Human/Mouse/Rat CIB1 Alexa Fluor™ Plus 555-conjugated Antibody

CIB1 (Calcium and Integrin-Binding protein 1; also calmyrin, KIP and CIBP) is a 22-23 kDa, Ca⁺⁺-binding member of the CIB family of proteins. It is widely expressed, being found in neurons, platelets/megakaryocytes, skeletal muscle myocytes and lymphocytes. CIB1 is associated with the cytosolic side of the plasma membrane, and has multiple binding partners, including InsP₃R, GPIIb/ alphaIIb, presenilin 2, and NBR1 plus FEZ. When CIB1 binds InsP₃R, this ER-embedded receptor is both activated, and later desensitized to subsequent ligand binding. Relative to GPIIb, CIB1 interaction with the alphaIIb beta₃ integrin on platelets following thrombin exposure appears to inhibit integrin activation, thus providing a tight control on subsequent platelet binding to fibrinogen. Human CIB1 is 191 amino acids (aa) in length. It contains a utilized myristoylation site at Gly2, followed by two EF-hand domains (aa 103-183). CIB1 is suggested to act as a monomer. There is at least one potential isoform variant that shows a 40 aa insertion after Lys29. Full-length human CIB1 (aa 1-191) shares 94% aa sequence identity with mouse CIB1.