Annexin A13 Antibody

Annexin A13 (ANXA13), also known as Annexin XIII and Intestine-Specific Annexin, is a member of the Annexin protein family. Two isoforms have been identified resulting from alternate splicing. Isoform A consists of 316 amino acids and has a predicted molecular weight of 36 kDa whereas isoform B is composed of 357 amino acids and has a predicted molecular weight of 40 kDa. Annexins are a family of Calcium-dependent phospholipid-binding proteins that are preferentially located on the cytosolic face of the plasma membrane. The Annexin’s have a molecular weight of approximately 35 to 40 kDa and consist of a unique amino terminal domain followed by a homologous C-terminal core domain containing the calcium-dependent phospholipid-binding sites. The C terminal domain is comprised of four 60‑70 amino acid repeats, known as annexin repeats or an endonexin fold (Annexin A6 contains 8 annexin repeats). The four annexin repeats form a highly alpha -helical, tightly packed disc known as the annexin domain, which binds to phospholipids in the membrane in a calcium-dependent manner. Members of the annexin family play a role in cytoskeletal interactions, phospholipase inhibition, regulation of cellular growth, and intracellular signal transduction pathways. The specific function of Annexin A13 has not been determined but it is associated with the plasma membrane of undifferentiated, proliferating endothelial cells and differentiated villus enterocytes.