Milton N G
Department of Molecular Pathology, Royal Free and University College Medical School, University College London, Royal Free Campus, Rowland Hill Street, London NW3 2PF, U.K.
Biochem J. 1999 Dec 1;344 Pt 2(Pt 2):293-6.
Amyloid-beta (Abeta) specifically bound purified catalase with high affinity and inhibited catalase breakdown of H(2)O(2). The Abeta-induced catalase inhibition involved formation of the inactive catalase Compound II and was reversible. Catalase<-->Abeta interactions provide rapid functional assays for the cytotoxic domain of Abeta and suggest a mechanism for some of the observed actions of Abeta plus catalase in vitro.
β淀粉样蛋白(Aβ)以高亲和力特异性结合纯化的过氧化氢酶,并抑制过氧化氢酶对H₂O₂的分解。Aβ诱导的过氧化氢酶抑制作用涉及无活性的过氧化氢酶化合物II的形成,且是可逆的。过氧化氢酶与Aβ的相互作用为Aβ的细胞毒性结构域提供了快速功能测定方法,并提示了体外观察到的Aβ加过氧化氢酶某些作用的机制。