An enzyme that cuts DNA at specific recognition sequences, typically 4-8 base pairs long. These molecular scissors are essential tools in molecular biology for cloning, mapping, and analyzing DNA.
Named for their role in bacterial 'restriction-modification' systems that restrict foreign DNA invasion. 'Restriction' comes from Latin 'restrictus' meaning 'limited' or 'confined,' reflecting how these enzymes limit viral infection by cutting foreign DNA at specific sites.
Restriction enzymes are bacteria's ancient immune system - they evolved to slice up invading viral DNA like molecular bouncers! Scientists borrowed these bacterial tools to become the foundation of genetic engineering, showing how nature's solutions often become our technologies.
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