1.1.1.288: xanthoxin dehydrogenase
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For detailed information about xanthoxin dehydrogenase, go to the full flat file.
Word Map on EC 1.1.1.288
Reaction
Synonyms
ABA deficient 2, ABA2, glucose insensitive 1, Os03g0810800, SDR1, short-chain dehydrogenase/reductase1, wilty, xanthoxin oxidase, XDR
ECTree
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General Information on EC 1.1.1.288 - xanthoxin dehydrogenase
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GENERAL INFORMATION 
ORGANISM
UNIPROT
COMMENTARY 
LITERATURE
evolution
the enzyme belongs to the short-chain dehydrogenase/reductase superfamily of enzymes
malfunction
the aba2 mutant displays less seed dormancy, glucose insensitivity, small plat size, early flowering, and wiltness, no complementation by expression of AtSDR3, enotype, overview
metabolism
the enzyme is involved in the carotenoid synthesis and metabolism. Transcriptional response of different light qualities in leaf coloration of cv. Huangjinya, RNA-seq analysis with three biological replicates identifies differentially expressed genes involved in pigment metabolism pathways. With regard to porphyrin and chlorophyll metabolism, the protochlorophyllide oxidoreductase (POR) is upregulated and chlorophyllase (Chlase) is downregulated under red light (RL) compared with white light (WL), which contributes to high chlorophyll content in cv. Huangjinya. The upregulated POR and magnesium chelatase H subunit (CHLH) are identified under red + blue light (RB). Blue light (BL) significantly promotes carotenoid biosynthesis, accompanied by the related upregulated genes. But upregulated xanthoxin dehydrogenase (ABA2) reduces carotenoid content under BL. Zeaxanthin epoxidase (ZEP) is upregulated and ABA2 is downregulated under RB, resulting in high accumulation of carotenoid content. BL and RL upregulated expressions of genes involved in flavonoid biosynthesis in cv. Huangjinya. Differential expressions of genes involved in flavonoid biosynthesis is considered as the results of leaf color change. In addition, the genes related to photosynthesis are downregulated under RL, whereas these are upregulated under BL when compared with WL. In conclusion, the effect of light quality on the leaf coloration of cv. Huangjinya is mainly dependent on chlorophyll content by altering corresponding genes expressions. RL may promote the accumulation of chlorophyll in cv. Huangjinya leaves by upregulating the expression of genes related to chlorophyll synthesis (e.g. POR) and downregulating expression of genes related to chlorophyll degradation (e.g. Chlase). BL can upregulate the expression of genes related to both biosynthesis (e.g. POR, hemA) and degradation (e.g. Chlase) of chlorophyll, resulting in little change in leaf color of cv. Huangjinya under BL when compared with WL. Upregulated genes involved in chlorophyll biosynthesis (e.g. POR, CHLH) induce greener color of cv. Huangjinya treated with RB
physiological function
additional information
physiological function
expression of Oryza sativa ABA2 in an Arabidopsis Aba2 mutant rescues the Aba2 mutant phenotypes, characterized by reduced growth, increased water loss, and germination in the presence of paclobutrazol
physiological function
the so-called wilty mutation affects the xanthoxin dehydrogenase step in abscisic acid biosynthesis. Functional abscisic acid biosynthesis is critical for normal stomatal responses to changes in humidity in angiosperms,with wilty mutant plants having no increase in foliar abscisic acid levels in response to a doubling in vapour pressure deficit, and no closure of stomata
additional information
comparative expression analysis of three AtSDR genes and their amino acid sequence alignment, overview
additional information
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comparative expression analysis of three AtSDR genes and their amino acid sequence alignment, overview
