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Key messageOryza sativa polyamine oxidase 1 back-converts spermine (or thermospermine) to spermidine. Considering the previous work, major path of polyamine catabolism in rice plant is suggestive to be back-conversion but not terminal catabolism. Abstract Rice (Oryza sativa) contains seven genes encoding polyamine oxidases (PAOs), termed OsPAO1 to OsPAO7, based on their chromosomal number...
Polyamine oxidases (PAOs) are FAD-dependent enzymes involved in polyamine (PA) catabolism. Recent studies have revealed that plant PAOs are not only active in the terminal catabolism of PAs as demonstrated for maize apoplastic PAO but also in a polyamine back-conversion pathway as shown for most Arabidopsis PAOs. We have characterized Oryza sativaPAOs at molecular and biochemical levels. The rice...
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