EF-III metal-binding site of CIB1
Protein DomainThe EF-III metal-binding site of calcium- and integrin-binding protein 1 (CIB1) is an EF-hand domain characterized as a mixed Mg2+/Ca2+-binding site. Mutational analysis of its metal-coordinating loop indicates that EF-III modulates CIB1 affinity for the integrin alphaIIb domain and tunes metal sensitivity into a range relevant to intracellular Ca2+ sensing.