This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Reprints and Permissions Copyright Information Books from ASM Press MicrobeWorld Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Craig, E. Articles by Gurgo, C. Search for Related Content PubMed PubMed Citation Articles by Craig, E. Articles by Gurgo, C.

 Previous Article  |  Next Article 

J Bacteriol. 1972 July; 111(1): 66-72
Copyright © 1972 American Society for Microbiology. All Rights Reserved.

Synthesis, No Synthesis, or Synthesis and Degradation of Ribosomal Ribonucleic Acid in Various Escherichia coli Strains Starved for an Amino Acid

¹ Department of Microbiology, Washington University School of Medicine, St. Louis, Missouri 63110

ABSTRACT

A standard stringent strain of Escherichia coli makes little or no ribosomal ribonucleic acid (RNA) during starvation for an essential amino acid, whereas the isogenic relaxed strain makes both ribosomal and messenger RNA. A third class of strains was found which continues to make ribosomal RNA during starvation, but the RNA made is apparently unstable. There is little accumulation of RNA in the third class of strains, and few complete newly formed chains of ³H-ribosomal RNA are observed in sedimentation analyses, even after long labeling times.