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- W1992808101 abstract "Structural analogues of d-glyceraldehyde-3-phosphate (D-Ga3P) and NADP+ were studied as potential substrates and inhibitors of the non-phosphorylating glyceraldehyde-3-phosphate dehydrogenase (EC 1.2.1.9; GAPN) from Apium graveolens leaves. Four analogues of NADP+: nicotinamide-hypoxanthine dinucleotide phosphate (NHDP+); 3-acetylpyridine-adenine dinucleotide phosphate (APADP+); 1,N6-etheno-nicotinamide dinucleotide phosphate (εNADP+); and β-nicotinamide adenine dinucleotide 2′:3′-cyclic monophosphate (2′3′NADP+c) were alternative enzyme substrates, with a 2-fold variation in Vmax and 2–11-fold differences in Km compared to NADP+. These compounds were also able to affect the hysteretic behavior of celery GAPN, in a similar way as the substrate NADP+. The analogues to the nicotinamide moiety: thionicotinamide and 3-aminopyridine, behaved as competitive inhibitors, exhibiting a high-affinity binding to the enzyme. All the analogues of D-Ga3P that were analyzed behaved as competitive inhibitors, except for the l-isomer of the substrate which at relatively high concentrations exhibited a non-competitive effect. Results showed the importance of: (i) the chemical group at carbon-1 of Ga3P; (ii) the presence of a phosphate ester at carbon-3, and (iii) the stereochemical configuration at carbon-2. The particular behavior of L-Ga3P is analyzed by differences in tridimensional structure between bacteria and plant GAPNs." @default.
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- W1992808101 date "2002-05-01" @default.
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- W1992808101 title "On the interaction of substrate analogues with non-phosphorylating glyceraldehyde-3-phosphate dehydrogenase from celery leaves" @default.
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- W1992808101 doi "https://doi.org/10.1016/s0168-9452(02)00015-8" @default.
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