3.1.3.103	structures of BT_1713 liganded to the cofactor Mg2+ and complexed with tungstate or VO3-/Neu5Ac, to 1.1, 1.85, and 1.63 A resolution, respectively. The active site lies at the subunit interface and Arg64, Lys67, and Glu56 are the key residues involved in sugar binding essential for catalytic function	738574