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lüll Nicking endonucleases Zheleznaya LA; Kachalova GS; Artyukh RI; Yunusova AK; Perevyazova TA; Matvienko NIBiochemistry (Mosc) 2009[Dec]; 74 (13): 1457-66Nicking endonucleases are a new type of enzymes. Like restriction endonucleases, they recognize short specific DNA sequence and cleave DNA at a fixed position relatively to the recognition sequence. However, unlike restriction endonucleases, nicking endonucleases cleave only one predetermined DNA strand. Until recently, nicking endonucleases were suggested to be naturally mutated restriction endonucleases which had lost their ability to dimerize and as a result the ability to cleave the second strand. We have shown that nicking endonucleases are one of the subunits of heterodimeric restriction endonucleases. Mechanisms used by various restriction endonucleases for double-stranded cleavage, designing of artificial nicking endonucleases on the basis of restriction endonucleases, and application of nicking endonucleases in molecular biology are reviewed.|*DNA Breaks, Single-Stranded[MESH]|Amino Acid Sequence[MESH]|Base Sequence[MESH]|DNA Restriction Enzymes/genetics/metabolism[MESH]|Deoxyribonuclease I/chemistry/genetics/*metabolism[MESH]|Models, Molecular[MESH]|Molecular Sequence Data[MESH]|Protein Structure, Tertiary[MESH] |