Necessary for signaling by class 3 semaphorins and subsequent remodeling of the cytoskeleton (By similarity). Plays a role in axon guidance (By similarity). During the axon guidance process, acts downstream of SEMA3A to promote FLNA dissociation from F-actin which results in the rearrangement of the actin cytoskeleton and the collapse of the growth cone (By similarity). Involved in invasive growth and cell migration. May participate in cytokinesis (By similarity). Homotetramer, and heterotetramer with DPYSL2, DPYSL3, DPYSL4 or DPYSL5 (By similarity). Interacts with PLXNA1 (By similarity). Interacts with FLNA (via calponin-homology (CH) domain 1 and filamin repeat 24); the interaction alters FLNA ternary structure and thus promotes FLNA dissociation from F-actin (PubMed:25358863). Associated with centrosomes and the mitotic spindle during metaphase (By similarity). Colocalizes with FLNA and tubulin in the central region of DRG neuron growth cone. Following SEMA3A stimulation of DRG neurons, colocalizes with F-actin (By similarity). Expressed in the brain of 20 dpc embryos. Phosphorylation at Ser-522 enhances CRMP1-mediated alteration of FLNA ternary structure and FLNA dissociation from F-actin. Belongs to the metallo-dependent hydrolases superfamily. Hydantoinase/dihydropyrimidinase family. Lacks most of the conserved residues that are essential for binding the metal cofactor and hence for dihydropyrimidinase activity. Its enzyme activity is therefore unsure.