Phosphotransferase.

Cytosolic isocitrate dehydrogenase [NADP]; May supply 2-oxoglutarate for amino acid biosynthesis and ammonia assimilation via the glutamine synthetase/glutamate synthase (GS/GOGAT) pathway. May be involved in the production of NADPH to promote redox signaling or homeostasis in response to oxidative stress. Belongs to the isocitrate and isopropylmalate dehydrogenases family.

Phosphotransferase.

Mannose-1-phosphate guanylyltransferase 1; Catalyzes a reaction of the Smirnoff-Wheeler pathway, the major route to ascorbate biosynthesis in plants. Plays an essential role in plant growth and development and cell-wall architecture. Provides GDP-mannose, used for cell wall carbohydrate biosynthesis, protein N-glycosylation, as well as for the biosynthesis of the antioxidant ascorbate.

Phosphotransferase.

L-galactono-1,4-lactone dehydrogenase, mitochondrial; Involved in the biosynthesis of ascorbic acid. Required for the accumulation of respiratory complex I. Uses L-galactono-1,4-lactone and L-gulono-1,4-lactone as substrates, but not D-galactono-1,4- lactone, D-gulono-1,4-lactone, L-mannono-1,4-lactone or D-galactonic acid. Also active with phenazine methosulfate and 1,4-benzoquinone as electron acceptors.

Phosphotransferase.

GDP-mannose 3,5-epimerase; Catalyzes a reversible epimerization of GDP-D-mannose that precedes the committed step in the biosynthesis of vitamin C (L- ascorbate), resulting in the hydrolysis of the highly energetic glycosyl-pyrophosphoryl linkage. Able to catalyze 2 distinct epimerization reactions and can release both GDP-L-galactose and GDP-L- gulose from GDP-mannose.

Phosphotransferase.

Peroxisomal isocitrate dehydrogenase [NADP]; May be involved in response to oxidative stresses. Belongs to the isocitrate and isopropylmalate dehydrogenases family.

Phosphotransferase.

L-galactose dehydrogenase; Catalyzes the oxidation of L-galactose to L-galactono-1,4- lactone in the presence of NAD(+). Uses NAD(+) as a hydrogen acceptor much more efficiently than NADP(+); Belongs to the aldo/keto reductase family.

Phosphotransferase.

Glucose-6-phosphate isomerase 1, chloroplastic; Promotes the synthesis of starch in leaves.

Phosphotransferase.

Glucose-6-phosphate isomerase, cytosolic; Belongs to the GPI family.

Phosphotransferase.

Mannose-6-phosphate isomerase 1; Involved in the synthesis of the GDP-mannose and dolichol- phosphate-mannose required for a number of critical mannosyl transfer reactions. Involved in the ascorbic acid (AsA) biosynthesis. Required during the endosperm development.

Phosphotransferase.

Mannose-6-phosphate isomerase 2; Involved in the synthesis of the GDP-mannose and dolichol- phosphate-mannose required for a number of critical mannosyl transfer reactions.

Phosphotransferase.

Isocitrate dehydrogenase [NADP], chloroplastic/mitochondrial; May be involved in response to oxidative stresses. Belongs to the isocitrate and isopropylmalate dehydrogenases family.

Phosphotransferase.

Inositol-phosphate phosphatase; Phosphatase acting on L-galactose 1-phosphate (L-Gal 1-P), D- myoinositol 3-phosphate (D-Ins 3-P) and D-myoinositol 1-phosphate (D- Ins 1-P). Can also use beta-glycerophosphate (glycerol 2-P) and, to a lesser extent, D-galactose 1-phosphate (D-Gal 1-P), alpha-D-glucose 1- phosphate (a-D-Glc 1-P), D-manitol 1-phosphate and adenosine 2'- monophosphate as substrates. No activity with D-fructose 1-phosphate (D-Fru 1-P), fructose 1,6-bisphosphate (Fru 1,6-bisP), D-glucose 6- phosphate (D-Glc 6-P), D-alpha-glycerophosphate (glycerol 3-P), D- sorbitol 6-phospha [...]

Phosphotransferase.

GDP-L-galactose phosphorylase 2; Catalyzes a reaction of the Smirnoff-Wheeler pathway, the major route to ascorbate biosynthesis in plants. Acts as a phosphorylase rather than as a transferase. Uses preferentially GDP-L- galactose and GDP-D-glucose as substrates. Lower activity with GDP-L- fucose, very low activity with GDP-D-mannose, and no activity with UDP- D-glucose, UDP-D-galactose or ADP-D-glucose. Highly specific for inorganic phosphate as the guanylyl acceptor.

Ethylene-responsive transcription factor ABI4; Transcription regulator that probably binds to the GCC-box pathogenesis-related promoter element. Binds also to the S-box (5'- CACTTCCA-3') photosynthesis-associated nuclear genes-related (PhANGs- related) promoter element, and thus acts as a transcription inhibitor. Involved in the regulation of gene expression by stress factors and by components of stress signal transduction pathways. May have a function in the deetiolation process. Confers sensitivity to abscisic acid (ABA), and regulates the ABA signaling pathway during seed germinatio [...]

Hexokinase-1; Fructose and glucose phosphorylating enzyme. May be involved in the phosphorylation of glucose during the export from mitochondrion to cytosol. Acts as sugar sensor which may regulate sugar-dependent gene repression or activation. Mediates the effects of sugar on plant growth and development independently of its catalytic activity or the sugar metabolism. May regulate the execution of program cell death in plant cells. Promotes roots and leaves growth. Belongs to the hexokinase family.

Ethylene-responsive transcription factor ABI4; Transcription regulator that probably binds to the GCC-box pathogenesis-related promoter element. Binds also to the S-box (5'- CACTTCCA-3') photosynthesis-associated nuclear genes-related (PhANGs- related) promoter element, and thus acts as a transcription inhibitor. Involved in the regulation of gene expression by stress factors and by components of stress signal transduction pathways. May have a function in the deetiolation process. Confers sensitivity to abscisic acid (ABA), and regulates the ABA signaling pathway during seed germinatio [...]

Putative pentatricopeptide repeat-containing protein At3g16890, mitochondrial; Required for the ubiquinol-cytochrome c oxidoreductase activity of mitochondrial complex III; Belongs to the PPR family. P subfamily.

Ethylene-responsive transcription factor ABI4; Transcription regulator that probably binds to the GCC-box pathogenesis-related promoter element. Binds also to the S-box (5'- CACTTCCA-3') photosynthesis-associated nuclear genes-related (PhANGs- related) promoter element, and thus acts as a transcription inhibitor. Involved in the regulation of gene expression by stress factors and by components of stress signal transduction pathways. May have a function in the deetiolation process. Confers sensitivity to abscisic acid (ABA), and regulates the ABA signaling pathway during seed germinatio [...]

GDP-L-galactose phosphorylase 1; Catalyzes a reaction of the Smirnoff-Wheeler pathway, the major route to ascorbate biosynthesis in plants. Acts as a phosphorylase rather than as a transferase. Uses preferentially GDP-L- galactose and GDP-D-glucose as substrates. Lower activity with GDP-L- fucose, very low activity with GDP-D-mannose, and no activity with UDP- D-glucose, UDP-D-galactose or ADP-D-glucose. Highly specific for inorganic phosphate as the guanylyl acceptor.

Putative F-box protein At1g65770.

COP9 signalosome complex subunit 5a; Probable protease subunit of the COP9 signalosome complex (CSN), a complex involved in various cellular and developmental processes such as photomorphogenesis and auxin and jasmonate responses. The CSN complex is an essential regulator of the ubiquitin (Ubl) conjugation pathway by mediating the deneddylation of the cullin subunits of the SCF-type E3 ligase complexes, leading to decrease the Ubl ligase activity of SCF. In the complex, it probably acts as the catalytic center that mediates the cleavage of Nedd8 from cullins. It however has no metallop [...]

Putative F-box protein At1g65770.

COP9 signalosome complex subunit 5b; Probable protease subunit of the COP9 signalosome complex (CSN), a complex involved in various cellular and developmental processes such as photomorphogenesis and auxin and jasmonate responses. The CSN complex is an essential regulator of the ubiquitin (Ubl) conjugation pathway by mediating the deneddylation of the cullin subunits of the SCF-type E3 ligase complexes, leading to decrease the Ubl ligase activity of SCF. In the complex, it probably acts as the catalytic center that mediates the cleavage of Nedd8 from cullins. It however has no metallop [...]

Putative F-box protein At1g65770.

Mannose-1-phosphate guanylyltransferase 1; Catalyzes a reaction of the Smirnoff-Wheeler pathway, the major route to ascorbate biosynthesis in plants. Plays an essential role in plant growth and development and cell-wall architecture. Provides GDP-mannose, used for cell wall carbohydrate biosynthesis, protein N-glycosylation, as well as for the biosynthesis of the antioxidant ascorbate.

Putative F-box protein At1g65770.

L-galactono-1,4-lactone dehydrogenase, mitochondrial; Involved in the biosynthesis of ascorbic acid. Required for the accumulation of respiratory complex I. Uses L-galactono-1,4-lactone and L-gulono-1,4-lactone as substrates, but not D-galactono-1,4- lactone, D-gulono-1,4-lactone, L-mannono-1,4-lactone or D-galactonic acid. Also active with phenazine methosulfate and 1,4-benzoquinone as electron acceptors.