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- W4233155180 abstract "NTPases use a metal ion, typically Mg2+, coordinated by a conserved serine or threonine residue, to enable phosphate binding and catalysis. Now cysteine substitutions at the switch 1 motif of different kinesins render them able to use Mn2+ instead of Mg2+, allowing their enzymatic and motor activities to be modulated by the ratio of Mg2+ to Mn2+. Kinesins are molecular motors that require a divalent metal ion (for example, Mg2+) to convert the energy of ATP hydrolysis into directed force production along microtubules. Here we present the crystal structure of a recombinant kinesin motor domain bound to Mn2+ and ADP and report on a serine-to-cysteine substitution in the switch 1 motif of kinesin that allows its ATP hydrolysis activity to be controlled by adjusting the ratio of Mn2+ to Mg2+. This mutant kinesin binds ATP similarly in the presence of either metal ion, but its ATP hydrolysis activity is greatly diminished in the presence of Mg2+. In human kinesin-1 and kinesin-5 as well as Drosophila melanogaster kinesin-10 and kinesin-14, this defect is rescued by Mn2+, providing a way to control both the enzymatic activity and force-generating ability of these nanomachines." @default.
- W4233155180 created "2022-05-12" @default.
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- W4233155180 date "2011-12-25" @default.
- W4233155180 modified "2023-10-11" @default.
- W4233155180 title "A metal switch for controlling the activity of molecular motor proteins" @default.
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- W4233155180 doi "https://doi.org/10.1038/nsmb.2190" @default.
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