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J. Biol. Chem., Vol. 275, Issue 40, 30878-30885, October 6, 2000
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,
,
From the Institute of Biotechnology, Graiciuno 8, Vilnius 2028, Lithuania
The type IIs restriction enzyme BfiI
recognizes the non-palindromic nucleotide sequence 5'-ACTGGG-3' and
cleaves complementary DNA strands 5/4 nucleotides downstream of the
recognition sequence. The genes coding for the BfiI
restriction-modification (R-M) system were cloned/sequenced and
biochemical characterization of BfiI restriction enzyme was
performed. The BfiI R-M system contained three proteins:
two N4-methylcytosine methyltransferases and a restriction enzyme.
Sequencing of bisulfite-treated methylated DNA indicated that each
methyltransferase modifies cytosines on opposite strands of the
recognition sequence. The N-terminal part of the BfiI
restriction enzyme amino acid sequence revealed intriguing similarities
to an EDTA-resistant nuclease of Salmonella typhimurium. Biochemical analyses demonstrated that BfiI, like the
nuclease of S. typhimurium, cleaves DNA in the absence of
Mg2+ ions and hydrolyzes an artificial substrate
bis(p-nitrophenyl) phosphate. However, unlike the
nonspecific S. typhimurium nuclease, BfiI
restriction enzyme cleaves DNA specifically. We propose that the
DNA-binding specificity of BfiI stems from the C-terminal part of the protein. The catalytic N-terminal subdomain of
BfiI radically differs from that of type II restriction
enzymes and is presumably similar to the EDTA-resistant nonspecific
nuclease of S. typhimurium; therefore, BfiI did
not require metal ions for catalysis. We suggest that BfiI
represents a novel subclass of type IIs restriction enzymes that
differs from the archetypal FokI endonuclease by the fold
of its cleavage domain, the domain location, and reaction mechanism.
The nucleotide sequence(s) reported in this paper has been submitted to the GenBankTM/EMBL Data Bank with accession number(s) AJ290970.
Both authors contributed equally to this work and should be
treated as joint first authors.
§
To whom correspondence should be addressed. Tel.: 370-2-602108, Fax: 370-2-602116; E-mail: siksnys@ibt.lt.
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