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Differential coordination of Mg-ATP in the active site of a K+-dependent PK (WT-RMPK) (A) and in a K+-independent PK (MtbPK) (B). Panel A and Panel B show the coordination of oxalate, Mg2+, Mg-ATP, and K+ in the active sites of RMPK (PDB 1A49 subunit A; green) and of MtbPK (PDB 5WS9 subunit A; cyan), respectively. No residues of the enzymes are shown.
