Collapsin response mediator protein 3 is an enzyme that in humans is encoded by the CRMP3 gene.It is necessary for signaling by class 3 semaphorins and subsequent remodeling of the cytoskeleton.And plays a role in axon guidance, neuronal growth cone collapse and cell migration.Homotetramer, and heterotetramer with CRMP1, DPYSL2, DPYSL3 or DPYSL5. Interacts with PLEXA1. Phosphorylated upon DNA damage, probably by ATM or ATR.