FEATURES

FAMILY

DESCRIPTION

Also known as S10A1_HUMAN, S100A1, S100A. Small calcium binding protein that plays important roles in several biological processes such as Ca(2+) homeostasis, chondrocyte biology and cardiomyocyte regulation (PubMed:12804600). In response to an increase in intracellular Ca(2+) levels, binds calcium which triggers conformational changes (PubMed:23351007). These changes allow interactions with specific target proteins and modulate their activity (PubMed:22399290). Regulates a network in cardiomyocytes controlling sarcoplasmic reticulum Ca(2+) cycling and mitochondrial function through interaction with the ryanodine receptors RYR1 and RYR2, sarcoplasmic reticulum Ca(2+)-ATPase/ATP2A2 and mitochondrial F1-ATPase (PubMed:12804600). Facilitates diastolic Ca(2+) dissociation and myofilament mechanics in order to improve relaxation during diastole (PubMed:11717446). Dimer of either two alpha chains, or two beta chains, or one alpha and one beta chain (PubMed:21296671). Also forms heterodimers with S100P (PubMed:15171681). Interacts with AGER (By similarity). Interacts with CAPZA1 (By similarity). Interacts with FKBP4 (PubMed:20188096). Interacts with RYR1 and RYR2 (PubMed:18650434). Interacts with CACYBP in a calcium-dependent manner (PubMed:12042313). Interacts with PPP5C (via TPR repeats); the interaction is calcium-dependent and modulates PPP5C activity (PubMed:22399290). Interacts with ATP2A2 and PLN in a Ca(2+)-dependent manner (PubMed:12804600). Interacts with mitochondrial F1-ATPase subunits ATP5F1A and ATP5F1B; these interactions increase F1-ATPase activity (By similarity).

EXTERNAL LINKS

S100A1

Protein S100-A1

S100A1

Molecular Synopsis