Component of the centralspindlin complex that serves as a microtubule-dependent and Rho-mediated signaling required for the myosin contractile ring formation during the cell cycle cytokinesis. Essential for cytokinesis in Rho-mediated signaling. Required for the localization of ECT2 to the central spindle. Plus-end-directed motor enzyme that moves antiparallel microtubules in vitro (By similarity). Heterotetramer of two molecules each of RACGAP1 and KIF23. Found in the centralspindlin complex. Interacts with RACGAP1; the interaction is direct. Interacts with ECT2 and PRC1. Interacts with ANXA11 during cytokinesis. Interacts with BIRC6/bruce and USP8/UBPY (By similarity). Interacts with ARF6, forming heterodimers and heterotetramers. Localizes to the interzone of mitotic spindles (By similarity). Detected at the midbody during later stages of mitotic cytokinesis. Detected in testis and ovary from newborn mice (at protein level). Detected in brain, spinal cord and small intestine. Ubiquitinated. Deubiquitinated by USP8/UBPY (By similarity). Belongs to the TRAFAC class myosin-kinesin ATPase superfamily. Kinesin family.