Biological Assembly 1  

 3D View: Structure | Electron Density

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 8-mer - A6B2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 260953.73 
• Atom Count: 17207 
• Residue Count: 2284 
• Unique protein chains: 2

2PT7

Crystal structure of Cag VirB11 (HP0525) and an inhibitory protein (HP1451)

• DOI: 10.2210/pdb2PT7/pdb

• Classification: hydrolase/protein binding
• Organism(s): Helicobacter pylori (strain ATCC 700392 / 26695), Helicobacter pylori
• Expression System: Escherichia coli BL21


• Deposited: 2007-05-08 Released: 2007-11-13 
• Deposition Author(s): Hare, S., Fischer, W., Williams, R., Terradot, L., Bayliss, R., Haas, R., Waksman, G.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.4 Å
• R-Value Free: 0.270 
• R-Value Work: 0.230 

Literature

Identification, structure and mode of action of a new regulator of the Helicobacter pylori HP0525 ATPase.

Hare, S., Fischer, W., Williams, R., Terradot, L., Bayliss, R., Haas, R., Waksman, G.

(2007) Embo J. 26: 4926-4934

• PubMed: 17972918 
• DOI: 10.1038/sj.emboj.7601904


• PubMed Abstract: 
  

Helicobacter pylori is one of the world's most successful human pathogens causing gastric ulcers and cancers. A key virulence factor of H. pylori is the Cag pathogenicity island, which encodes a type IV secretion system. HP0525 is an essential component of the Cag system and acts as an inner membrane associated ATPase. HP0525 forms double hexameric ring structures, with the C-terminal domains (CTDs) forming a closed ring and the N-terminal domains (NTDs) forming a dynamic, open ring. Here, the crystal structure of HP0525 in complex with a fragment of HP1451, a protein of previously unknown function, is reported. The HP1451 construct consists of two domains similar to nucleic acid-binding domains. Two HP1451 molecules bind to the HP0525 NTDs on opposite sides of the hexamer, locking it in the closed form and forming a partial lid over the HP0525 chamber. From the structure, it is suggested that HP1451 acts as an inhibitory factor of HP0525 to regulate Cag-mediated secretion, a suggestion confirmed by results of in vitro ATPase assay and in vivo pull-down experiments.

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Organizational Affiliation: 

School of Crystallography, Birkbeck College, London, UK.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Cag-alfa	A, B, C, D, E, F	330	Helicobacter pylori	Mutation(s): 0  Gene Names: cag-alfa (cag-alpha, cagAlpha, virB11)
Find proteins for Q7BK04 (Helicobacter pylori) Go to UniProtKB:  Q7BK04

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
Hypothetical protein	G, H	152	Helicobacter pylori (strain ATCC 700392 / 26695)	Mutation(s): 0
Find proteins for O25990 (Helicobacter pylori (strain ATCC 700392 / 26695)) Go to UniProtKB:  O25990

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.4 Å
• R-Value Free: 0.270 
• R-Value Work: 0.230 
• Space Group: P 1

Unit Cell:

Length (Å)	Angle (°)
a = 86.851	α = 111.04
b = 86.900	β = 95.98
c = 104.129	γ = 104.94

Software Package:

Software Name	Purpose
REFMAC	refinement
PDB_EXTRACT	data extraction
MOLREP	phasing
ADSC	data collection
MOSFLM	data reduction
SCALA	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2007-05-08 
• Released Date: 2007-11-13 
• Deposition Author(s): Hare, S., Fischer, W., Williams, R., Terradot, L., Bayliss, R., Haas, R., Waksman, G.

Revision History 

• Version 1.0: 2007-11-13
  Type: Initial release
• Version 1.1: 2011-07-13
  Type: Advisory, Source and taxonomy, Version format compliance