Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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

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

Macromolecule Content

• Total Structure Weight: 42967.20 
• Atom Count: 2756 
• Residue Count: 356 
• Unique protein chains: 1

1OR4

Crystal Structure of HemAT sensor domain from B.subtilis in the cyano-liganded form

• DOI: 10.2210/pdb1OR4/pdb

• Classification: SIGNALING PROTEIN
• Organism(s): Bacillus subtilis (strain 168)
• Expression System: Escherichia coli BL21(DE3)


• Deposited: 2003-03-11 Released: 2003-09-23 
• Deposition Author(s): Zhang, W., Phillips Jr., G.N.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.15 Å
• R-Value Free: 0.258 
• R-Value Work: 0.197 

Literature

Structure of the oxygen sensor in Bacillus subtilis: signal transduction of chemotaxis by control of symmetry.

Zhang, W., Phillips, G.N.

(2003) Structure 11: 1097-1110

• PubMed: 12962628 
• Primary Citation of Related Structures:  
  1OR6


• PubMed Abstract: 
  

Much is now known about chemotaxis signaling transduction for Escherichia coli and Salmonella typhimurium. The mechanism of chemotaxis of Bacillus subtilis is, in a sense, reversed. Attractant binding strengthens the activity of histidine kinase in B. subtilis, instead of an inhibition reaction. The HemAT from B. subtilis can detect oxygen and transmit the signal to regulatory proteins that control the direction of flagella rotation. We have determined the crystal structures of the HemAT sensor domain in liganded and unliganded forms at 2.15 A and 2.7 A resolution, respectively. The liganded structure reveals a highly symmetrical organization. Tyrosine70 shows distinct conformational changes on one subunit when ligands are removed. Our study suggests that disruption of the symmetry of HemAT plays an important role in initiating the chemotaxis signaling transduction cascade.

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Organizational Affiliation: 

Department of Biochemistry and Cell Biology, Rice University, Houston, TX 77005, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Heme-based aerotactic transducer hemAT	A, B	178	Bacillus subtilis (strain 168)	Mutation(s): 0  Gene Names: hemAT (yhfV)
Find proteins for O07621 (Bacillus subtilis (strain 168)) Go to UniProtKB:  O07621

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
CYN	A, B	CYANIDE ION C N XFXPMWWXUTWYJX-UHFFFAOYSA-N
HEM	A, B	PROTOPORPHYRIN IX CONTAINING FE HEME C34 H32 Fe N4 O4 KABFMIBPWCXCRK-RGGAHWMASA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.15 Å
• R-Value Free: 0.258 
• R-Value Work: 0.197 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 49.994	α = 90.00
b = 80.117	β = 90.00
c = 85.944	γ = 90.00

Software Package:

Software Name	Purpose
SOLVE	phasing
SCALEPACK	data scaling
SHELXL-97	refinement
DENZO	data reduction
XTALVIEW	refinement
SHELX	model building

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-03-11 
• Released Date: 2003-09-23 
• Deposition Author(s): Zhang, W., Phillips Jr., G.N.

Revision History 

• Version 1.0: 2003-09-23
  Type: Initial release
• Version 1.1: 2008-04-29
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance