Calcium-binding protein. Binds one calcium ion per monomer (By similarity). Can promote differentiation of adipocytes (in vitro) (By similarity). Overexpression in preadipocytes increases their proliferation, enhances adipogenesis and reduces insulin-stimulated glucose uptake (By similarity). Homodimer (By similarity). Interacts with TP53 (By similarity). Primarily nucleolar. A high intracellular calcium level induces nucleolar exit and nucleocytoplasmic transport, whereas a low intracellular calcium level leads to nuclear translocation and accumulation within specific region of nucleoli. S100A16 proteins, but not other S100 proteins, have only one functional Ca(2+) binding site per monomer. Upon Ca(2+) binding, undergoes conformational changes leading to the exposure of hydrophobic patches which could be implicated in the Ca(2+)-dependent nuclear export. Binds Zn(2+). Ca(2+) and Zn(2+) do not bind to the same site. Does not bind Cu(2+). Belongs to the S-100 family.