毒理性
秋水仙素结合肌动蛋白,阻止其解聚并毒害细胞。它们特异性地结合在F-actin亚单位之间的界面上,将相邻的亚单位锁定在一起。这导致肌动蛋白亚单元从丝状末端解离的速率常数降低,实际上通过防止丝状解聚来稳定肌动蛋白丝。此外,它们还抑制了F-actin的ATP水解活性。
Phallotoxins bind actin, preventing its depolymerization and poisoning the cell. They bind specifically at the interface between F-actin subunits, locking adjacent subunits together. This leads to a decrease in the rate constant for the dissociation of actin subunits from filament ends, which essentially stabilizes actin filaments through the prevention of filament depolymerization. Moreover, they inhibit the ATP hydrolysis activity of F-actin. (L1183, A2465)
来源:Toxin and Toxin Target Database (T3DB)