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J Bacteriol. 1973 June; 114(3): 1264-1270
Copyright © 1973 American Society for Microbiology. All Rights Reserved.

Model for the Structure of the Shape-Maintaining Layer of the Escherichia coli Cell Envelope

Volkmar Braun1, Helga Gnirke, Ulf Henning and Kurt Rehn

a Max-Planck-Institut für Biologie, Tübingen, Germany

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.

FOOTNOTES

1 Present address: Max-Planck-Institut für Molekulare Genetik, 1000 Berlin 33 (Dahlem), Germany.

J Bacteriol. 1973 June; 114(3): 1264-1270
Copyright © 1973 American Society for Microbiology. All Rights Reserved.



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