功能Plays a role in the export of proteins that lack a signal peptide and are secreted by an alternative pathway. Binds two calcium ions per subunit. Binds one copper ion. Binding of one copper ion does not interfere with calcium binding. Required for the copper-dependent stress-induced export of IL1A and FGF1. The calcium-free protein binds to lipid vesicles containing phosphatidylserine, but not to vesicles containing phosphatidylcholine.
组织特异性Expressed in heart and skeletal muscle.
序列相似性Belongs to the S-100 family. Contains 2 EF-hand domains.
细胞定位Cytoplasm. Secreted. Secretion is mediated by exposure to stress and requires copper ions.