Homospermidine synthase (HSS) catalyzes the synthesis of the polyamine homospermidine from 2 mol putrescine in an NAD(+)-dependent reaction. In this study, the enzyme was purified from anaerobically grown cultures of the photosynthetic bacterium Rhodopseudomonas viridis to electrophoretic
The enzyme homospermidine synthase catalyzes the NAD+-dependent conversion of 2 mol putrescine into homospermidine. Instead of putrescine, spermidine can substitute for the first putrescine moiety in plants, in which case diaminopropane instead of ammonia is released. The enzyme facilitates the
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