1M45

CRYSTAL STRUCTURE OF MLC1P BOUND TO IQ2 OF MYO2P, A CLASS V MYOSIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.191 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Two distinct myosin light chain structures are induced by specific variations within the bound IQ motifs-functional implications

Terrak, M.Wu, G.Stafford, W.F.Lu, R.C.Dominguez, R.

(2003) Embo J. 22: 362-371

  • DOI: 10.1093/emboj/cdg058
  • Primary Citation of Related Structures:  1M46

  • PubMed Abstract: 
  • IQ motifs are widespread in nature. Mlc1p is a calmodulin-like myosin light chain that binds to IQ motifs of a class V myosin, Myo2p, and an IQGAP-related protein, Iqg1p, playing a role in polarized growth and cytokinesis in Saccharomyces cerevisiae. ...

    IQ motifs are widespread in nature. Mlc1p is a calmodulin-like myosin light chain that binds to IQ motifs of a class V myosin, Myo2p, and an IQGAP-related protein, Iqg1p, playing a role in polarized growth and cytokinesis in Saccharomyces cerevisiae. The crystal structures of Mlc1p bound to IQ2 and IQ4 of Myo2p differ dramatically. When bound to IQ2, Mlc1p adopts a compact conformation in which both the N- and C-lobes interact with the IQ motif. However, in the complex with IQ4, the N-lobe no longer interacts with the IQ motif, resulting in an extended conformation of Mlc1p. The two light chain structures relate to two distinct subfamilies of IQ motifs, one of which does not interact with the N-lobes of calmodulin-like light chains. The correlation between light chain structure and IQ sequence is demonstrated further by sedimentation velocity analysis of complexes of Mlc1p with IQ motifs from Myo2p and Iqg1p. The resulting 'free' N-lobes of myosin light chains in the extended conformation could mediate the formation of ternary complexes during protein localization and/or partner recruitment.


    Related Citations: 
    • Crystallisation, X-ray characterization and selenomethionine phasing of Mlc1p bound to IQ motifs from myosin V
      Terrak, M.,Otterbein, L.R.,Wu, G.,Palecanda, L.A.,Lu, R.C.,Dominguez, R.
      (2002) Acta Crystallogr.,Sect.D 58: 1882


    Organizational Affiliation

    Boston Biomedical Research Institute, 64 Grove Street, Watertown, MA 02472, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Myosin light chain
A
148Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Gene Names: MLC1
Find proteins for P53141 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to Gene View: MLC1
Go to UniProtKB:  P53141
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
IQ2 Motif from MYO2P, A Class V Myosin
B
25Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Gene Names: MYO2 (CDC66)
Find proteins for P19524 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P19524
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.191 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 43.594α = 90.00
b = 56.455β = 90.00
c = 56.928γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
REFMACrefinement
HKL-2000data collection
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-02-11
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance