Negative interference dominates collective transport of kinesin motors in the absence of load
文献情報
Arthur R. Rogers, Jonathan W. Driver, Pamela E. Constantinou, D. Kenneth Jamison
The collective function of motor proteins is known to be important for the directed transport of many intracellular cargos. However, understanding how multiple motors function as a group remains challenging and requires new methods that enable determination of both the exact number of motors participating in motility and their organization on subcellular cargos. Here we present a biosynthetic method that enables exactly two kinesin-1 molecules to be organized on linear scaffolds that separate the motors by a distance of 50 nm. Tracking the motions of these complexes revealed that while two motors produce longer average run lengths than single kinesins, the system effectively behaves as though a single-motor attachment state dominates motility. It is proposed that negative motor interference derived from asynchronous motor stepping and the communication of forces between motors leads to this behavior by promoting the rapid exchange between different microtubule-bound configurations of the assemblies.
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