Molecular cloning and characterization of the gene encoding the DNA methyltransferase, M.CviBiii, from Chlorella virus NC-1A

Kenneth E. Narva, Douglas L. Wendell, Merri P. Skrdla, James L. van Etten

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The gene encoding the DNA methyltransferase, M.CviBIII, from Chlorella virus NC-1A was cloned and expressed in E. coli plasmid pUC8.Plasmid (pNC-1A.14.8) encoded M.CviBIII methylates adenine in TCGA sequences both in vivo in E.coli and in vitro.Transposon Tn5 mutagenesis localized the M.CviBIII functional domain to a 1.5 kbp region of pNC-1A.14.8 and also indicated that a virus promoter directs transcription of the gene in E. coli. The 2.1 kbp insert containing the M.C.ViBIII gene was sequenced and a single open reading frame of 1131 bp was identified within the domain determined by Tn5 mutagenesis. When the M.CviBIII gene was fused in-frame with the 19 amino-terminal codons of lacZ a 45 kD polypeptide was identified in maxicells as predicted by the DNA sequence. The M.CviBIII gene was not essential for virus replication since a virus M.CviBIII deletion mutant also replicated in Chlorella.

Original languageEnglish (US)
Pages (from-to)9807-9823
Number of pages17
JournalNucleic acids research
Issue number23
Publication statusPublished - Dec 10 1987


ASJC Scopus subject areas

  • Genetics

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