Grancalcin is a protein that in humans is encoded by the GCAgene.
This gene product, grancalcin, is a calcium-binding protein abundant in neutrophils and macrophages. It belongs to the penta-EF-hand subfamily of proteins which includes sorcin, calpain, and ALG-2. Grancalcin localization is dependent upon calcium and magnesium. In the absence of divalent cation, grancalcin localizes to the cytosolic fraction; with magnesium alone, it partitions with the granule fraction; and in the presence of magnesium and calcium, it associates with both the granule and membrane fractions, suggesting a role for grancalcin in granule-membrane fusion and degranulation.
12Hansen C, Tarabykina S, la Cour JM, Lollike K, Berchtold MW (Jun 2003). "The PEF family proteins sorcin and grancalcin interact in vivo and in vitro". FEBS Lett. 545 (2–3): 151–4. doi:10.1016/S0014-5793(03)00518-0. PMID12804766. S2CID42572647.
Jia J, Borregaard N, Lollike K, Cygler M (2002). "Structure of Ca(2+)-loaded human grancalcin". Acta Crystallogr. D. 57 (Pt 12): 1843–9. doi:10.1107/S0907444901016511. PMID11717497.
Jia J, Han Q, Borregaard N, etal. (2000). "Crystal structure of human grancalcin, a member of the penta-EF-hand protein family". J. Mol. Biol. 300 (5): 1271–81. doi:10.1006/jmbi.2000.3925. PMID10903868.