EcoRV restriction enzyme. Molecular model of the type II restriction enzyme EcoRV (purple and blue) bound to a DNA molecule (deoxyribonucleic acid, pink and white). Restriction enzymes, also known as restriction endonucleases, recognise specific nucleotide sequences and cut the DNA at these sites. They are found in bacteria and archaea and are though to have evolved as a defence against viral infection. Type II restriction enzymes cut double stranded DNA. EcoRV is found in some strains of Escherichia coli bacteria. This structure is based on X-ray crystallography data.
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