Summary
The McrB restriction system in Escherichia coli K12 causes sequence-specific recognition and inactivation of DNA containing 5-methylcytosine residues. We have previously located the mcrB gene near hsdS at 99 min on the E. coli chromosome and demonstrated that is encodes a 51 kDa polypeptide required for restriction of M.AluI methylated (A-G-5mC-T) DNA. We show here, by analysis of maxicell protein synthesis of various cloned fragments from the mcrB region, that a second protein of approximately 39 kDa is also required for McrB-directed restriction. The new gene, designated mcrC, is adjacent to mcrB and located distally to hsdS. The McrB phenotype has been correlated previously with restriction of 5-hydroxy-methylcytosine (HMC)-containing T-even phage DNA that lacks the normal glucose modification of HMC, formally designated RglB (for restriction of glucoseless phage). This report reveals a difference between the previously correlated McrB and RglB restriction systems: while both require the mcrB gene product only the McrB system requires the newly identified mcrC-encoded 39-kDa polypeptide.
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References
Adams RLP, Burdon RH (1985) The function of DNA methylation of bacteria and phage. In: Rich A (ed) Molecular biology of DNA methylation. Springer, New York Heidelberg Berlin, pp 73–87
Bachmann BJ (1983) Linkage map of Escherichia coli K-12, edn 7. Microbiol Rev 47:180–230
Bickle TA (1982) The ATP-dependent restriction endonucleases. In: Linn S, Roberts RJ (eds) Nucleases. Cold Spring Harbor Laboratory Press, Cold Spring Harbor, New York, pp 85–108
Blumenthal RM, Gregory SA, Cooperider JS (1985) Cloning of a restriction-modification system from Proteus vulgaris and its use in analyzing a methylase-sensitive phenotype in Escherichia coli. J Bacteriol 164:501–509
Chang ACY, Cohen SN (1978) Construction and Characterization of amplifiable multicopy DNA cloning vehicles derived from the P15A cryptic miniplasmid. J Bacteriol 134:1141–1156
Clewell DB (1972) Nature of ColEl plasmid replication in Escherichia coli in the presence of chloramphenicol. J Bacteriol 110:667–676
Guerry P, LeBlanc DJ, Falkow S (1973) General method for the isolation of plasmid deoxyribonucleic acid. J Bacteriol 116:1064–1066
Heitman J, Model P (1987) Site-specific methylases induced the SOS DNA repair response in Escherichia coli. J Bacteriol 169:3243–3250
Holmes DS, Quigley M (1981) A rapid boiling method for the preparation of bacterial plasmids. Anal Biochem 114:193–197
Kaiser K, Murray NE (1985) The use of phage lambda replacement vectors in the construction on representative genomic DNA libraries. In: Glover DM (ed) DNA cloning: A practical approach, vol 1. IRL Press, Oxford Washington, DC p 36
Laemmli UK (1970) Cleavage of structural proteins during the assembly of the head of bacteriophage T4. Nature 227:680–685
Maniatis T, Fritsch DF, Sambrook J (1982) Molecular cloning. A laboratory manual. Cold Spring Harbor Laboratory Press, Cold Spring Harbor, New York
Marinus MG (1987) DNA methylation in Escherichia coli. Annu Rev Genet 21:113–131
Miller JH (1972) Experiments in molecular genetics. Cold Spring Harbor Laboratory Press, Cold Spring Harbor, New York
Noyer-Weidner M, Diaz R, Reiners L (1986) Cytosine-specific DNA modification interferes with plasmid establishment in Escherichia coli K-12: Involvement of rglB. Mol Gen Genet 205:469–475
Raleigh EA, Wilson G (1986) Escherichia coli K-12 restricts DNA containing 5-methylcytosine. Proc Natl Acad Sci USA 83:9070–9074
Revel HR (1967) Restriction of non-glucosylated T-even bacteriophages: properties of permissive mutants of Escherichia coli B and K-12. Virology 31:688–701
Revel HR (1983) DNA modification: glycosylation. In: Mathews CK, Kutter EM, Mosig, G, Gerget, PB (eds) Bacteriophage T4. American Society for Microbiology, Washington, DC, pp 156–165
Ross TK, Braymer HD (1987) Localization of a genetic region involved in McrB restriction by Escherichia coli K-12. J Bacteriol 169:1757–1759
Ross TK, Achberger EC, Braymer HD (1987) Characterization of the Escherichia coli modified cytosine restriction (mcrB) gene. Gene 61:277–289
Sain B, Murray NE (1980) The hsd (host specificity) genes of E. coli K-12. Mol Gen Genet 180:35–46
Sancar A, Hack AM, Rupp WD (1979) Simple method for identification of plasmid-coded proteins. J Bacteriol 137:692–693
Sancar A, Wharton RP, Seltzer S, Kacinski BM, Clark ND, Rupp WD (1981) Identification of the uvrA gene product. J Mol Biol 148:45–62
Selker E, Brown K, Yanofsky C (1977) Mitomycin C-induced expression of trpA of Salmonella typhimurium in the plasmid CoeEl. J Bacteriol 129:388–394
Vieira J, Messing J (1982) The pUC plasmids, and M13mp7-derived system for insertion mutagenesis and sequencing with synthetic universal primers. Gene 19:259–268
Wood WB (1966) Host specificity of DNA produced by Escherichia coli: bacterial mutations affected the restriction and modification of DNA. J Mol Biol 16:118–133
Yanisch-Perron C, Vieira J, Messing J (1985) Improved M13 phage cloning vectors and host strains: nucleotide sequences of the M13mp18 and pUC19 vectors. Gene 33:103–119
Yuan R (1981) Structure and mechanism of multifunctional restriction endonucleases. Annu Rev Biochem 50:285–315
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Communicated by D.J. Finnegan
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Ross, T.K., Achberger, E.C. & Braymer, H.D. Identification of a second polypeptide required for McrB restriction of 5-methylcytosine-containing DNA in Escherichia coli K12. Mol Gen Genet 216, 402–407 (1989). https://doi.org/10.1007/BF00334382
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DOI: https://doi.org/10.1007/BF00334382