Heat Modifiability and Detergent Solubility of Outer Membrane Proteins of Rhodopseudomonas Sphaeroides

Overview

Journal J Bacteriol

Publisher American Society for Microbiology

Specialty Microbiology

Date 1983 Nov 1

PMID 6605339

Citations 3

Authors

N E KENT

B J Wisnieski

Affiliations

Soon will be listed here.

Abstract

The outer membrane fraction from Rhodopseudomonas sphaeroides was isolated by isopycnic density centrifugation. The purity of this fraction was assayed by several methods. When the outer membrane fraction obtained after French press lysis of cells was compared with the outer membrane fragments released during spheroplast formation, the polypeptide profiles were identical. Detergent solubilization of membrane fractions showed that Triton X-100 nonselectively solubilizes both the cytoplasmic membrane and the outer membrane, whereas Deriphat 160 selectively solubilizes the cytoplasmic membrane. Several outer membrane polypeptides, including the major outer membrane protein, exhibited changes in electrophoretic mobility that depended upon the temperature of solubilization in sodium dodecyl sulfate. Solubilization at room temperature in the presence of ions reproduced the effect of thermal denaturation on the major outer membrane polypeptide.

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