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Dihydrotentoxin: A precursor of tentoxin or its degradation product?
Author(s) -
Liebermann B.,
Ihn W.
Publication year - 1988
Publication title -
journal of basic microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.58
H-Index - 54
eISSN - 1521-4028
pISSN - 0233-111X
DOI - 10.1002/jobm.3620280109
Subject(s) - fermentation , chemistry , mycelium , alternaria alternata , biochemistry , phytotoxin , peptide , biology , botany , toxin
Besides tentoxin, dihydrotentoxin is produced by Alternaria alternata in similar quantities. Both peptides are excreted mainly into the culture medium, with a low content (20–55 μg/g) being found in the mycelium already of an early stage of fermentation. Tentoxin is not degraded during cultivation, therefore, dihydrotentoxin cannot be a decomposition product of the phytotoxin. During the isolation procedure, some tentoxin (10 to 15%) and even more dihydrotentoxin (30–40%) is lost. Incorporation of labelled dihydrotentoxin ( 14 C, 15 N) into tentoxin during fermentation allows the conclusion that the nonoxidized peptide is the precusor of tentoxin.