4pk4

Myosin VI motor domain in the PPS state - from a Pi release state crystal, space group P212121 after long soaking with PO4

spinqualitylabelsall models 4pk4, resolution 2.78Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4pk4 is a 1 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ADP, MG, PO4 Related: 4pfo Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed 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. How actin initiates the motor activity of Myosin.,Llinas P, Isabet T, Song L, Ropars V, Zong B, Benisty H, Sirigu S, Morris C, Kikuti C, Safer D, Sweeney HL, Houdusse A Dev Cell. 2015 May 26;33(4):401-12. doi: 10.1016/j.devcel.2015.03.025. Epub 2015 , Apr 30. PMID:25936506 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Myosin

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