4G29

Structure of the Catalytic Domain of the Salmonella Virulence Factor SseI

• PDB DOI: https://doi.org/10.2210/pdb4G29/pdb

• Classification: PROTEIN BINDING
• Organism(s): Salmonella enterica subsp. enterica serovar Typhimurium str. LT2
• Mutation(s): No 


• Deposited: 2012-07-11 Released: 2012-11-28 
• Deposition Author(s): Stebbins, C.E., Bhaskaran, S.S.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.70 Å
• R-Value Free: 0.214 
• R-Value Work: 0.183 
• R-Value Observed: 0.185 

Literature

Structure of the catalytic domain of the Salmonella virulence factor SseI.

Bhaskaran, S.S., Stebbins, C.E.

(2012) Acta Crystallogr D Biol Crystallogr 68: 1613-1621

• PubMed: 23151626 
• DOI: https://doi.org/10.1107/S0907444912039042
• Primary Citation of Related Structures:  
  4G29, 4G2B


• PubMed Abstract: 
  

  SseI is secreted into host cells by Salmonella and contributes to the establishment of systemic infections. The crystal structure of the C-terminal domain of SseI has been solved to 1.70 Å resolution, revealing it to be a member of the cysteine protease superfamily with a catalytic triad consisting of Cys178, His216 and Asp231 that is critical to its virulence activities. Structure-based analysis revealed that SseI is likely to possess either acyl hydrolase or acyltransferase activity, placing this virulence factor in the rapidly growing class of enzymes of this family utilized by bacterial pathogens inside eukaryotic cells.

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Organizational Affiliation: 

Laboratory of Structural Microbiology, The Rockefeller University, New York, NY 10065, USA.

Biological Assembly 1  

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

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

Macromolecule Content

• Total Structure Weight: 21.66 kDa 
• Atom Count: 1,472 
• Modelled Residue Count: 166 
• Deposited Residue Count: 186 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Secreted effector protein sseI	A	186	Salmonella enterica subsp. enterica serovar Typhimurium str. LT2	Mutation(s): 0  Gene Names: sseI, srfH, STM1051
UniProt
Find proteins for Q8ZQ79 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)) Explore Q8ZQ79  Go to UniProtKB:  Q8ZQ79

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MSE	A	L-PEPTIDE LINKING	C5 H11 N O2 Se		MET

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.70 Å
• R-Value Free: 0.214 
• R-Value Work: 0.183 
• R-Value Observed: 0.185 
• Space Group: P 4₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 52.256	α = 90
b = 52.256	β = 90
c = 132.146	γ = 90

Software Package:

Software Name	Purpose
HKL-2000	data collection
REFMAC	refinement
HKL-2000	data reduction
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2012-11-28 
Deposition Author(s): Stebbins, C.E., Bhaskaran, S.S.

Revision History  

• Version 1.0: 2012-11-28
  Type: Initial release