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Polyamines are ubiquitous cellular components that are involved in normal and neoplastic growth. Polyamine biosynthesis is very highly regulated in mammalian cells by the activities of two key decarboxylases acting on ornithine and S-adenosylmethionine. Recent studies, which include crystallographic analysis of the recombinant human proteins, have provided a detailed knowledge of their structure and...
Background: S-Adenosylmethionine decarboxylase (AdoMetDC) is a critical regulatory enzyme of the polyamine synthetic pathway, and a well-studied drug target. The AdoMetDC decarboxylation reaction depends upon a pyruvoyl cofactor generated via an intramolecular proenzyme self-cleavage reaction. Both the proenzyme-processing and substrate-decarboxylation reactions are allosterically enhanced by putrescine...
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