Biological Assembly 1  

 3D View: Structure | Ligand Interaction

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - AB 

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

Macromolecule Content

• Total Structure Weight: 63081.93 
• Atom Count: 4221 
• Residue Count: 567 
• Unique protein chains: 2

1G4U

CRYSTAL STRUCTURE OF THE SALMONELLA TYROSINE PHOSPHATASE AND GTPASE ACTIVATING PROTEIN SPTP BOUND TO RAC1

• DOI: 10.2210/pdb1G4U/pdb
• BMRB: 5511

• Classification: SIGNALING PROTEIN
• Organism(s): Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720), Homo sapiens
• Expression System: Escherichia coli BL21
• Mutation(s): 1 


• Deposited: 2000-10-28 Released: 2001-01-24 
• Deposition Author(s): Stebbins, C.E., Galan, J.E.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.3 Å
• R-Value Free: 0.258 
• R-Value Work: 0.204 

Literature

Modulation of host signaling by a bacterial mimic: structure of the Salmonella effector SptP bound to Rac1.

Stebbins, C.E., Galan, J.E.

(2000) Mol.Cell 6: 1449-1460

• PubMed: 11163217 
• Primary Citation of Related Structures:  
  1G4W


• PubMed Abstract: 
  

Salmonella spp. utilize a specialized protein secretion system to deliver a battery of effector proteins into host cells. Several of these effectors stimulate Cdc42- and Rac1-dependent cytoskeletal changes that promote bacterial internalization. These potentially cytotoxic alterations are rapidly reversed by the effector SptP, a tyrosine phosphatase and GTPase activating protein (GAP) that targets Cdc42 and Rac1. The 2.3 A resolution crystal structure of an SptP-Rac1 transition state complex reveals an unusual GAP architecture that mimics host functional homologs. The phosphatase domain possesses a conserved active site but distinct surface properties. Binding to Rac1 induces a dramatic stabilization in SptP of a four-helix bundle that makes extensive contacts with the Switch I and Switch II regions of the GTPase.

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Organizational Affiliation: 

Section of Microbial Pathogenesis, Boyer Center for Molecular Medicine, Yale School of Medicine, New Haven, CT 06536, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
PROTEIN TYROSINE PHOSPHATASE SPTP	S	383	Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)	Mutation(s): 0  Gene Names: sptP
Find proteins for P74873 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)) Go to UniProtKB:  P74873

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
RAS-RELATED C3 BOTULINUM TOXIN SUBSTRATE 1	R	184	Homo sapiens	Mutation(s): 1  Gene Names: RAC1 (TC25)
Find proteins for P63000 (Homo sapiens) Go to Gene View: RAC1 Go to UniProtKB:  P63000

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
GDP	R	GUANOSINE-5'-DIPHOSPHATE C10 H15 N5 O11 P2 QGWNDRXFNXRZMB-UUOKFMHZSA-N
MG	R	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N
AF3	R	ALUMINUM FLUORIDE Al F3 KLZUFWVZNOTSEM-UHFFFAOYSA-K

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.3 Å
• R-Value Free: 0.258 
• R-Value Work: 0.204 
• Space Group: P 1

Unit Cell:

Length (Å)	Angle (°)
a = 56.722	α = 70.03
b = 58.260	β = 69.51
c = 60.324	γ = 65.03

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2000-10-28 
• Released Date: 2001-01-24 
• Deposition Author(s): Stebbins, C.E., Galan, J.E.

Revision History 

• Version 1.0: 2001-01-24
  Type: Initial release
• Version 1.1: 2008-04-27
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance
• Version 1.3: 2018-02-07
  Type: Experimental preparation
• Version 1.4: 2018-04-04
  Type: Data collection