    2.7.4.13 | more |
essential catalytic site residue, active site modelling, overview. The charged amino acid residues of the NMP binding domain and the presence of an OH-group at position 17 are important for the catalytic activity. Arginine residues at positions 130 and 172 are involved in the binding to the donor gamma-phosphoryl and acceptor alpha-phosphoryl groups, as well as the aspartic acid residue at position 16 of the ATP-binding site (P-loop), in the binding to some acceptors, first of all dTMP. The NMPK-P loop, or a glycine enriched loop, forms an anion hole interacting with donor phosphoryl groups. It contains a GX1X2X3X4GKX5T(S) consensus called the Walker A motif |
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