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We have determined the crystal structure of the PvuII endonuclease in the presence of Mg 2+ . According to the structural data, divalent metal ion binding in the PvuII subunits is highly asymmetric. The PvuII-Mg 2+ complex has two distinct metal ion binding sites, one in each monomer. One site is formed by the catalytic residues Asp58 and Glu68, and has extensive similarities...
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