4PJK image
Entry Detail
PDB ID:
4PJK
Keywords:
Title:
Dicty myosin II R238E.E459R mutant (with ADP.Pi) in the Pi release state
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2014-05-12
Release Date:
2015-04-29
Method Details:
Experimental Method:
Resolution:
2.15 Å
R-Value Free:
0.21
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
C 2 2 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Myosin-2 heavy chain
Mutations:R238E, E459R
Chain IDs:A
Chain Length:769
Number of Molecules:1
Biological Source:Dictyostelium discoideum
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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