2DFS

3-D structure of Myosin-V inhibited state


Experimental Data Snapshot

  • Method: ELECTRON CRYSTALLOGRAPHY

Starting Models: experimental
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This is version 1.4 of the entry. See complete history


Literature

Three-dimensional structure of the myosin V inhibited state by cryoelectron tomography

Liu, J.Taylor, D.W.Krementsova, E.B.Trybus, K.M.Taylor, K.A.

(2006) Nature 442: 208-211

  • DOI: https://doi.org/10.1038/nature04719
  • Primary Citation of Related Structures:  
    2DFS

  • PubMed Abstract: 

    Unconventional myosin V (myoV) is an actin-based molecular motor that has a key function in organelle and mRNA transport, as well as in membrane trafficking. MyoV was the first member of the myosin superfamily shown to be processive, meaning that a single motor protein can 'walk' hand-over-hand along an actin filament for many steps before detaching. Full-length myoV has a low actin-activated MgATPase activity at low [Ca2+], whereas expressed constructs lacking the cargo-binding domain have a high activity regardless of [Ca2+] (refs 5-7). Hydrodynamic data and electron micrographs indicate that the active state is extended, whereas the inactive state is compact. Here we show the first three-dimensional structure of the myoV inactive state. Each myoV molecule consists of two heads that contain an amino-terminal motor domain followed by a lever arm that binds six calmodulins. The heads are followed by a coiled-coil dimerization domain (S2) and a carboxy-terminal globular cargo-binding domain. In the inactive structure, bending of myoV at the head-S2 junction places the cargo-binding domain near the motor domain's ATP-binding pocket, indicating that ATPase inhibition might occur through decreased rates of nucleotide exchange. The actin-binding interfaces are unobstructed, and the lever arm is oriented in a position typical of strong actin-binding states. This structure indicates that motor recycling after cargo delivery might occur through transport on actively treadmilling actin filaments rather than by diffusion.


  • Organizational Affiliation

    The Institute of Molecular Biophysics, Florida State University, Tallahassee, Florida 32306-4380, USA.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Myosin-5AA,
H [auth M]
1,080Gallus gallusMutation(s): 0 
UniProt
Find proteins for Q02440 (Gallus gallus)
Explore Q02440 
Go to UniProtKB:  Q02440
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UniProt GroupQ02440
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Calmodulin148Mus musculusMutation(s): 0 
UniProt
Find proteins for P0DP26 (Mus musculus)
Explore P0DP26 
Go to UniProtKB:  P0DP26
Entity Groups  
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UniProt GroupP0DP26
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON CRYSTALLOGRAPHY
  • Space Group: P 6
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 653α = 90
b = 653β = 90
c = 200γ = 120
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONPROTOMO

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-04-25
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-12-18
    Changes: Author supporting evidence, Data collection, Database references
  • Version 1.4: 2024-03-13
    Changes: Data collection, Database references, Refinement description