4PJL image
Entry Detail
PDB ID:
4PJL
Keywords:
Title:
Myosin VI motor domain A458E mutant in the Pi release state, space group P212121 -
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2014-05-12
Release Date:
2015-04-29
Method Details:
Experimental Method:
Resolution:
2.10 Å
R-Value Free:
0.20
R-Value Work:
0.16
R-Value Observed:
0.16
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Unconventional myosin-VI
Mutations:yes
Chain IDs:A
Chain Length:788
Number of Molecules:1
Biological Source:Sus scrofa
Primary Citation
How actin initiates the motor activity of Myosin.
Dev.Cell 33 401 412 (2015)
PMID: 25936506 DOI: 10.1016/j.devcel.2015.03.025

Abstact

Fundamental to cellular processes are directional movements driven by molecular motors. A common theme for these and other molecular machines driven by ATP is that controlled release of hydrolysis products is essential for using the chemical energy efficiently. Mechanochemical transduction by myosin motors on actin is coupled to unknown structural changes that result in the sequential release of inorganic phosphate (Pi) and MgADP. We present here a myosin structure possessing an actin-binding interface and a tunnel (back door) that creates an escape route for Pi with a minimal rotation of the myosin lever arm that drives movements. We propose that this state represents the beginning of the powerstroke on actin and that Pi translocation from the nucleotide pocket triggered by actin binding initiates myosin force generation. This elucidates how actin initiates force generation and movement and may represent a strategy common to many molecular machines.

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