4U7N

Inactive structure of histidine kinase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.251 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Conformational dynamics of the essential sensor histidine kinase WalK.

Cai, Y.Su, M.Ahmad, A.Hu, X.Sang, J.Kong, L.Chen, X.Wang, C.Shuai, J.Han, A.

(2017) Acta Crystallogr D Struct Biol 73: 793-803

  • DOI: 10.1107/S2059798317013043
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Two-component systems (TCSs) are key elements in bacterial signal transduction in response to environmental stresses. TCSs generally consist of sensor histidine kinases (SKs) and their cognate response regulators (RRs). Many SKs exhibit autokinase, p ...

    Two-component systems (TCSs) are key elements in bacterial signal transduction in response to environmental stresses. TCSs generally consist of sensor histidine kinases (SKs) and their cognate response regulators (RRs). Many SKs exhibit autokinase, phosphoryltransferase and phosphatase activities, which regulate RR activity through a phosphorylation and dephosphorylation cycle. However, how SKs perform different enzymatic activities is poorly understood. Here, several crystal structures of the minimal catalytic region of WalK, an essential SK from Lactobacillus plantarum that shares 60% sequence identity with its homologue VicK from Streptococcus mutans, are presented. WalK adopts an asymmetrical closed structure in the presence of ATP or ADP, in which one of the CA domains is positioned close to the DHp domain, thus leading both the β- and γ-phosphates of ATP/ADP to form hydrogen bonds to the ℇ- but not the δ-nitrogen of the phosphorylatable histidine in the DHp domain. In addition, the DHp domain in the ATP/ADP-bound state has a 25.7° asymmetrical helical bending coordinated with the repositioning of the CA domain; these processes are mutually exclusive and alternate in response to helicity changes that are possibly regulated by upstream signals. In the absence of ATP or ADP, however, WalK adopts a completely symmetric open structure with its DHp domain centred between two outward-reaching CA domains. In summary, these structures of WalK reveal the intrinsic dynamic properties of an SK structure as a molecular basis for multifunctionality.


    Organizational Affiliation

    State Key Laboratory for Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiang'an, Xiamen 361102, People's Republic of China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Histidine protein kinase sensor protein
A, B
277Lactobacillus plantarum (strain JDM1)Mutation(s): 0 
Gene Names: hpk1
Find proteins for A0A0M3KKX3 (Lactobacillus plantarum (strain JDM1))
Go to UniProtKB:  A0A0M3KKX3
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.251 
  • Space Group: P 31
Unit Cell:
Length (Å)Angle (°)
a = 91.599α = 90.00
b = 91.599β = 90.00
c = 97.901γ = 120.00
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2014-07-31 
  • Released Date: 2015-09-02 
  • Deposition Author(s): Cai, Y., Hu, X., Sang, J.

Funding OrganizationLocationGrant Number
China--

Revision History 

  • Version 1.0: 2015-09-02
    Type: Initial release
  • Version 1.1: 2017-10-25
    Type: Database references, Derived calculations