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Cloning and sequences of the genes encoding the CfrBI restriction-modification system from Citrobacter freundii.
The genes encoding the CfrBI restriction and modification (R-M) systems from Citrobacter freundii and recognizing the sequence 5'-CCWWGG-3' (W = A or T) were cloned in Escherichia coli McrBC- cells. The nucleotide (nt) sequences of the genes were determined. Two large open reading frames were found. Deletion analysis showed that one of them [1128 nt coding for 376 amino acids (aa)] corresponds to a methyltransferase (MTase)-encoding gene and the other (1065 nt coding for 355 aa) to a restriction endonuclease-encoding gene. The genes are oriented divergently and separated by 76 bp. A CfrBI site (5'-m4CCATGG) was found in the intergenic region of the cfrBIRM genes. Analysis of the deduced aa sequence of M.CfrBI made it possible to determine the typical features of a m4C-specific MTase. Limited homology between the M.CfrBI and R.CfrBI proteins was also found.M V Zakharova, A N Kravetz, I V Beletzkaja, A V Repyk, A S Solonin
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