Title: Regulation of Polyamine Synthesis in Mammalian Cells
Abstract: Since the polyamines putrescine, spermidine and spermine are essential cellular components for growth and differentiation it is of no surprise that their synthesis is highly regulated. Disregarding arginase, which catalyzes the formation of ornithine, the rate-controlling steps in the biosynthesis of the polyamines are catalyzed by ornithine decarboxylase (ODC) and S-adenosylmethionine decarboxylase (AdoMetDC). Spermidine synthase and spermine synthase are present in relatively large amounts in cells and appear to be regulated by the supply of their substrates. Compared to the synthases the activities of ODC and AdoMetDC are very low, even when fully induced. Both ODC and AdoMetDC have remarkably fast turnover rates. In fact, they are among the shortest known for mammalian enzymes (1, 2).
Publication Year: 1988
Publication Date: 1988-01-01
Language: en
Type: review
Indexed In: ['crossref', 'pubmed']
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Cited By Count: 17
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