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Exocellular ß-Lactamases of Streptomyces albusG and Strains R39 and K11
- Source :
- Antimicrobial Agents and Chemotherapy; February 1973, Vol. 3 Issue: 2 p289-298, 10p
- Publication Year :
- 1973
-
Abstract
- The ß-lactamases excreted by the highly benzylpenicillin-susceptible Streptomycesstrain R39 and the highly benzylpenicillin-resistant Streptomyces albusG were isolated and purified. Neither ß-lactamase exhibited dd-carboxypeptidase activity. Both were anionic at pH 8.3, did not require metal ions, and were not sensitive to iodine, but were inhibited by Cu2+and readily inactivated by heat. p-Chloromercuribenzoate, iodoacetate, p-aminobenzoate, and substrates and inhibitors of dd-carboxypeptidase had no effect on ß-lactamase activity. The Kmand Vmaxvalues for ß-lactamase activity were studied with 6-aminopenicillanic acid and with various penicillins and cephalosporins. The ß-lactamase from the related strain K11 of Streptomyces, which is intermediate in its susceptibility to benzylpenicillin, was partially purified, and its activity was compared on the various substrates.
Details
- Language :
- English
- ISSN :
- 00664804 and 10986596
- Volume :
- 3
- Issue :
- 2
- Database :
- Supplemental Index
- Journal :
- Antimicrobial Agents and Chemotherapy
- Publication Type :
- Periodical
- Accession number :
- ejs57064346
- Full Text :
- https://doi.org/10.1128/AAC.3.2.289