Studies on Energy and Electron Transfer Systems in the Green Photosynthetic Bacterium <i>Chloropseudomonas ethylica</i> Strain 2-K:II. Composition of Pigments and Electron Transfer Systems

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The composition of photosynthetic pigments and electron transfer components in the cells of Chloropseudomonas ethylica strain 2-K was investigated.<br> The cells of C. ethylica contained, per mg protein, 97.8 nmoles of chlorobium chlorophyll-660 (bacteriochlorophyll c), 5.7 nmoles of bacteriochlorophyll a, 0.064 nmole of reaction center chlorophyll (P840), 1.69 nmoles of total heme proteins (heme basis), 26.3 nmoles of total non-heme iron, 0.59 nmole of total acid-extractable flavins, and 4.9 nmoles of menaquinone. There are approximately 1, 530 molecules of chlorobium chlorophyll-660 and 89 molecules of bacteriochlorophyll a per molecule of the reaction center pigment (P840). The high chlorophyll content may be an adaptation to the low light intensity habitat of this organism.<br> The cells contained approximately 0.63 nmole of cytochrome c-551.5 and approximately 1.06 nmoles of cytochrome c-555 (550) (both on a heme basis) per mg protein. Cytochrome c-551.5 was less firmly bound to cellular structures than cytochrome c-555 (550). There was no indication of the presence of cytochrome c-553 or B-type cytochrome in the reduced-minus-oxidized difference spectra or in the pyridine hemochrome spectra of whole cell, particle or soluble fractions. The mode of reduction of cytochrome c-555 (550) by sodium ascorbate was significantly different in the free and bound states.

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