Kinesin is a microtubule-associated force-producing protein that may play a role in organelle transport. The light chain may function in coupling of cargo to the heavy chain or in the modulation of its ATPase activity (By similarity). Oligomeric complex composed of two heavy chains and two light chains. Interacts with SPAG9. Interacts with ATCAY; may link mitochondria to KLC1 and regulate mitochondria localization into neuron projections. Interacts (via TPR repeats) with TOR1A; the interaction associates TOR1A with the kinesin oligomeric complex. Interacts with BORCS5. Interacts with MAPK8IP3/JIP3 and NTRK2/TRKB; interaction with NTRK2/TRKB is mediated by MAPK8IP3/JIP3 (By similarity). Belongs to the kinesin light chain family. It is uncertain whether Met-1 or Met-5 is the initiator.