Maurocalcin

UniProtKB accession:  P60254

Grouped By:  Matching UniProtKB accession

UniProtKB description:  This toxin stabilizes ryanodine receptor 1 (RyR1) opening in a long-lasting subconductance state (48%-60% of the full conductance state) (PubMed:10713267, PubMed:12869557, PubMed:27114612). Furthermore, it triggers calcium release from sarcoplasmic vesicles (6.6 nM are enough to induce a sharp release, and 60% of the total calcium is released after toxin (100 nM) addition) probably by acting as a cell-penetrating peptide (CPP) (PubMed:27114612). In addition, it has been shown to dose-dependently stimulate ryanodine binding to RyR1 (EC(50)=12.5-26.4 nM) (PubMed:12869557, PubMed:17291197, PubMed:17888395, PubMed:27114612). It also augments the bell-shaped calcium-[3H]ryanodine binding curve that is maximal at about 10 uM calcium concentration (PubMed:27114612). It binds a different site as ryanodine (PubMed:10713267). It acts synergistically with caffeine (By similarity). In vivo, intracerebroventricular injection into mice causes death (PubMed:10713267).