The inhibitory effect of sinefungin on juvenile hormone biosynthesis and development in locusts
نویسندگان
چکیده
The antibiotic fungal metabolite sinefungin is a potent inhibitor of S-adenosylmethionineacceptor methyltransferases. Its effect on insect metabolism and especially on corpora allata farnesoic acid methyltransferase, which catalyzes the penultimate step of juvenile hormone biosynthesis, was investigated in Locusta migratoria. Injection of sinefungin results in a delay of imaginal molt and in suppression of ovary development. Isolated corpora allata are unable to synthesize juvenile hormone III in the presence of more than 1.0 mM sinefungin. In a cell-free system containing the S-adenosylmethionine-dependent farnesoic acid methyltransferase from corpora allata sinefungin is a competitive inhibitor of the synthesis of methylfarnesoate with AT, of 1 /iM. Key Word Index: Locust, sinefungin, O-methyltransferase, juvenile hormone biosynthesis
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