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Nucleic Acids Res. Feb 15, 1998; 26(4): 1084–1091.
PMCID: PMC147350

Cloning and analysis of the four genes coding for Bpu10I restriction-modification enzymes.

Abstract

The Bpu 10I R-M system from Bacillus pumilus 10, which recognizes the asymmetric 5'-CCTNAGC sequence, has been cloned, sequenced and expressed in Escherichia coli . The system comprises four adjacent, similarly oriented genes encoding two m5C MTases and two subunits of Bpu 10I ENase (34.5 and 34 kDa). Both bpu10IR genes either in cis or trans are needed for the manifestation of R. Bpu 10I activity. Subunits of R. Bpu 10I, purified to apparent homogeneity, are both required for cleavage activity. This heterosubunit structure distinguishes the Bpu 10I restriction endonuclease from all other type II restriction enzymes described previously. The subunits reveal 25% amino acid identity. Significant similarity was also identified between a 43 amino acid region of R. Dde I and one of the regions of higher identity shared between the Bpu 10I subunits, a region that could possibly include the catalytic/Mg2+binding center. The similarity between Bpu 10I and Dde I MTases is not limited to the conserved motifs (CM) typical for m5C MTases. It extends into the variable region that lies between CMs VIII and IX. Duplication of a progenitor gene, encoding an enzyme recognizing a symmetric nucleotide sequence, followed by concerted divergent evolution, may provide a possible scenario leading to the emergence of the Bpu 10I ENase, which recognizes an overall asymmetric sequence and cleaves within it symmetrically.

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