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- W2078973394 abstract "The surface of freeze-etched E. coli strain GR467, a heptose-deficient (deep rough) mutant derived from CR34, was studied by electron microscopy. The outer membrane of GR467 has an increased ratio of phospholipid to protein, mainly due to a decreased protein content. Freeze-etched CR34 showed structural features indistinguishable for wild-type E. coli, i.e., the primary cleavage occurring in the inner membrane with only minor appearance of cleavage within the outer membrane. In contrast to this, in mutant GR467 most of the freeze-cleavages had taken place along a new plane, presumably in a hydrophobic region of the outer membrane. In this cleavage plane numerous particles were seen. Often the cleavage extended over the entire exposed cell surface; occasionally only a few large plateaus were visible, around which the next deeper cleavage plane, that of the protoplasmic or inner membrane, was discernible. Two spontaneous revertants (R11 and R16) with protein and lipid A levels similar to wild-type cells showed mostly freeze fractures with wild-type characteristics, and only a few cells had retained fracturing properties of GR467. A partial revertant revealed intermediate characteristics. Thus, there appears to be a morphological correlation with the chemical data relating the amount of outer membrane protein with the heptose content of the lipopolysaccharide." @default.
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- W2078973394 date "1975-12-01" @default.
- W2078973394 modified "2023-10-14" @default.
- W2078973394 title "Alterations in envelope structure of heptose-deficient mutants of Escherichia coli as revealed by freeze-etching." @default.
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- W2078973394 doi "https://doi.org/10.1073/pnas.72.12.5145" @default.
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