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Appl Environ Microbiol. 1988 June; 54(6): 1602-1605

Identification of an anthraquinone pigment and a hydroxystilbene antibiotic from Xenorhabdus luminescens.

Department of Chemistry, San Diego State University, California 92812.

ABSTRACT

The entomopathogenic bacterium Xenorhabdus luminescens produces a red pigment and an antibiotic in insect carcasses in which it grows and in axenic cultures. The pigment was purified and identified as the anthraquinone derivative 1,6-dihydroxy-4-methoxy-9,10-anthraquinone, which exhibits a pH-sensitive color change, i.e., it is yellow below pH 9 and red above pH 9. The antibiotic was also purified and identified as the hydroxystilbene derivative 3,5-dihydroxy-4-isopropylstilbene.

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