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

Experimental Data Snapshot

  • Resolution: 2.15 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.197 

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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

  • DOI: https://doi.org/10.1016/s0969-2126(03)00169-2
  • Primary Citation of Related Structures:  
    1OR4, 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.

  • Organizational Affiliation

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

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Heme-based aerotactic transducer hemAT
A, B
178Bacillus subtilisMutation(s): 0 
Gene Names: yhfV
Find proteins for O07621 (Bacillus subtilis (strain 168))
Explore O07621 
Go to UniProtKB:  O07621
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO07621
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.15 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.197 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.994α = 90
b = 80.117β = 90
c = 85.944γ = 90
Software Package:
Software NamePurpose
SHELXmodel building
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-09-23
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-02-14
    Changes: Data collection, Database references, Derived calculations