UMMS Affiliation

Department of Microbiology; Department of Microbiology and Physiological Systems

Publication Date

1974-10-01

Document Type

Article

Disciplines

Bacteriology | Microbiology | Physiology

Abstract

Particulate preparations from sporulating cells of Bacillus sphaericus 9602 contained an endopeptidase activity that hydrolyzed the gamma-d-glutamyl-(l)meso-diaminopimelic acid linkages found in the spore cortical peptidoglycan of this organism. Diaminopimelic acid did not occur in the vegetative cell wall peptidoglycan, and the gamma-d-glutamyl-l-lysine linkages found in this polymer were not hydrolyzed by the endopeptidase. The endopeptidase hydrolyzed (X)-l-alanyl-gamma-d-glutamyl-(l)meso-diaminopimelyl(l)-d-alanyl-d-alanine only after removal of the terminal d-alanine residue. The preparations contained an acyl-d-alanyl-d-alanine carboxypeptidase I activity which converted such pentapeptides into substrates for the endopeptidase and which was inhibited 50% by 4 x 10(-7) M benzylpenicillin. This activity also hydrolyzed the analogous pentapeptide substrates containing l-lysine. The preparations also contained an acyl-l-lysyl-d-alanine carboxypeptidase II activity that was not active on the meso-diaminopimelic acid-containing analogue. Neither this activity nor the endopeptidase was inhibited by 10(-3) M benzylpenicillin. The specificities of the carboxypeptidases were consistent with the exclusive presence of l-lysine C-termini in the vegetative peptidoglycan and of meso-diaminopimelyl-d-alanine C-termini in the spore cortical peptidoglycan of B. sphaericus 9602.

Rights and Permissions

Copyright © 1974, American Society for Microbiology. Publisher PDF posted as allowed by the publisher's copyright policy at https://journals.asm.org/content/copyright-transfer-and-supplemental-material-license-agreement-2017.

Source

J Bacteriol. 1974 Oct;120(1):173-84. Link to article on publisher's website

Journal/Book/Conference Title

Journal of bacteriology

Related Resources

Link to Article in PubMed

PubMed ID

4417809

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