1GGW

CDC4P FROM SCHIZOSACCHAROMYCES POMBE


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 26 
  • Selection Criteria: LEAST RESTRAINT VIOLATION 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of Cdc4p, a contractile ring protein essential for cytokinesis in Schizosaccharomyces pombe.

Slupsky, C.M.Desautels, M.Huebert, T.Zhao, R.Hemmingsen, S.M.McIntosh, L.P.

(2001) J.Biol.Chem. 276: 5943-5951

  • DOI: 10.1074/jbc.M008716200

  • PubMed Abstract: 
  • The Schizosaccharomyces pombe Cdc4 protein is required for the formation and function of the contractile ring, presumably acting as a myosin light chain. By using NMR spectroscopy, we demonstrate that purified Cdc4p is a monomeric protein with two st ...

    The Schizosaccharomyces pombe Cdc4 protein is required for the formation and function of the contractile ring, presumably acting as a myosin light chain. By using NMR spectroscopy, we demonstrate that purified Cdc4p is a monomeric protein with two structurally independent domains, each exhibiting a fold reminiscent of the EF-hand class of calcium-binding proteins. Although Cdc4p has one potentially functional calcium-binding site, it does not bind calcium in vitro. Three variants of Cdc4p containing single point mutations responsible for temperature-sensitive arrest of the cell cycle at cytokinesis (Gly-19 to Glu, Gly-82 to Asp, and Gly-107 to Ser) were also characterized by NMR and circular dichroism spectroscopy. In each case, the amino acid substitution only leads to small perturbations in the conformation of the protein. Furthermore, thermal unfolding studies indicate that, like wild-type Cdc4p, the three mutant forms are all extremely stable, remaining completely folded at temperatures significantly above those causing failure of cytokinesis in intact cells. Therefore, the altered phenotype must arise directly from a disruption of the function of Cdc4p rather than indirectly through a disruption of its overall structure. Several mutant alleles of Cdc4p also show interallelic complementation in diploid cells. This phenomenon can be explained if Cdcp4 has more than one essential function or, alternatively, if two mutant proteins assemble to form a functional complex. Based on the structure of Cdc4p, possible models for interallelic complementation including interactions with partner proteins and the formation of a myosin complex with Cdc4p fulfilling the role of both an essential and regulatory light chain are proposed.


    Related Citations: 
    • Cdc4p, a Contractile Ring Protein Essential for Cytokinesis in Schizosaccharomyces pombe, Interacts with a Phosphatidylinositol 4-Kinase
      Desautels, M.,Den Haese, J.P.,Slupsky, C.M.,McIntosh, L.P.,Hemmingsen, S.M.
      (2001) J.Biol.Chem. 276: 5932


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (CDC4P)
A
140Schizosaccharomyces pombe (strain 972 / ATCC 24843)Gene Names: cdc4
Find proteins for Q09196 (Schizosaccharomyces pombe (strain 972 / ATCC 24843))
Go to UniProtKB:  Q09196
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 26 
  • Selection Criteria: LEAST RESTRAINT VIOLATION 
  • Olderado: 1GGW Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-03-21
    Type: Initial release
  • Version 1.1: 2008-04-26
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance