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. 1968 Jan;106(1):49–59. doi: 10.1042/bj1060049

The cell wall of Bacillus licheniformis N.C.T.C. 6346. Isolation of low-molecular-weight fragments from the soluble mucopeptide

R C Hughes 1
PMCID: PMC1198468  PMID: 5721471

Abstract

1. Soluble mucopeptide was prepared by lysozyme treatment of acid-extracted walls of Bacillus licheniformis N.C.T.C. 6346 and separated into fractions differing in molecular size by chromatography on Sephadex G-25 and G-50. 2. About 16% of the weight of soluble mucopeptide has a weight-average molecular weight in excess of 20000. About one half has a weight-average molecular weight of less than 2000 and the balance of soluble mucopeptide is of intermediate size. 3. In the mucopeptide fractions isolated from Sephadex there is a correlation between the weight-average molecular weight, the number of non-reducing muramic acid residues and the proportion of diaminopimelic acid residues recovered after treatment with 1-fluoro-2,4-dinitrobenzene. 4. The extent of cross-linking between peptide side chains is relatively low, even in mucopeptide material of the large molecular size. 5. The small amount of residual phosphorus present in preparations of B. licheniformis soluble mucopeptide remains associated mainly with mucopeptide material of large molecular size. 6. The mucopeptide components of lowest molecular weight are not produced as artifacts during the preparation of soluble mucopeptide, but are apparently incorporated in the insoluble mucopeptide present in walls of exponentially growing cells. 7. Soluble mucopeptide isolated in a complex with acidic polymers after lysozyme treatment of walls of B. licheniformis N.C.T.C. 6346 and Bacillus subtilis W23 retains a high molecular weight when the covalent bonds between mucopeptide and the acidic polymers are broken. 8. Pure fragments were isolated from B. licheniformis soluble mucopeptide. A major component, C1, of the material of smallest size is made up of one residue each of N-acetylglucosamine, N-acetylmuramic acid, l-alanine, glutamic acid and diaminopimelic acid. The N-acetylglucosamine is in β-glycosidic linkage with a reducing N-acetylmuramic acid residue. The peptide unit is probably amidated. A quantitatively minor component, C2, has amino acid and amino sugar composition identical with that of component C1, but probably lacks an amide group. Another fragment, B1, is made up of two molecules of component C1 or C2 that are joined together through a molecule of d-alanine.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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