Crystal structure of human calcium/calmodulin-dependent protein kinase I 1-315 in complex with ATP

Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.198 

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Crystal structures of human CaMKIalpha reveal insights into the regulation mechanism of CaMKI.

Zha, M.Zhong, C.Ou, Y.Han, L.Wang, J.Ding, J.

(2012) PLoS One 7: e44828-e44828

  • DOI: https://doi.org/10.1371/journal.pone.0044828
  • Primary Citation of Related Structures:  
    4FG7, 4FG8, 4FG9, 4FGB

  • PubMed Abstract: 

    Human calcium/calmodulin-dependent protein kinase I (CaMKI) plays pivotal roles in the nervous system. The activity of human CaMKI is regulated by a regulatory region including an autoinhibitory segment and a CaM-binding segment. We report here four structures of three CaMKIα truncates in apo form and in complexes with ATP. In an apo, autoinhibited structure, the activation segment adopts a unique helical conformation which together with the autoinhibitory segment constrains helices αC and αD in inactive conformations, sequesters Thr177 from being phosphorylated, and occludes the substrate-binding site. In an ATP-bound, inactive structure, the activation segment is largely disordered and the CaM-binding segment protrudes out ready for CaM binding. In an ATP-bound, active structure, the regulatory region is dissociated from the catalytic core and the catalytic site assumes an active conformation. Detailed structural analyses reveal the interplay of the regulatory region, the activation segment, and the nucleotide-binding site in the regulation of CaMKI.

  • Organizational Affiliation

    State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Calcium/calmodulin-dependent protein kinase type 1
A, B
315Homo sapiensMutation(s): 0 
Gene Names: CAMK1
UniProt & NIH Common Fund Data Resources
Find proteins for Q14012 (Homo sapiens)
Explore Q14012 
Go to UniProtKB:  Q14012
PHAROS:  Q14012
GTEx:  ENSG00000134072 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ14012
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on ATP

Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]
C10 H16 N5 O13 P3
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.198 
  • Space Group: P 63
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 83.415α = 90
b = 83.415β = 90
c = 153.372γ = 120
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-01-23
    Type: Initial release
  • Version 1.1: 2023-09-13
    Changes: Data collection, Database references, Derived calculations, Refinement description