FIG. 1.

(A) Activities of RuBisCO (○), phosphoglycerate kinase (PGK; ■), and formate dehydrogenase [FDH (NAD-dependent); ▴] of X. flavus growing on 5 mM gluconate. The results following addition of 20 mM formate and automatic titration with formic acid (25% [vol/vol]) at time zero) are shown. Enzyme activities are expressed in nanomoles per minute per milligram of protein. (B) NAD(H) (▾) and NADP(H) (▿) redox balance ([NAD(P)H]/[NAD(P)] + [NAD(P)H]) of X. flavus growing on 5 mM gluconate. The results before and after the addition of 20 mM formate and automatic titration with formic acid (25% [vol/vol]) at time zero are shown.