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. 1979 Jun;138(3):896–902. doi: 10.1128/jb.138.3.896-902.1979

In vivo regulation of chromosomal beta-lactamase in Escherichia coli.

B Jaurin, S Normark
PMCID: PMC218119  PMID: 378945

Abstract

Chromosomal beta-lactamase, a periplasmic enzyme of Escherichia coli, was studied with respect to its regulation in vivo. Both the activity and the amount of beta-lactamase increased with growth rate. During a nutritional shift-down, chromosomal beta-lactamase activity followed stable ribonucleic acid accumulation. After a nutritional shift-up the differential rate of beta-lactamase synthesis did not increase immediately (like stable ribonucleic acid), but did increase after a lag period of 30 min. To determine whether beta-lactamase was under stringent control, strains carrying a temperature-sensitive valyl-transfer ribonucleic acid synthetase and differing only in the allelic state of the relA gene were shifted from a permissive to a semipermissive temperature. No influence by the relA gene product was found on beta-lactamase synthesis. The regulation of this periplasmic enzyme is discussed in relation to that of some components of the translational apparatus.

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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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