title: Biotransformation of 2-benzoxazolinone and 2-hydroxy-1,4-benzoxazin-3-one by endophytic fungi isolated from Aphelandra tetragona.
abstract: The biotransformation of the phytoanticipins 2-benzoxazolinone (BOA) and 2-hydroxy-1,4-benzoxazin-3-one (HBOA) by four endophytic fungi isolated from Aphelandra tetragona was studied. Using high-performance liquid chromatography-mass spectrometry, several new products of acylation, oxidation, reduction, hydrolysis, and nitration were identified. Fusarium sambucinum detoxified BOA and HBOA to N-(2-hydroxyphenyl)malonamic acid. Plectosporium tabacinum, Gliocladium cibotii, and Chaetosphaeria sp. transformed HBOA to 2-hydroxy-N-(2-hydroxyphenyl)acetamide, N-(2-hydroxyphenyl)acetamide, N-(2-hydroxy-5-nitrophenyl)acetamide, N-(2-hydroxy-3-nitrophenyl)acetamide, 2-amino-3H-phenoxazin-3-one, 2-acetylamino-3H-phenoxazin-3-one, and 2-(N-hydroxy)acetylamino-3H-phenoxazin-3-one. BOA was not degraded by these three fungal isolates. Using 2-hydroxy-N-(2-hydroxyphenyl)[(13)C(2)]acetamide, it was shown that the metabolic pathway for HBOA and BOA degradation leads to o-aminophenol as a key intermediate.
mesh_terms: D027901:Acanthaceae / Q000382:microbiology*; D019659:Asteraceae / Q000382:microbiology*; D048588:Benzoxazines; D001583:Benzoxazoles / Q000737:chemistry / Q000378:metabolism*; D001711:Biotransformation; D006999:Hypocreales / Q000254:growth & development / Q000302:isolation & purification / Q000378:metabolism*; D010078:Oxazines / Q000737:chemistry / Q000378:metabolism*
chemical_list: C436752:2-hydroxy-1,4-benzoxazin-3-one; D048588:Benzoxazines; D001583:Benzoxazoles; D010078:Oxazines; C017057:benzoxazolone