (software)

Macromolecule Content 

• Total Structure Weight: 15.37 kDa 
• Atom Count: 1,173 
• Modeled Residue Count: 138 
• Deposited Residue Count: 142 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
RNA chaperone, negative regulator of cspA transcription	A [auth B], B [auth A]	71	Salmonella enterica subsp. enterica serovar Typhimurium	Mutation(s): 0  Gene Names: cold shock protein E, cspE
UniProt
Find proteins for Q7CQZ5 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)) Explore Q7CQZ5  Go to UniProtKB:  Q7CQZ5

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.10 Å
• R-Value Free:  0.234 (Depositor), 0.248 (DCC) 
• R-Value Work:  0.204 (Depositor) 
• R-Value Observed: 0.205 (Depositor) 

Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 29.395	α = 90
b = 46.798	β = 103.84
c = 46.718	γ = 90

Software Package:

Software Name	Purpose
AMoRE	phasing
REFMAC	refinement
SCALA	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2009-12-22 
Deposition Author(s): Morgan, H.P., McNae, I., Wear, M.A., Gallagher, M., Walkinshaw, M.D.

Revision History  

• Version 1.0: 2009-12-22
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2023-11-01
  Changes: Data collection, Database references, Refinement description