Complementation by detached parts of GGCC-specific DNA methyltransferases

György Pósfai, Sun C. Kim, László Szilák, Attila Kovács, Pál Venetianer

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Individually inactive N- and C-terminal fragments of the m5C-methyltransferase M.flspRI can complement each other resulting in specific, in vivo methylatlon of the DNA. This was shown by cloning the coding regions for N- and C-terminal parts of the enzyme in compatible plasmids and co-transforming them into E.coli cells. The enzyme could be detached at several different sites, producing either non-overlapping or partially overlapping fragments capable of complementation. Reconstitution of the active methyltransferase from inactive fragments was demonstrated in vitro, as well. Another GGCC-specific methyltransferase, M.BsuRI, showed a similar complementation phenomenon. Moreover, interspecles complementation was observed between appropriate fragments of the two closely related enzymes M.BspRI and M.BsuRI. Fragments of structurally and functionally more different methyltransferases were unable to complement each other.

Original languageEnglish
Pages (from-to)4843-4847
Number of pages5
JournalNucleic acids research
Issue number18
Publication statusPublished - Sep 25 1991


ASJC Scopus subject areas

  • Genetics

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