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Recombinant plasmids harbouring the functional M.NgoPII methyltransferase (specificity 5'-GGCC-3') were isolated from amplified gene libraries of gonococcal chromosomal DNA cloned in pBR322 and in Escherichia coli RR1. The M.NgoPII gene was localized by sub-cloning and the nucleotide sequence of a cloned 1.6 kb segment of Neisseria gonorrhoeae DNA harbouring the methylase gene was determined. This data, coupled with sub-cloning experiments and in vitro transcription-translation studies, indicates a theoretical size of 38.5 kd for the methylase protein. The predicted amino acid sequence of the methylase contains significant regions of homology with the projected sequences of other cytosine-modifying methylases, upon which the activity of these enzymes is likely to depend.

nucleic acids research

Sequence analysis of the<i>Ngo</i>PII methyltransferase gene from<i>Neisseria gonorrhoeae</i>P9: homologies with other enzymes recognizing the sequence 5′-GGCC-3′

Sequence analysis of theNgoPII methyltransferase gene fromNeisseria gonorrhoeaeP9: homologies with other enzymes recognizing the sequence 5′-GGCC-3′