Molecular and General Genetics MGG

, Volume 174, Issue 1, pp 25–32 | Cite as

Characterization of 10S RNA: A new stable RNA molecule from Escherichia coli

  • Bimal K. Ray
  • David Apirion
Article

Summary

When cells of Escherichia coli are labeled with 32Pi for long periods of time and the cell content is subjected to electrophoresis in polyacrylamide gels, an RNA band appears which is about 10S in size. This band seems to contain three conformers. After treatment with formamide only a single band appears in this region of the gel, which contains 550 nucleotides as determined from its mobility. The complexity of the fingerprint of this material, after digestion with T1-RNase, is in agreement with the size as determined by the mobility, this confirming that indeed it is a single molecule. Composition of the T1-oligonucleotides was determined by digesting the T1-generated oligonucleotides with pancreatic RNase and T2-RNase. The quantitative and qualitative analysis of these digestions suggests that 10S RNA contains 609 nucleotides. The molecule contains, besides the four regular bases, one copy per molecule of the modified base pseudouridine.

10S RNA cannot be processed by cell extracts to tRNA-sized molecules and does not bind significantly to ribosomes, hence it is unlikely to be a tRNA precursor or an mRNA.

Keywords

Escherichia Coli Nucleotide Qualitative Analysis Electrophoresis Polyacrylamide 

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Copyright information

© Springer-Verlag 1979

Authors and Affiliations

  • Bimal K. Ray
    • 1
  • David Apirion
    • 1
  1. 1.Department of Microbiology and Immunology, Division of Biology and Biomedical SciencesWashington University Medical SchoolSt. LouisUSA

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