5E9E

Crystal Structure of the Alpha-kinase Domain of Myosin-II Heavy Chain Kinase A in Complex with AMP-PNP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.194 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

Structure of the Dictyostelium Myosin-II Heavy Chain Kinase A (MHCK-A) alpha-kinase domain apoenzyme reveals a novel autoinhibited conformation.

Ye, Q.Yang, Y.van Staalduinen, L.Crawley, S.W.Liu, L.Brennan, S.Cote, G.P.Jia, Z.

(2016) Sci Rep 6: 26634-26634

  • DOI: https://doi.org/10.1038/srep26634
  • Primary Citation of Related Structures:  
    5DYJ, 5E4H, 5E9E

  • PubMed Abstract: 

    The α-kinases are a family of a typical protein kinases present in organisms ranging from protozoa to mammals. Here we report an autoinhibited conformation for the α-kinase domain of Dictyostelium myosin-II heavy chain kinase A (MHCK-A) in which nucleotide binding to the catalytic cleft, located at the interface between an N-terminal and C-terminal lobe, is sterically blocked by the side chain of a conserved arginine residue (Arg592). Previous α-kinase structures have shown that an invariant catalytic aspartic acid residue (Asp766) is phosphorylated. Unexpectedly, in the autoinhibited conformation the phosphoryl group is transferred to the adjacent Asp663, creating an interaction network that stabilizes the autoinhibited state. The results suggest that Asp766 phosphorylation may play both catalytic and regulatory roles. The autoinhibited structure also provides the first view of a phosphothreonine residue docked into the phospho-specific allosteric binding site (Pi-pocket) in the C-lobe of the α-kinase domain.


  • Organizational Affiliation

    Department of Biomedical and Molecular Sciences, Queen's University, Kingston, ON, K7L 3N6, Canada.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Myosin-II heavy chain kinase A
A, B
307Dictyostelium discoideumMutation(s): 0 
Gene Names: mhkAmhckADDB_G0291231
EC: 2.7.11.7
UniProt
Find proteins for P42527 (Dictyostelium discoideum)
Explore P42527 
Go to UniProtKB:  P42527
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP42527
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.194 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.601α = 90
b = 110.112β = 90
c = 78.265γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing
Cootmodel building

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data

  • Released Date: 2016-06-08 
  • Deposition Author(s): Ye, Q., Jia, Z.

Funding OrganizationLocationGrant Number
Canadian Institutes of Health Research (CIHR)Canada--

Revision History  (Full details and data files)

  • Version 1.0: 2016-06-08
    Type: Initial release
  • Version 1.1: 2020-01-08
    Changes: Author supporting evidence, Derived calculations
  • Version 1.2: 2023-09-27
    Changes: Data collection, Database references, Refinement description