2DFS

3-D structure of Myosin-V inhibited state


Experimental Data Snapshot

  • Method: ELECTRON CRYSTALLOGRAPHY
  • Resolution: 24 Å
  • Aggregation State: TISSUE 
  • Reconstruction Method: TOMOGRAPHY 

wwPDB Validation 3D Report Full Report


This is version 1.2 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: 10.1038/nature04719

  • 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 s ...

    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

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Myosin-5A
A, M
1080Gallus gallusGene Names: MYO5A
Find proteins for Q02440 (Gallus gallus)
Go to Gene View: MYO5A
Go to UniProtKB:  Q02440
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Calmodulin
B, C, D, E, F, G, N, O, P, Q, R, S
148Mus musculusGene Names: Calm2 (Cam2, CamC)
Find proteins for P0DP27 (Mus musculus)
Go to UniProtKB:  P0DP27
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON CRYSTALLOGRAPHY
  • Resolution: 24 Å
  • Aggregation State: TISSUE 
  • Reconstruction Method: TOMOGRAPHY 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-04-25
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance