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. 1973 Oct;116(1):410–417. doi: 10.1128/jb.116.1.410-417.1973

Chemical Analysis of the Outer Membrane and Other Layers of the Cell Envelope of Acinetobacter sp

Kareen J I Thorne 1, Margaret J Thornley 1, Audrey M Glauert 1
PMCID: PMC246437  PMID: 4745422

Abstract

Chemical analysis of fractions of the cell envelope of Acinetobacter sp. strain MJT/F5/199A, prepared by breakage in the French press and removal of plasma membranes, followed by sequential treatment with lysozyme and with papain, confirmed the existence of layers previously identified by electron microscopy. Outside the plasma membrane and periplasmic space, the envelope is composed of (i) a peptidoglycan-containing dense layer, (ii) an intermediate layer, (iii) a lipopolysaccharide-containing outer membrane, and (iv) an ordered array of protein subunits. A small amount of carbohydrate (3%) is found associated with protein in the fraction containing both the surface subunits and the intermediate layer. The papain-treated outer membranes contain 67% protein, 24% lipid, together with 11% lipopolysaccharide, and about 6% of non-lipopolysaccharide hexosamine. Lipid is located only in the papain-treated outer-membrane and is mainly phospholipid: 29% phosphatidyl glycerol, 30% phosphatidyl ethanolamine, and 40% cardiolipin. The principal fatty acid is C18:1. Significant amounts of alcohols16:1 and alcohols18:1, which are found in Acinetobacter waxes, were recovered from the outer membrane.

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Selected References

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