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. 1963 Oct 11;142(3589):234-5.
doi: 10.1126/science.142.3589.234.

CYTOCHROMES OF A BLUE-GREEN ALGA: EXTRACTION OF A C-TYPE WITH A STRONGLY NEGATIVE REDOX POTENTIAL

R W HOLTON, J MYERS

CYTOCHROMES OF A BLUE-GREEN ALGA: EXTRACTION OF A C-TYPE WITH A STRONGLY NEGATIVE REDOX POTENTIAL

R W HOLTON et al. Science. .

Abstract

Aqueous extraction of lyophilized Anacystis nidulans cells followed by chromatography on diethylaminoethyl cellulose separates three different c-type cytochromes. Of the two present in highest concentration, cytochrome-554 has a + 0.35-volt redox potential and resembles the cytochrome f of other photosynthetic tissues, while cytochrome-549 has a -0.26-volt potential. The possible participatidn of cytochrome-549 in electron transport in photosynthesis in this alga at a more negative oxidation-reduction potential than previously postulated for any cytochrome is inferred from the similarities in its spectra to the light-induced spectral changes in vivo observed by others.

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