Putative F-box protein At1g65770.

Glutathione S-transferase DHAR2; Displays a dual function. As a soluble protein, exhibits glutathione-dependent thiol transferase and dehydroascorbate (DHA) reductase activities. Exhibits glutathione-dependent thiol transferase and dehydroascorbate (DHA) reductase activities. Key component of the ascorbate recycling system. Involved in the redox homeostasis, especially in scavenging of ROS under oxidative stresses. Plays a role in ozone tolerance; Belongs to the GST superfamily. DHAR family.

Putative F-box protein At1g65770.

Gamma-glutamyl peptidase 2; Involved in glucosinolate biosynthesis. Hydrolyzes the gamma- glutamyl peptide bond of several glutathione (GSH) conjugates to produce Cys-Gly conjugates related to glucosinolates. The gamma-Glu- Cys-Gly-GSH conjugates are the sulfur-donating molecule in glucosinolate biosynthesis.

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.

Putative F-box protein At1g65770.

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.

Putative F-box protein At1g65770.

Probable L-gulonolactone oxidase 1; May be involved in the biosynthesis of ascorbic acid. Belongs to the oxygen-dependent FAD-linked oxidoreductase family.

Putative F-box protein At1g65770.

L-gulonolactone oxidase 2; Catalyzes the oxidation of L-gulono-1,4-lactone to ascorbic acid. L-gulono-1,4-lactone is oxidized to hydrogen peroxide and L-xylo-hexulonolactone which spontaneously isomerizes to L-ascorbate (By similarity).

Putative F-box protein At1g65770.

L-gulonolactone oxidase 3; Catalyzes the oxidation of L-gulono-1,4-lactone to ascorbic acid. L-gulono-1,4-lactone is oxidized to hydrogen peroxide and L-xylo-hexulonolactone which spontaneously isomerizes to L-ascorbate (By similarity).

Putative F-box protein At1g65770.

Probable L-gulonolactone oxidase 4; May be involved in the biosynthesis of ascorbic acid. Belongs to the oxygen-dependent FAD-linked oxidoreductase family.

Putative F-box protein At1g65770.

L-gulonolactone oxidase 5; Catalyzes the oxidation of L-gulono-1,4-lactone to ascorbic acid. L-gulono-1,4-lactone is oxidized to hydrogen peroxide and L-xylo-hexulonolactone which spontaneously isomerizes to L-ascorbate (By similarity); Belongs to the oxygen-dependent FAD-linked oxidoreductase family.

Putative F-box protein At1g65770.

Probable truncated L-gulonolactone oxidase 7, mitochondrial; May be involved in the biosynthesis of ascorbic acid.

Putative F-box protein At1g65770.

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.

Putative F-box protein At1g65770.

Monodehydroascorbate reductase 3; Catalyzes the conversion of monodehydroascorbate to ascorbate, oxidizing NADH in the process. Required for producing sufficient ascorbate to maintain the interaction between Piriformospora indica and Arabidopsis in a mutualistic state.

Putative F-box protein At1g65770.

Inositol oxygenase 4; Involved in the biosynthesis of UDP-glucuronic acid (UDP- GlcA), providing nucleotide sugars for cell-wall polymers. May be also involved in plant ascorbate biosynthesis.

Putative F-box protein At1g65770.

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.

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.

L-ascorbate peroxidase 1, cytosolic; Plays a key role in hydrogen peroxide removal. Constitutes a central component of the reactive oxygen gene network.

Glutathione S-transferase DHAR1, mitochondrial; Displays a dual function. As a soluble protein, exhibits glutathione-dependent thiol transferase and dehydroascorbate (DHA) reductase activities. Key component of the ascorbate recycling system. Involved in the redox homeostasis, especially in scavenging of ROS under oxidative stresses, subsequently to biotic or abiotic inducers. As a peripheral membrane protein, could also function as voltage-gated ion channel. Belongs to the GST superfamily. DHAR family.

L-ascorbate peroxidase 1, cytosolic; Plays a key role in hydrogen peroxide removal. Constitutes a central component of the reactive oxygen gene network.

Glutathione S-transferase DHAR2; Displays a dual function. As a soluble protein, exhibits glutathione-dependent thiol transferase and dehydroascorbate (DHA) reductase activities. Exhibits glutathione-dependent thiol transferase and dehydroascorbate (DHA) reductase activities. Key component of the ascorbate recycling system. Involved in the redox homeostasis, especially in scavenging of ROS under oxidative stresses. Plays a role in ozone tolerance; Belongs to the GST superfamily. DHAR family.

L-ascorbate peroxidase 1, cytosolic; Plays a key role in hydrogen peroxide removal. Constitutes a central component of the reactive oxygen gene network.

Glutathione S-transferase DHAR3, chloroplastic; Displays a dual function. As a soluble protein, exhibits glutathione-dependent thiol transferase and dehydroascorbate (DHA) reductase activities. Key component of the ascorbate recycling system. Involved in the redox homeostasis, especially in scavenging of ROS under oxidative stresses (By similarity).

L-ascorbate peroxidase 1, cytosolic; Plays a key role in hydrogen peroxide removal. Constitutes a central component of the reactive oxygen gene network.

Glutathione reductase, chloroplastic; Maintains high levels of reduced glutathione in the chloroplast.

L-ascorbate peroxidase 1, cytosolic; Plays a key role in hydrogen peroxide removal. Constitutes a central component of the reactive oxygen gene network.

Glutathione S-transferase family protein.