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Phytol and Bacteriochlorophyll Synthesis in Rhodopseudomonas spheroides¹

^a Department of Bacteriology, University of California, Los Angeles, California 90024

Phytol has been separated and identified in the unsaponifiable lipid fraction from wild type Rhodopseudomonas spheroides, but it was not detected in mutant strains blocked at various stages of bacteriochlorophyll synthesis. Incorporation of ¹⁴C-acetate into phytol paralleled bacteriochlorophyll synthesis in suspensions of the wild type incubated anaerobically in the light. The addition of chloramphenicol inhibited both processes. It is concluded that phytol formation is tightly coupled to the synthesis of the pyrrole component of bacteriochlorophyll.

¹ This work was supported by grants from the National Science Foundation (GB 14967) and the National Institutes of Health (5 ROI AM 11148).

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