Arch Microbiol. 1975 Nov 7;105(3):269-75.

Cytoplasmic and outer membranes separation in Rhodopseudomonas sphaeroides.

Abstract

A cell envelope fraction had been prepared after mechanical disruption of lysozyme-EDTA spheroplasts from depigmented Rhodopseudomonas sphaeroides (aerobically grown in the light). On linear sucrose gradients this fraction can be separated in a cytoplasmic membrane fraction and an outer membrane fraction. The cytoplasmic fraction (buoyant density: 1.18 g/cm3) has been characterized by its succinic dehydrogenase activity and by its composition. The outer membrane fraction (buoyant density: 1.21 g/cm3) does not contain any respiratory activity nor hemoproteins. The same fractionation has been done on cells repigmented in the dark by lowering the O2 pressure. In that case the same two fractions have been detected in addition to the chromatophore fraction (buoyant density: 1.14 g/cm3). However both, and specially the outer membrane fraction, were contaminated by chromatophore material.

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Cytoplasmic and outer membranes separation in Rhodopseudomonas sphaeroides.

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