1H, 13C and 15N backbone and side chain resonance assignments of the N-terminal domain of the histidine kinase inhibitor KipI from Bacillus subtilis

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 500 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

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A Novel Structure of an Antikinase and its Inhibitor

Jacques, D.A.Langley, D.B.Hynson, R.M.G.Whitten, A.E.Kwan, A.Guss, J.M.Trewhella, J.

(2010) J Mol Biol 

  • DOI: https://doi.org/10.1016/j.jmb.2010.10.047
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    In Bacillus subtilis, the KipI protein is a regulator of the phosphorelay governing the onset of sporulation. KipI binds the relevant sensor histidine kinase, KinA, and inhibits the autophosphorylation reaction. Gene homologues of kipI are found almost ubiquitously throughout the bacterial kingdom and are usually located adjacent to, and often fused with, kipA gene homologues. In B. subtilis, the KipA protein inhibits the antikinase activity of KipI thereby permitting sporulation. We have used a combination of biophysical techniques in order to understand the domain structure and shape of the KipI-KipA complex and probe the nature of the interaction. We also have solved the crystal structure of TTHA0988, a Thermus thermophilus protein of unknown function that is homologous to a KipI-KipA fusion. This structure, which is the first to be described for this class of proteins, provides unique insight into the nature of the KipI-KipA complex. The structure confirms that KipI and KipA are proteins with two domains, and the C-terminal domains belong to the cyclophilin family. These cyclophilin domains are positioned in the complex such that their conserved surfaces face each other to form a large "bicyclophilin" cleft. We discuss the sequence conservation and possible roles across species of this near-ubiquitous protein family, which is poorly understood in terms of function.

  • Organizational Affiliation

    School of Molecular Bioscience, University of Sydney, NSW 2006, Australia.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Kinase A inhibitor101Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: kipIpxpBycsJBSU04080
Find proteins for P60495 (Bacillus subtilis (strain 168))
Explore P60495 
Go to UniProtKB:  P60495
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP60495
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 500 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-11-24
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance