Abstract
Suspension cultured Nicotiana tabacum (tobacco) cells grow slowly on intermediates of the purine degradation pathway (hypoxanthine, xanthine, uric acid, allantoin, and urea) as their sole nitrogen source indicating that this degradation pathway is operative in these cells. The hypoxanthine analog, allopurinol inhibited tobacco cell growth on hypoxanthine but not uric acid. This helps confirm that the site of action of allopurinol is the conversion of hypoxanthine to uric acid by xanthine oxidase. Attempts to select cells which could grow in the presence of allopurinol with hypoxanthine as the nitrogen source were not successful.
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