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Restriction endonucleases, often referred to as restriction enzymes, are specialized proteins that act as molecular scissors capable of cutting DNA at specific sequences. These enzymes are naturally found in bacteria and archaea, where they serve as a defense mechanism against invading viral DNA, particularly bacteriophages. They recognize particular short DNA sequences, usually 4 to 8 base pairs long, known as recognition sites, and cleave the DNA at or near these sites. The specificity of this cleavage allows researchers to manipulate DNA precisely in the laboratory, making restriction endonucleases a cornerstone of recombinant DNA technology. Restriction enzymes are classified into several ________ ____ ________ _________ ______.
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