Model for the Structure of the Shape-Maintaining Layer of the Escherichia coli Cell Envelope (original) (raw)

Abstract

The surface area per repeating murein unit (i.e. per molecule of diaminopimelate) has been determined for the cell envelopes of the Escherichia coli strains K-12 and W. This area was constantly found to be 1.3 nm2. Using this value and other previously determined properties of E. coli murein, a three-dimensional model of murein is proposed. The model specifies a monomolecular layer in which disaccharide units are each 1.03 nm long, and the polysaccharide chains, all parallel, are 1.25 nm apart. The cross-linking peptide side-chains have the same atomic coordinates and are arranged above or below the polysaccharide chains.

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Selected References

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