1OQP

STRUCTURE OF THE CA2+/C-TERMINAL DOMAIN OF CALTRACTIN IN COMPLEX WITH THE CDC31P-BINDING DOMAIN FROM KAR1P


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 60 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations,structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Unique Features in the C-terminal Domain Provide Caltractin with Target Specificity

Hu, H.T.Chazin, W.J.

(2003) J.Mol.Biol. 330: 473-484


  • PubMed Abstract: 
  • Caltractin (centrin) is a member of the calmodulin (CaM) superfamily of EF-hand calcium-binding proteins. It is an essential component of the centrosomal structures in a wide range of organisms. Caltractin and calmodulin apparently function in distin ...

    Caltractin (centrin) is a member of the calmodulin (CaM) superfamily of EF-hand calcium-binding proteins. It is an essential component of the centrosomal structures in a wide range of organisms. Caltractin and calmodulin apparently function in distinct calcium signaling pathways despite substantial sequence similarity. In an effort to understand the structural basis for such differences, the high-resolution three-dimensional solution structure of the complex between the Ca(2+)-activated C-terminal domain of Chlamydomonas reinhardtii caltractin (CRC-C) and a 19 residue peptide fragment comprising the putative cdc31p-binding region of Kar1p (K(19)) has been determined by multi-dimensional heteronuclear NMR spectroscopy. Formation of the complex is calcium-dependent and is stabilized by extensive interactions between CRC-C and three key hydrophobic anchors (Trp10, Leu13 and Leu14) in the peptide as well as favorable electrostatic interactions at the protein-peptide interface. In-depth comparisons have been made to the structure of the complex of Ca(2+)-activated calmodulin and R(20), the CaM-binding domain of smooth muscle myosin light-chain kinase. Although the overall structures of CRC and CaM domains in their respective complexes are very similar, differences in critical regions in the sequences of these proteins and their targets lead to clear differences in the complementarity of their respective binding surfaces. These subtle differences reveal the structural basis for the Ca(2+)-dependent regulation of distinct cellular signaling events by CRC and CaM.


    Organizational Affiliation

    Departments of Biochemistry and Physics, Center for Structural Biology, Vanderbilt University, 5142 BIOSCI/MRBIII, Nashville, TN 37232-8725, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Caltractin
A
77Chlamydomonas reinhardtiiMutation(s): 0 
Find proteins for P05434 (Chlamydomonas reinhardtii)
Go to UniProtKB:  P05434
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Cell division control protein KAR1
B
19Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: KAR1
Find proteins for P11927 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P11927
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 60 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations,structures with the lowest energy 
  • Olderado: 1OQP Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2003-03-10 
  • Released Date: 2003-06-24 
  • Deposition Author(s): Hu, H.T., Chazin, W.J.

Revision History 

  • Version 1.0: 2003-06-24
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance