Molecular and General Genetics MGG

, Volume 185, Issue 1, pp 142–147

Genetic mapping of a mutation in Escherichia coli leading to a temperature-sensitive RNase D

  • Richard Zaniewski
  • Murray R. Deutscher

DOI: 10.1007/BF00333804

Cite this article as:
Zaniewski, R. & Deutscher, M.R. Molec Gen Genet (1982) 185: 142. doi:10.1007/BF00333804


In order to determine the metabolic role of RNase D in Escherichia coli, we have attempted to isolate strains deficient in this enzyme. One strain containing a temperature-sensitive RNase D was found among a heavily mutagenized stock of strains temperature-sensitive for growth. Genetic mapping of the mutation responsible for the altered RNase D enabled us to define the rnd locus, at 39.5–40.0 min on the E. coli map, which apparently specifies the RNase D structural gene. Using a Tn10 insertion near the rnd locus, we constructed isogenic strains containing RNase D and RNase II mutations, alone or in combination. Although the original mutant isolate displayed temperature-sensitive growth, no growth phenotype was associated with the rnd mutation in wild type background, possibly because a substantial amount of RNase D remained in cells grown at 45° C. However, elucidation of the map position of the rnd locus should prove useful for the isolation of other mutant strains with lower levels of RNase D.

Copyright information

© Springer-Verlag 1982

Authors and Affiliations

  • Richard Zaniewski
    • 1
  • Murray R. Deutscher
    • 1
  1. 1.Department of BiochemistryUniversity of Connecticut, Health CenterFarmingtonUSA

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