May function as calcium sensor and contribute to cellular calcium signaling. In a calcium-dependent manner, functions by interacting with other proteins, such as EZR and PPP5C, and indirectly plays a role in physiological processes like the formation of microvilli in epithelial cells. May stimulate cell proliferation in an autocrine manner via activation of the receptor for activated glycation end products (RAGE). {ECO:0000269|PubMed:14617629, ECO:0000269|PubMed:19111582, ECO:0000269|PubMed:22399290}. This is the function of S100P (S100 calcium binding protein P, ENSG00000163993).