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. 1985 Sep 25;13(18):6403–6421. doi: 10.1093/nar/13.18.6403

Nucleotide sequence of the BsuRI restriction-modification system.

A Kiss, G Posfai, C C Keller, P Venetianer, R J Roberts
PMCID: PMC321967  PMID: 2997708

Abstract

The genes of the 5'-GGCC specific BsuRI restriction-modification system of Bacillus subtilis have been cloned and expressed in E. coli and their nucleotide sequence has been determined. The restriction and modification genes code for polypeptides with calculated molecular weights of 66,314 and 49,642, respectively. Both enzymes are coded by the same DNA strand. The restriction gene is upstream of the methylase gene and the coding regions are separated by 780 bp. Analysis of the RNA transcripts by S1-nuclease mapping indicates that the restriction and modification genes are transcribed from different promoters. Comparison of the amino acid sequences revealed no homology between the BsuRI restriction and modification enzymes. There are, however, regions of homology between the BsuRI methylase and two other GGCC specific modification enzymes, the BspRI and SPR methylases.

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Selected References

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