PORPHYRIN COMPOUNDS DERIVED FROM BACTERIA

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Abstract
The pigment contained in the extracts obtained from B. phosphorescens by freezing and thawing, and in the alkaline extracts of B. phosphorescens and yeast, resembles the "cytochrome c" of Hill and Keilin (6) and the "porphyratin B" of Schumm (7) in giving absorption bands at mµ 552-550 and 522-520) but shows in addition a band about 575, as in the "hemochromogen A" obtained by Keilin (3) by prolonged treatment of yeast with strong alkali. Like cytochrome c the pigment of yeast extracts appears to be distinct from the ordinary hemochromogen of blood, because of the difference in position of the bands of the native materials and of the corresponding pyridine hemochromogens. On treatment with acetic acid, however, the yeast extract yields α-hematin, as identified spectroscopically. It is evident then that one portion of its iron-porphyrin nucleus is identical with α-hematin (iron-protoporphyrin), which must be present not as such, but in chemical combination.

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