Long-range cooperative binding of kinesin to a microtubule in the presence of ATP.
Interaction of kinesin-coated latex beads with a single microtubule (MT) was directly observed by fluorescence microscopy. In the presence of ATP, binding of a kinesin bead to the MT facilitated the subsequent binding of other kinesin beads to an adjacent region on the MT that extended for micrometers in length. This cooperative binding was not observed in the presence of ADP or 5'-adenylylimidodiphosphate (AMP-PNP), where binding along the MT was random. Cooperative binding also was induced by an engineered, heterodimeric kinesin, WT/E236A, that could hydrolyze ATP, yet remained fixed on the MT in the presence of ATP. Relative to the stationary WT/E236A kinesin on a MT, wild-type kinesin bound preferentially in close proximity, but was biased to the plus-end direction. These results suggest that kinesin binding and ATP hydrolysis may cause a long-range state transition in the MT, increasing its affinity for kinesin toward its plus end. Thus, our study highlights the active involvement of MTs in kinesin motility.
Muto
Etsuko
E
Form and Function Group, PRESTO, JST, Mino, Osaka 562-0035, Japan. emuto@brain.riken.go.jp
Sakai
Hiroyuki
H
Kaseda
Kuniyoshi
K
D000255:Adenosine Triphosphate / Q000378:metabolism*; D000818:Animals; D001921:Brain / Q000378:metabolism; D002417:Cattle; D016547:Kinesins / Q000378:metabolism*; D008863:Microspheres; D008870:Microtubules / Q000378:metabolism*; D011485:Protein Binding
D000255:Adenosine Triphosphate; D016547:Kinesins
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