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Spectral characterization of light reducible cytochrome in a plasma membrane enriched fraction and in other membranes from cauliflower brassica oleracea inflorescences

, : Spectral characterization of light reducible cytochrome in a plasma membrane enriched fraction and in other membranes from cauliflower brassica oleracea inflorescences. Photochemistry & Photobiology 38(1): 95-98

Low temperature spectroscopy has been used to characterize microsomal fractions obtained from cauliflower inflorescences (B. oleracea L.) by differential centrifugation and partition in an aqueous polymer 2-phase system. The plasma membrane-enriched fraction (U3) contained 1 dominant b-cytochrome, which could be reduced both by blue light and by dithionite. An action spectrum of the blue light-induced absorbance change [LIAC, .DELTA.(A430-A410)] associated with the reversible reduction of this b-type cytochrome indicated that the primary light-receptor was a flavin-like compound. Another microsomal fraction (L3) containing membranes from mitochondria, endoplasmic reticulum and other organelles also contained light-reducible cytochrome. One of these could be identified as cytochrome c oxidase, and another may be identical to cytochrome b5 of the endoplasmic reticulum.

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