Deoxyribonucleic acid-envelope complexes isolated from Escherichia coli by free-flow electrophoresis: biochemical and electron microscope characterization
- PMID: 4597456
- PMCID: PMC246800
- DOI: 10.1128/jb.118.2.646-653.1974
Deoxyribonucleic acid-envelope complexes isolated from Escherichia coli by free-flow electrophoresis: biochemical and electron microscope characterization
Abstract
A procedure for the preparative isolation of Escherichia coli cell wall, membrane, and deoxyribonucleic acid (DNA)-envelope complex fragments has been developed. The envelope fragments were produced by controlled mechanical cell breakage and isolated by density gradient centrifugation and subsequent preparative free-flow electrophoresis. The DNA-envelope complex fragments were shown to contain biochemical markers of both the cell wall and the membrane and by electron microscopy to be cell envelope fragments containing wall/membrane adhesion zones.
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