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. 1976 May;126(2):990-6.
doi: 10.1128/jb.126.2.990-996.1976.

In vivo methylation by Escherichia coli K-12 mec+ deoxyribonucleic acid-cytosine methylase protects against in vitro cleavage by the RII restriction endonuclease (R. Eco RII)

S Schlagman, S Hattman, M S May, L Berger

In vivo methylation by Escherichia coli K-12 mec+ deoxyribonucleic acid-cytosine methylase protects against in vitro cleavage by the RII restriction endonuclease (R. Eco RII)

S Schlagman et al. J Bacteriol. 1976 May.

Abstract

We have analyzed the susceptibility of the deoxyribonucleic acid (DNA) of phage fd replicative form (RF) and of Escherichia coli to in vitro cleavage by purified RII restriction endonuclease (R. Eco RII). The results are summarized as follows: (i) fd, mec- RFI, isolated from infected E. coli K-12 mec- bacteria (a mutant strain lacking DNA-cytosine methylase activity), is cleaved into at least two fragments, whereas fd. mec+ RFI, isolated from the parental mec+ strain, is not cleaved. (ii) E. coli mec- DNA is extensively degraded, whereas mec+ DNA-cytosine methylase acts as an RII modification enzyme.

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References

    1. Nature. 1975 Jan 10;253(5487):132-4 - PubMed
    1. J Bacteriol. 1975 Apr;122(1):129-38 - PubMed
    1. J Bacteriol. 1975 Aug;123(2):768-70 - PubMed
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