Research Article

Asp295 Stabilizes the Active-Site Loop Structure of Pyruvate Dehydrogenase, Facilitating Phosphorylation of Ser292 by Pyruvate Dehydrogenase-Kinase

Table 2

Kinetic parameters of WT AtPDC E1 and site-directed mutants. Activities were determined by assaying decarboxylation of [1-14C] pyruvate in the presence of 1.8 μM K3Fe(CN)6.

Enzyme pyruvate (μM) (s−1) (μM−1 s−1)

WTAtE1 3.5
D295A 0.3
D295N 0.1
G297D 1.0