Function
Flavoenzyme involved in polyamine back-conversion (PubMed:24550437, PubMed:24906355, PubMed:26973665, PubMed:28199662). Catalyzes the oxidation of the secondary amino group of polyamines, such as spermine and its acetyl derivatives (PubMed:24550437, PubMed:24906355, PubMed:28199662). Substrate preference is spermine > N(1)-acetylspermine > thermospermine > norspermine (PubMed:24550437). Plays an important role in the regulation of polyamine intracellular concentration (PubMed:24550437, PubMed:26973665, PubMed:28199662). Involved in xylem differentiation by controlling thermospermine homeostasis, and participating in the tightly controlled interplay between auxin and cytokinin that is necessary for proper xylem differentiation (PubMed:28199662). Involved in the production of hydrogen peroxide in response to salt and cold stresses (PubMed:26973665).
Sequence
MAKKARIVIIGAGMAGLTAANKLYTSSNNTFELSVVEGGSRIGGRINTSEFSSEKIEMGATWIHGIGGSPVYRIAKETGSLVSDEPWECMDSTIDKAKTFAEGGFEIEPSIVESISGLFTALMELAQGKEISQSDADLSRLAHIYETATRVCSKGSSTSVGSFLKSGFDAYWDSISNGGEEGVKGYGKWSRKSLEEAIFTMFSNTQRTYTSADELSTLDFAAESEYQMFPGEEITIAKGYLSVIHHLASVLPQGVIQLNRKVTKIEWQSNEVKLHFSDGSVVFADHVIVTVSLGVLKAGIETDAELFSPPLPDFKSDAIRRLGYGVVNKLFVEMSQRKFPSLQLVFDREDSEFRFVKIPWWMRRTATITPIHSNSKVLLSWFAGKEALELEKLTDEEIKDAVMTTISCLTGKEVKNDTAKPLTNGSLNDDDEAMKITKVLKSKWGSDPLFRGSYSYVAVGSSGDDLDAMAEPLPKINKKVGQVNGHDQAKVHELQVMFAGEATHRTHYSTTHGAYYSGLREANRLLKHYKCNF