Analogues of NADP+ as inhibitors and coenzymes for NADP+ malic enzyme from maize leaves |
| |
Authors: | Claudia P. Spampinato Piotr Paneth Marion H. O'Leary Carlos S. Andreo |
| |
Affiliation: | (1) Centro de Estudios Fotosintéticos y Bioquímicos, UNR-CONICET, Suipacha 531, 2000 Rosario, Argentina;(2) Department of Biochemistry, University of Nebraska-Lincoln, East Campus, 68583-0718 Lincoln, Nebraska, USA;(3) Institute of Applied Radiation Chemistry, Tecynical University of Lodz, Poland;(4) the John Simon Guggenheim Memorial Foundation, USA |
| |
Abstract: | Structural analogues of the NADP+ were studied as potential coenzymes and inhibitors for NADP+ dependent malic enzyme from Zea mays L. leaves. Results showed that 1, N6-etheno-nicotinamide adenine dinucleotide phosphate ( NADP+), 3-acetylpyridine-adenine dinucleotide phosphate (APADP+), nicotinamide-hypoxanthine dinucleotide phosphate (NHDP+) and -nicotinamide adenine dinucleotide 2: 3-cyclic monophosphate (23NADPc+) act as alternate coenzymes for the enzyme and that there is little variation in the values of the Michaelis constants and only a threefold variation in Vmax for the five nucleotides. On the other hand, thionicotinamide-adenine dinucleotide phosphate (SNADP+), 3-aminopyridine-adenine dinucleotide phosphate (AADP+), adenosine 2-monophosphate (2AMP) and adenosine 2: 3-cyclic monophosphate (23AMPc) were competitive inhibitors with respect to NADP+, while -nicotinamide adenine dinucleotide 3-phosphate (3NADP+), NAD+, adenosine 3-monophosphate (3AMP), adenosine 2: 5-cyclic monophosphate (25AMPc), 5AMP, 5ADP, 5ATP and adenosine act as non-competitive inhibitors. These results, together with results of semiempirical self-consistent field-molecular orbitals calculations, suggest that the 2-phosphate group is crucial for the nucleotide binding to the enzyme, whereas the charge density on the C4 atom of the pyridine ring is the major factor that governs the coenzyme activity.Abbreviations NADP+ 1, N6-etheno-nicotinamide adenine dinucleotide phosphate - NHDP+ nicotinamide-hypoxanthine dinucleotide phosphate - APADP+ 3-acetylpyridine-adenine dinucleotide phosphate - SNADP+ thionicotinamide-adenine dinucleotide phosphate - AADP+ 3-aminopyridine-adenine dinucleotide phosphate - 23NADPc+ -nicotinamide adenine dinucleotide 2: 3-cyclic monophosphate - 3NADP+ -nicotinamide adenine dinucleotide 3-phosphate - 2AMP adenosine 2-monophosphate - 3AMP adenosine 3-monophosphate - 23AMPc adenosine 2: 3 monophosphate cyclic - A adenosine - RuBP ribulose 1,5-bisphosphate - SCF-MO Self-Consistent Field-Molecular Orbitals (method) |
| |
Keywords: | C4-photosynthesis decarboxylation NADP+-ME type |
本文献已被 SpringerLink 等数据库收录! |
|