Coreceptor for SEMA3A and SEMA6A. Necessary for signaling by SEMA6A and class 3 semaphorins and subsequent remodeling of the cytoskeleton. Plays a role in axon guidance, invasive growth and cell migration. Class 3 semaphorins bind to a complex composed of a neuropilin and a plexin. The plexin modulates the affinity of the complex for specific semaphorins, and its cytoplasmic domain is required for the activation of down-stream signaling events in the cytoplasm. Homodimer. Interacts with RND1 (By similarity). Interacts directly with NRP1 and NRP2. The PLXNA2 homodimer interacts with a SEMA6A homodimer, giving rise to a heterotetramer. Belongs to the plexin family. Truncated N-terminus. Truncated N-terminus.