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. 1993 Feb;175(4):1043–1052. doi: 10.1128/jb.175.4.1043-1052.1993

Identification of endonucleolytic cleavage sites involved in decay of Escherichia coli trxA mRNA.

C Arraiano 1, S D Yancey 1, S R Kushner 1
PMCID: PMC193018  PMID: 7679384

Abstract

The degradation of individual mRNAs in Escherichia coli has been studied through the use of a multiple mutant carrying the pnp-7 (polynucleotide phosphorylase), rnb-500 (RNase II), and rne-1 (RNase E) alleles. In this triple mutant, discrete mRNA breakdown products are stabilized in vivo at the nonpermissive temperature (Arraiano, C. M., S. D. Yancey, and S. R. Kushner, J. Bacteriol. 170:4625-4633, 1988). In the case of thioredoxin (trxA) mRNA decay, degradation fragments accumulated at early times after a shift to the nonpermissive temperature. Using Northern (RNA) blots, S1 nuclease analysis, and primer extensions, we identified a series of specific endonucleolytic cleavage sites that occur throughout the transcript in both the triple mutant and a wild-type control. The implications of the complex decay patterns observed are discussed.

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