Abstract
Spinach (Spinacia oleracea L.) chloroplast NAD(P)-dependent glyceraldehyde 3-phosphate dehydrogenase (NAD(P)-GAPDH; EC 1.2.1.13) was purified. The association state of the protein was monitored by fast protein liquid chromatography-Superose 12 gel filtration. Protein chromatographed in the presence of NADP+ and dithiothreitol consisted of highly NADPH-active protomers of 160 kDa; otherwise, it always consisted of a 600-kDa oligomer (regulatory form) favoured by the addition of NAD+ in buffers and with low NADPH-dependent activity (ratio of activities with NADPH versus NADH of 0.2–0.4). Glycerate 1,3-bisphosphate (BPGA) was prepared enzymatically using rabbit-muscle NAD-GAPDH, and purified. Among known modulators of spinach NAD(P)-GAPDH, BPGA is the most effective on a molar basis in stimulating NADPH-activity of “dark” chloroplast extracts and purified NAD(P)-GAPDH (activation constant, K a= 12 μM). It also causes the enzyme to dissociate into 160-kDa protomers. The K m of BPGA both with NADPH or NADH as coenzyme is 4–7 μM. NAD+ and NADH are inhibitory to the activation process induced by BPGA. This compound, together with NADP(H) and ATP belongs to a group of substrate-modifiers of the NADPH-activity and conformational state of spinach NAD(P)-GAPDH, all characterized by K a values three- to tenfold higher than the K m. Since NADP(H) is largely converted to NAD(H) in darkened chloroplasts Heineke et al. 1991, Plant Physiol. 95, 1131–1137, it is proposed that NAD+ promotes NAD(P)-GAPDH association into a regulatory conformer with low NADPH-activity during dark deactivation. The process is reversed in the light by BPGA and other substrate-modifiers whose concentration increases during photosynthesis, in addition to reduced thioredoxin.
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Abbreviations
- BPGA:
-
glycerate 1,3-bisphosphate
- Chl:
-
chlorophyll
- DTT:
-
dithiothreitol
- FPLC:
-
fast protein liquid chromatography
- NAD(P)-GAPDH:
-
glyceraldehyde 3-phosphate dehydrogenase, NAD(P)-dependent
- 3-PGA:
-
glyerate 3-phosphate
- PGK:
-
phosphoglycerate kinase
- Prt:
-
protein
- Tricine:
-
N-tris (hydroxymethyl) methyl-glycine
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This work was supported by grants from the Ministero dell'Università e della Ricerca Scientifica e Technologica in years 1990–1991. We are grateful to Dr. G. Branlant (Laboratoire d'Enzymologie et de Génie Génétique, Vandoeuvre les Nancy, France) for introducing us to the BPGA purification procedure.
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Trost, P., Scagliarini, S., Valenti, V. et al. Activation of spinach chloroplast glyceraldehyde 3-phosphate dehydrogenase: effect of glycerate 1,3-bisphosphate. Planta 190, 320–326 (1993). https://doi.org/10.1007/BF00196960
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DOI: https://doi.org/10.1007/BF00196960