The presence of Asn, Asp, and Val alters the binding of PKM2 for substrate PEP, but not ADP.
A, binding of ADP in the absence (black) and presence of 1 mm Asn (magenta), Asp (salmon), and Val (green), showing that the AAs do not influence the ADP-binding affinity of PKM2. B, PEP-binding affinity of PKM2 in the absence (black) and presence of 1 mm Asn (magenta), Asp (salmon), or Val (green). Kd values were as follows: 10 ± 2 μm (no AA ligand), 0.27 ± 0.0 μm (Asn), 0.29 ± 0.01 μm (Asp), and 81 ± 21 μm (Val). Error bars, S.E.