DNA recognition and cleavage by the LAGLIDADG homing endonuclease I-Crel

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Abstract

The structure of the LAGLIDADG intron-encoded homing endonuclease I-Crel bound to homing site DNA has been determined. The interface is formed by an extended, concave β sheet from each enzyme monomer that contacts each DNA half-site, resulting in direct side-chain contacts to 18 of the 24 base pairs across the full-length homing site. The structure indicates that I-Crel is optimized to its role in genetic transposition by exhibiting long site-recognition while being able to cleave many closely related target sequences. DNA cleavage is mediated by a compact pair of active sites in the I-Crel homodimer, each of which contains a separate bound divalent cation.

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Jurica, M. S., Monnat, R. J., & Stoddard, B. L. (1998). DNA recognition and cleavage by the LAGLIDADG homing endonuclease I-Crel. Molecular Cell, 2(4), 469–476. https://doi.org/10.1016/S1097-2765(00)80146-X

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