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- W2069114512 abstract "1) The ATP binding and crossbridge dissociation in muscle fibres is as fast as in solution, has a Q10 ca. 2-3, and is not measurably strain sensitive. 2) The final ADP release from the AM.ADP state achieved by adding ADP to rigor fibres must be greater than or equal to 69 sec-1 at 10 degrees C, and the combination of this rate and the ADP rebinding rate at 1 mM ADP limits the ATP induced crossbridge dissociation rate at greater than 2 mM ATP, but these kinetics were not strain sensitive. The strain sensitive steps must occur earlier on the attached pathway. 3) On activation, the equatorial changes thought to reflect crossbridge attachment are faster than tension production. The 10 intensity may change slightly ahead of the 11. This rate was not very temperature sensitive unlike the tension producing step in the mechanism. 4) The re-equilibration of equatorial intensity levels was much faster on activation from the rigor state than from the relaxed state. We conclude that crossbridges do not necessarily move far from the thin filaments when they detach in a fully activated thin filament system. 5) The 14.3 nm meridional intensity increases greater than 200% on fibre activation at 24 degrees C. The structural reorganisation of the heads responsible for this increase is associated with the tension generating step in the ATPase mechanism rather than the initial binding of bridges." @default.
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- W2069114512 date "1991-01-01" @default.
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- W2069114512 title "Dynamic X-ray diffraction measurements following photolytic relaxation and activation of skinned rabbit psoas fibres" @default.
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- W2069114512 doi "https://doi.org/10.1016/0065-227x(91)90008-2" @default.
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