Abstract
Fok I restriction endonuclease recognizes the nonpalindromic pentadeoxyribonucleotide 5'-GGATG-3'.5'-CATCC-3' in duplex DNA and cleaves 9 and 13 nt away from the recognition site. Recently, we reported the presence of two distinct and separable domains within this enzyme: one for the sequence-specific recognition of DNA (the DNA-binding domain) and the other for the endonuclease activity (the cleavage domain). Here, we report the construction of a chimeric restriction endonuclease by linking the Drosophila Ultrabithorax homeodomain to the cleavage domain (FN) of Fok I restriction endonuclease. The hybrid enzyme, Ubx-FN, was purified, and its cleavage properties were characterized. The hybrid enzyme shows the same DNA sequence-binding preference as that of Ubx; as expected, it cleaves the DNA away from the recognition site. On the 5'-TTAATGGTT-3' strand the hybrid enzyme cleaves 3 nt away from the recognition site, whereas it cuts the complementary 5'-AACCATTAA-3' strand 8, 9, or 10 nt away from the binding site. Similarly engineered hybrid enzymes could be valuable tools in physical mapping and sequencing of large eukaryotic genomes.
MeSH Terms
Amino Acid Sequence
Animals
Base Sequence
Binding Sites/genetics
Cloning, Molecular
DNA, Recombinant/chemistry,genetics
Deoxyribonucleases, Type II Site-Specific/genetics
Drosophila/genetics
Escherichia coli/genetics
Flavobacterium/enzymology,genetics
Genes, Bacterial
Genes, Homeobox
Genes, Insect
Genetic Vectors
Molecular Sequence Data
Nucleic Acid Conformation
Protein Conformation
Recombinant Fusion Proteins/chemistry,genetics
Chemicals
DNA, Recombinant
Recombinant Fusion Proteins
endodeoxyribonuclease FokI
Deoxyribonucleases, Type II Site-Specific
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Kim Y G
Department of Environmental Health Sciences, School of Hygiene and Public Health, Johns Hopkins University, Baltimore, MD 21205-2179.
Chandrasegaran S
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