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Isolation and Characterization of Glycolipids from Some Photosynthetic Bacteria

^a James Bryant Conant Laboratory, Harvard University, Cambridge, Massachusetts 02138

ABSTRACT

Glycosyl glycerides have been found in substantial amounts in Chloropseudomonas ethylicum but could not be detected in two strains of Rhodopseudomonas palustris. Rhodospirillum molischianum possibly contains small amounts of monoglycosyl diglyceride. The glycolipids of C. ethylicum have been separated into two components. One of these, glycolipid I, is a monogalactosyl diglyceride. Glycolipid II, upon acid hydrolysis, yields galactose, rhamnose, and a third, unidentified sugar. The glycolipids or total lipids of the photosynthetic bacteria examined contained saturated and monounsaturated, but none of the more highly unsaturated, fatty acids.

¹ Present address: National Institute of Neurological Diseases and Blindness, National Institutes of Health, Bethesda, Md. 20014.

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