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Sir: As part of a broad program on the genetics of Streptomyces coelicolor A3(2)1), RUDD and HOPWOOD2) carried out genetic studies on a nondiffusible red mycelial pigment produced by this organism. By UV irradiation of strain B18, a mutant blocked in the synthesis of the diffusible pigment actinorhodin3), they obtained a series of redmutants. These all mapped in a narrow region of the chromosome and were divided into 5 mutant classes based on cosynthesis studies. Class A served as a converter to B, C and E, classes B and C gave red pigment production in mixed culture an j each served r as secretor to A, as did class E, and class D showed no cosynthesis with any other class. Additional genetic work on this system has been reported by FEITELSON and HOPWOOD4). In the present note we report on the chemical nature of the red pigment.

Identification of a red pigment from Streptomyces coelicolor A3(2) as a mixture of prodigiosin derivatives.