PMID: 6539583Apr 1, 1984Paper

Pentaketide metabolites of melanin synthesis in the dematiaceous fungus Wangiella dermatitidis

Archives of Microbiology
P A GeisPaul J Szaniszlo

Abstract

Melanin synthesis in the dematiaceous, polymorphic hyphomycete Wangiella dermatitidis, a human pathogen, was investigated by biochemical and physiological techniques. Mutants with a decrease or loss in melanin synthesis were induced and isolated. Melanin precursors were obtained from the mutants, purified, and then identified by comparison with authentic compounds from Verticillium dahliae . Isolation of scytalone , vermelone , flaviolin , and 1,8- dihydroxynaphthalene from the mutants of Wangiella dermatitidis, and cross-feeding of the mutants with those of Verticillium dahliae indicated that melanin synthesis in this organism took place by the pentaketide pathway. Melanin that formed in cell walls of an albino mutant treated with scytalone was identified in appearance to that in cell walls of the wild-type strain. This also suggested that pentaketide synthesis of melanin occurred in the fungus.

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