Kinesin-1 (null)

Kinesin-1 is a highly conserved **ATP-dependent motor protein** that moves along microtubules, transporting membrane-bound organelles, vesicles, and protein complexes toward the microtubule plus ends, typically toward the cell periphery[1][3][8][9]. Structurally, it is a tetramer composed of two heavy chains (KHC) and two light chains (KLC). The **motor domain** of kinesin-1 hydrolyzes ATP and binds microtubules, converting chemical energy into mechanical work through a “hand-over-hand” walking mechanism, taking discrete 8-nm steps tightly linked to ATP turnover[8]. Kinesin-1 is regulated via an **autoinhibited conformation** stabilized by interactions between its head and tail domains and can be activated by cargo binding and microtubule association[3][5]. It plays a critical role in neuronal function, intracellular trafficking, and organelle positioning, and malfunction is implicated in neurodegeneration and other diseases[3][7][8][9]. Currently, Kinesin-1 serves mainly as a research target and cellular marker rather than a direct therapeutic target, but its essential biology makes it of high relevance in disease studies and potential future drug development.

Other names

Conventional kinesinKIF5 (including isoforms KIF5A, KIF5B, KIF5C)Kinesin heavy chainKHC

Most small-molecule probes (such as QPD-OTf) act as *substrates* or *activity reporters* for Kinesin-1 rather than as inhibitors or modulators for therapy[9]. Hypothetical inhibitors would block ATPase activity or interfere with microtubule binding, but none are clinically validated for Kinesin-1.