1N2D

Ternary complex of MLC1P bound to IQ2 and IQ3 of Myo2p, a class V myosin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.208 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structure of the light chain-binding domain of myosin V.

Terrak, M.Rebowski, G.Lu, R.C.Grabarek, Z.Dominguez, R.

(2005) Proc Natl Acad Sci U S A 102: 12718-12723

  • DOI: 10.1073/pnas.0503899102
  • Primary Citation of Related Structures:  
    1N2D

  • PubMed Abstract: 
  • Myosin V is a double-headed molecular motor involved in organelle transport. Two distinctive features of this motor, processivity and the ability to take extended linear steps of approximately 36 nm along the actin helical track, depend on its unusua ...

    Myosin V is a double-headed molecular motor involved in organelle transport. Two distinctive features of this motor, processivity and the ability to take extended linear steps of approximately 36 nm along the actin helical track, depend on its unusually long light chain-binding domain (LCBD). The LCBD of myosin V consists of six tandem IQ motifs, which constitute the binding sites for calmodulin (CaM) and CaM-like light chains. Here, we report the 2-A resolution crystal structure of myosin light chain 1 (Mlc1p) bound to the IQ2-IQ3 fragment of Myo2p, a myosin V from Saccharomyces cerevisiae. This structure, combined with FRET distance measurements between probes in various CaM-IQ complexes, comparative sequence analysis, and the previously determined structures of Mlc1p-IQ2 and Mlc1p-IQ4, allowed building a model of the LCBD of myosin V. The IQs of myosin V are distributed into three pairs. There appear to be specific cooperative interactions between light chains within each IQ pair, but little or no interaction between pairs, providing flexibility at their junctions. The second and third IQ pairs each present a light chain, whether CaM or a CaM-related molecule, bound in a noncanonical extended conformation in which the N-lobe does not interact with the IQ motif. The resulting free N-lobes may engage in protein-protein interactions. The extended conformation is characteristic of the single IQ of myosin VI and is common throughout the myosin superfamily. The model points to a prominent role of the LCBD in the function, regulation, and molecular interactions of myosin V.


    Related Citations: 
    • Crystallisation, X-ray Characterixation and Selenomethionine Phasing of Mlc1p Bound to IQ motifs from Myosin V
      Terrak, M., Otterbein, L.R., Wu, W., Palecanda, L.A., Lu, R.C., Dominguez, R.
      (2002) Acta Crystallogr D Biol Crystallogr 58: 1882

    Organizational Affiliation

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



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
IQ2 AND IQ3 MOTIFS FROM MYO2P, A CLASS V MYOSINC48N/AMutation(s): 0 
Find proteins for P19524 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P19524 
Go to UniProtKB:  P19524
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Myosin Light ChainAB148Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: MLC1
Find proteins for P53141 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P53141 
Go to UniProtKB:  P53141
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.208 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 80.017α = 90
b = 64.24β = 90
c = 72.785γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
Shakemodel building
SnBphasing
MLPHAREphasing
CNSrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-11-04
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description