4UPU

Crystal structure of IP3 3-K calmodulin binding region in complex with Calmodulin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.34 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.189 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

A New Calmodulin Binding Motif for Inositol 1,4,5-Trisphosphate 3-Kinase Regulation.

Franco-Echevarria, E.Banos-Sanz, J.I.Monterroso, B.Round, A.Sanz-Aparicio, J.Gonzalez, B.

(2014) Biochem J 463: 319

  • DOI: 10.1042/BJ20140757
  • Primary Citation of Related Structures:  
    4UPU

  • PubMed Abstract: 
  • IP3-3K [Ins(1,4,5)P3 3-kinase] is a key enzyme that catalyses the synthesis of Ins(1,3,4,5)P4, using Ins(1,4,5)P3 and ATP as substrates. Both inositides, substrate and product, present crucial roles in the cell. Ins(1,4,5)P3 is a key point in Ca2+ metabo ...

    IP3-3K [Ins(1,4,5)P3 3-kinase] is a key enzyme that catalyses the synthesis of Ins(1,3,4,5)P4, using Ins(1,4,5)P3 and ATP as substrates. Both inositides, substrate and product, present crucial roles in the cell. Ins(1,4,5)P3 is a key point in Ca2+ metabolism that promotes Ca2+ release from intracellular stores and together with Ins(1,3,4,5)P4 regulates Ca2+ homoeostasis. In addition, Ins(1,3,4,5)P4 is involved in immune cell development. It has been proved that Ca2+/CaM (calmodulin) regulates the activity of IP3-3K, via direct interaction between both enzymes. Although we have extensive structural knowledge of the kinase domains of the three IP3-3K isoforms, no structural information is available about the interaction between IP3-3K and Ca2+/CaM. In the present paper we describe the crystal structure of the complex between human Ca2+/CaM and the CaM-binding region of human IP3-3K isoform A (residues 158-183) and propose a model for a complex including the kinase domain. The structure obtained allowed us to identify all of the key residues involved in the interaction, which have been evaluated by site-directed mutagenesis, pull-down and fluorescence anisotropy experiments. The results allowed the identification of a new CaM-binding motif, expanding our knowledge about how CaM interacts with its partners.


    Organizational Affiliation

    *Grupo de Cristalografía Macromolecular y Biología Estructural, Instituto de Química-Física "Rocasolano", CSIC, Serrano 119, 28006 Madrid, Spain.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CALMODULIN A148Homo sapiensMutation(s): 0 
Gene Names: CALM1CALMCAMCAM1
Find proteins for P0DP23 (Homo sapiens)
Explore P0DP23 
Go to UniProtKB:  P0DP23
NIH Common Fund Data Resources
PHAROS:  P0DP23
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
INOSITOL-TRISPHOSPHATE 3-KINASE A B26Homo sapiensMutation(s): 0 
Gene Names: ITPKA
EC: 2.7.1.127
Find proteins for P23677 (Homo sapiens)
Explore P23677 
Go to UniProtKB:  P23677
NIH Common Fund Data Resources
PHAROS:  P23677
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.34 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.189 
  • Space Group: I 4 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 159.48α = 90
b = 159.48β = 90
c = 159.48γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
MOLREPphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-08-20
    Type: Initial release
  • Version 1.1: 2014-09-10
    Changes: Other, Structure summary
  • Version 1.2: 2014-10-22
    Changes: Database references