5' G-A-A-T-T-C 3' DNA Binding Site | Vibepedia

The 5' G-A-A-T-T-C 3' DNA binding site, commonly known as the EcoRI restriction site, is a specific six-nucleotide sequence recognized and cleaved by the EcoRI restriction enzyme. This sequence is a palindrome, meaning it reads the same forwards and backward on opposite DNA strands (5'-GAATTC-3' and 3'-CTTAAG-5'). Discovered in 1970 in *Escherichia coli* strain RY13, EcoRI's ability to precisely cut DNA at this site revolutionized genetic engineering by enabling the isolation and manipulation of specific DNA fragments. This precise cutting mechanism, producing 'sticky ends' that can be ligated to other compatible fragments, underpins techniques like gene cloning, DNA sequencing, and the construction of recombinant DNA molecules, making it an indispensable tool in laboratories worldwide. The prevalence and specificity of this site have also made it a subject of study in understanding DNA-protein interactions and genome organization.