Inositol-3-phosphate synthase isozyme 2; ** Referred to as MIPS1 in Mitsuhashi et al 2008. Myo-inositol-1-phosphate synthase isoform 2. Expressed in leaf, root and silique. Immunolocalization experiments with an antibody recognizing MIPS1, MIPS2, and MIPS3 showed endosperm localization

NAD(P)-linked oxidoreductase superfamily protein; 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

Inositol-3-phosphate synthase isozyme 1; Catalyzes the majority of myo-inositol synthesis required for plant growth and development. Acts as a repressor of programmed cell death and protects plant cells against cell death under high light intensity or long days. Controls its own transcription by inhibiting ATXR6 activity. Reduces the deposition of inhibitory histone marks on its own promoter; Belongs to the myo-inositol 1-phosphate synthase family

Probable inositol 3-phosphate synthase isozyme 3; Myo-inositol-1-phosphate synthase isoform 3.Expressed in leaf, root and silique. Immunolocaliazation experiments with an antibody recognizing MIPS1, MIPS2, and MIPS3 showed endosperm localization

Histidinol-phosphate aminotransferase; HISTIDINE BIOSYNTHESIS 6B; Encodes a protein that is believed to act as a histidinol-phosphate transaminase involved in histidine biosynthesis. If the gene encoding the other protein shown to have this function, HISN6A (AT5G10330), is disrupted, a residual level of histidine biosynthesis continues, suggesting that HISN6B can somewhat compensate for the loss of HISN6A

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

Probable CDP-diacylglycerol--inositol 3-phosphatidyltransferase 2; Catalyzes the biosynthesis of phosphatidylinositol (PtdIns) as well as PtdIns:inositol exchange reaction. May thus act to reduce an excessive cellular PtdIns content. The exchange activity is due to the reverse reaction of PtdIns synthase and is dependent on CMP, which is tightly bound to the enzyme (By similarity)

CDP-diacylglycerol--inositol 3-phosphatidyltransferase 1; Catalyzes the biosynthesis of phosphatidylinositol (PtdIns) as well as PtdIns:inositol exchange reaction. May thus act to reduce an excessive cellular PtdIns content. The exchange activity is due to the reverse reaction of PtdIns synthase and is dependent on CMP, which is tightly bound to the enzyme; Belongs to the CDP-alcohol phosphatidyltransferase class-I family

3'(2'), 5'-bisphosphate nucleotidase / inositol polyphosphate 1-phosphatase; Inositol monophosphatase family protein; Converts adenosine 3'-phosphate 5'-phosphosulfate (PAPS) to adenosine 5'-phosphosulfate (APS) and 3'(2')-phosphoadenosine 5'- phosphate (PAP) to AMP. May regulate the flux of sulfur in the sulfur-activation pathway by converting PAPS to APS (By similarity). Prevents both the toxicity of PAP on RNA processing enzymes as well as the product inhibition by PAP of sulfate conjugation. Is also able to hydrolyze inositol 1,4-bisphosphate