Summary
The Streptomyces albus G genes (salR and salM) for the class II restriction enzyme SalI (SalGI) and its cognate modification enzyme were cloned in Streptomyces lividans 66. Selection was initially for the salR gene. From a library of S. albus G DNA in the high copy number plasmid pIJ486 several clones of S. lividans were obtained that were resistant to phage ϕC31 unmodified at the many SalI sites in its DNA, but were sensitive to modified phages last propagated on a restriction-deficient, modification-proficient mutant of S. albus G. SalI activity was detected in cell-free extracts of the clones, though only at levels comparable with that in S. albus G. Five different recombinant plasmids were isolated, with inserts of 5.6, 5.7, 8.9, 10 and 18.9 kb that contained a common region of 4.5 kb. These plasmids could not be digested by SalI, although the vector has four recognition sites for this enzyme, indicating that the salM gene was also cloned and expressed. Subcloning experiments in S. lividans indicated the approximate location of salR and salM, and in Escherichia coli led to detectable expression of salM but not of salR. A variety of previously isolated S. albus G mutants affected in aspects of SalI-specific restriction and modification were complemented by the cloned DNA; they included a mutant temperature-sensitive for growth apparently because of a mutation in salM. Southern blotting showed that DNA homologous to the cloned sal genes was present in Xanthomonas and Rhodococcus strains, but not detectably in Herpetosiphon strains, all of which produce SalI isoschizomers.
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Rodicio, M.R., Chater, K.F. Cloning and expression of the SalI restriction-modification genes of Streptomyces albus G . Mol Gen Genet 213, 346–353 (1988). https://doi.org/10.1007/BF00339601
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DOI: https://doi.org/10.1007/BF00339601