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• W1990529462 endingPage "616" @default.
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• W1990529462 abstract "During the recovery stroke, the myosin motor is primed for the next power stroke by a 60 degree rotation of its lever arm. This reversible motion is coupled to the activation of the ATPase function of myosin through conformational changes along the relay helix, which runs from the Switch-2 loop near the ATP to the converter domain carrying the lever arm. Via a hydrogen bond between the side-chain of Asn475 on the relay helix and the Gly457/Ser456 peptide group on the Switch-2, the rotation of the converter domain is coupled to the formation of a hydrogen bond between Gly457 and gamma-phosphate that is essential for ATP hydrolysis. Here, molecular dynamics simulations of Dictyostelium discoideum myosin II in the two end conformations of the recovery stroke with different nucleotide states (ATP, ADP x Pi, ADP) reveal that the side-chain of Asn475 breaks away from Switch-2 upon ATP hydrolysis to make a hydrogen bond with Tyr573. This sensing of the nucleotide state is achieved by a small displacement of the cleaved gamma-phosphate towards Gly457 which in turn pushes Asn475 away. The sensing plays a dual role by (i) preventing the wasteful reversal of the recovery stroke while the nucleotide is in the ADP x Pi state, and (ii) decoupling the relay helix from Switch-2, thus allowing the power stroke to start upon initial binding to actin while Gly457 of Switch-2 keeps interacting with the Pi (known to be released only later after tight actin binding). A catalytically important salt bridge between Arg238 (on Switch-1) and Glu459 (on Switch-2), which covers the hydrolysis site, is seen to form rapidly when ATP is added to the pre-recovery stroke conformer and remains stable after the recovery stroke, indicating that it has a role in shaping the ATP binding site by induced fit." @default.
• W1990529462 created "2016-06-24" @default.
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• W1990529462 date "2006-08-01" @default.
• W1990529462 modified "2023-10-09" @default.
• W1990529462 title "Simulations of the Myosin II Motor Reveal a Nucleotide-state Sensing Element that Controls the Recovery Stroke" @default.
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• W1990529462 doi "https://doi.org/10.1016/j.jmb.2006.06.022" @default.
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