Folia Microbiologica

, 39:452 | Cite as

Overproduction of the hsd subunits leads to the loss of temperature-sensitive restriction and modification phenotype

  • M. Weiserová
  • P. Janščák
  • V. Zinkevich
  • J. Hubáček


The geneshsdM andhsdS for M.EcoKI modification methyltrasferase and the complete set ofhsdR,hsdM andhsdS genes coding for R.EcoKI restriction endonuclease, both with and without a temperature-sensitive (ts) mutation inhsdS gene, were cloned in pBR322 plasmid and introduced intoE. coli C (a strain without a natural restriction-modification (R-M) system). The strains producing only the methyltransferase, or together with the endonuclease, were thus obtained. ThehsdS ts-1 mutation, mapped previously in the distal variable region of thehsdS gene with C1 245-T transition has no effect on the R-M phenotype expressed from cloned genes in bacteria grown at 42°C. In clones transformed with the wholehsd region an alleviation of R-M functions was observed immediately after the transformation, but after subculture the transformants expressed the wild-type R-M phenotype irrespective of whether the wild-type or the mutanthsdS allele was present in the hybrid plasmid. Simultaneous overproduction of HsdS and HsdM subunits impairs the ts effect of thehsdS ts-1 mutation on restriction and modification.


Multicopy Plasmid Hybrid Plasmid Modification Phenotype Equilibrium Density Gradient Centrifuga hsdR Gene 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.





ethidium bromide




efficiency of plating


restriction and modification


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Copyright information

© Folia Microbiol 1994

Authors and Affiliations

  • M. Weiserová
    • 1
  • P. Janščák
    • 1
  • V. Zinkevich
    • 2
  • J. Hubáček
    • 1
  1. 1.Institute of MicrobiologyAcademy of Sciences of the Czech RepublicPrague
  2. 2.Biophysics Laboratories, School of Biological SciencesUniversity of PortsmouthPortsmouthUK

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