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. 1974 Jun;118(3):1144–1157. doi: 10.1128/jb.118.3.1144-1157.1974

Topology and Growth of the Intracytoplasmic Membrane System of Rhodopseudomonas spheroides: Protein, Chlorophyll, and Phospholipid Insertion into Steady-State Anaerobic Cells

M H Kosakowski a,1, S Kaplan a
PMCID: PMC246865  PMID: 4545399

Abstract

An equilibrium density gradient centrifugation study involving the separation of “old” and “new” membranes has been developed to determine the manner in which protein, lipid, and chlorophyll are incorporated into growing intracytoplasmic membranes (chromatophores) of Rhodopseudomonas spheroides. Chromatophores derived from cells grown in an H2O-medium had a density of 1.175 to 1.180 g/cm3 and were readily separable from chromatophores having a density of 1.220 to 1.230 isolated from cells grown in a 70% D2O-medium. After a shift from “D2O-” to “H2O”-based media, only hybrid chromatophores derived from a combination of “heavy” (old) and “light” (new) chromatophore material could be detected. The experimentally determined, median density values for the growing intracytoplasmic membrane system followed a theoretically determined profile which was calculated from the density of full “heavy” and full “light” material assuming random, homogeneous incorporation of new material into old membrane. The distribution of the radioactive labels for protein (leucine) and chlorophyll (delta-aminolevulinic acid) were identical and showed a reproducible displacement of the “old” material to the heavy side of the optical density at 365 nm (OD365) absorbance and a displacement of the “new” material to the light side of the OD365 absorbance profile. Specific phospholipid growth showed no displacement for either the “old” or “new” material from the median absorbance profile.

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Selected References

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