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. 1970 Aug;118(5):859–868. doi: 10.1042/bj1180859

Autolysis of cell walls of Bacillus stearothermophilus B65 and the chemical structure of the peptidoglycan

W D Grant 1, A J Wicken 1
PMCID: PMC1179297  PMID: 4248963

Abstract

1. The cell walls of Bacillus stearothermophilus B65 contain glucosamine, muramic acid, alanine, α∈-diaminopimelic acid (Dap), glutamic acid, aspartic acid, glycine, and serine in the molecular proportions 0.60:0.64:2.30:0.85:1.00:0.11:0.13:0.31. 2. Both d- and l-alanine are present, but glutamic acid and diaminopimelic acid are present only as the d- and meso-isomers respectively. 3. The peptide fragments Ala-Dap, Dap-Ala, and Dap-Ala-Dap have been isolated from a partial acid hydrolysate of the cell walls. 4. The major products of autolysis of the cell wall were d-alanine, a peptide mixture, peptidoglycan material and a peptidoglycan–teichoic acid complex. 5. Separation of the peptide mixture into ten major peptides was achieved by DEAE-Sephadex and paper chromatography, and paper electrophoresis. 6. The structures of these peptides have been determined and they fall into four groups, the individual members of each group differing only in number or position of carboxamide substituents. 7. The structures are I, a tripeptide l-Ala–d-Glu-meso-Dap; II, a pentapeptide made up by the tripeptide (I) linked through the ∈-amino group of its diaminopimelic acid residue to the carboxyterminal of the dipeptide meso-Dap-d-Ala; III, a heptapeptide made up by a similar linkage between the tripeptide (I) and the tetrapeptide l-Ala-d-Glu-meso-Dap-d-Ala; IV, a possible undecapeptide made up by a further tetrapeptide similarly linked to the heptapeptide (III) structure. 8. The structure of the peptidoglycan and the actions of the autolytic enzymes are discussed in terms of these peptide structures.

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Selected References

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