De Matteis F, Gibbs A H
Biochem J. 1977 Jan 15;162(1):213-6. doi: 10.1042/bj1620213.
Cobalt inhibits liver haem synthesis in vivo by acting at least two different sites in the biosynthetic pathway: (1) synthesis of 5-aminolaevulinate and (2) conversion of 5-amino-laevulinate into haem. The first effect is largely, if not entirely, due to inhibition of the activity of 5-aminolaevulinate synthase, rather than to inhibition of the formation of the enzyme. The second effect results from diversion of 5-aminolaevulinate into an unidentified liver pool with solubility properties similar to those of cobalt protoporphyrin.
(1)5-氨基酮戊酸的合成,以及(2)5-氨基酮戊酸向血红素的转化。第一种作用在很大程度上(如果不是完全的话)是由于抑制了5-氨基酮戊酸合酶的活性,而不是抑制该酶的形成。第二种作用是由于5-氨基酮戊酸转移到一个未明确的肝脏池,其溶解性与钴原卟啉相似。