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Naringenin 7-O-methyltransferase involved in the biosynthesis of the flavanone phytoalexin sakuranetin from rice (Oryza sativa L.).

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An inducible S-adenosyl-L-methionine:naringenin 7-O-methyltransferase (NOMT) catalyzing the methylation of naringenin to sakuranetin, a major rice phytoalexin was purified approximately 985-fold from ultraviolet (UV)-irradiated rice leaves. The enzyme is not found in healthy tissues and was purified

Microbial production of O-methylated flavanones from methylated phenylpropanoic acids in engineered Escherichia coli.

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Methylated flavonoids possess improved bioactivities compared to their unmethylated counterparts. In this study, for the efficient production of O-methylated flavonoids from simple methylated phenylpropanoic acids, a recombinant Escherichia coli strain expressing 4-coumarate:coenzyme A ligase (4CL)

CYP93G2 is a flavanone 2-hydroxylase required for C-glycosylflavone biosynthesis in rice.

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C-Glycosylflavones are ubiquitous in the plant kingdom, and many of them have beneficial effects on human health. They are a special group of flavonoid glycosides in which the sugars are C-linked to the flavone skeleton. It has been long presumed that C-glycosylflavones have a different biosynthetic

Molecular and Functional Characterization of Oryza sativa Flavonol Synthase (OsFLS), a Bifunctional Dioxygenase.

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Flavonol synthase (FLS) belongs to the 2-oxoglutarate-dependent dioxygenase (2-ODD) superfamily. We isolated OsFLS from the rice ( Oryza sativa) cultivar "Ilmi" OsFLS includes highly conserved 2-ODD-specific motifs and FLS-specific regions. Recombinant OsFLS exhibited both FLS and

Characterization of uridine-diphosphate dependent flavonoid glucosyltransferase from Oryza sativa.

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We cloned a uridine-diphosphate dependent glycosyltransferase RUGT-10 from Oryza sativa. The recombinant enzyme was expressed by glutathione-S transferase gene fusion system in Escherichia coli. RUGT10 showed different regioselectivity depending on the structures of substrates (e.g. flavanone,

A methyltransferase for synthesis of the flavanone phytoalexin sakuranetin in rice leaves.

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Rice (Oryza sativa L.) leaves irradiated with short wave UV light accumulated the major rice phytoalexin, flavanone sakuranetin. The extracts from these leaves catalyzed the methylation of the hydroxyl group at position 7 of naringenin to yield sakuranetin, with S-adenosyl-L-methionine as the methyl

Flavanone 3beta-hydroxylases from rice: key enzymes for favonol and anthocyanin biosynthesis.

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Flavanone 3beta-hydroxylases (F3H) are key enzymes in the synthesis of flavonol and anthocyanin. In this study, three F3H cDNAs from Oryza sativa (OsF3H-1 approximately 3) were cloned by RT-PCR and expressed in E. coli as gluthatione S-transferase (GST) fusion proteins. The purified recombinant

The OsmiR396-OsGRF8-OsF3H-flavonoid pathway mediates resistance to the brown planthopper in rice (Oryza sativa).

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Multi-functional microRNAs (miRNAs) are emerging as key modulators of plant-pathogen interactions. Although the involvement of some miRNAs in plant-insect interactions has been revealed, the underlying mechanisms are still elusive. The brown planthopper (BPH) is the most notorious rice (Oryza

Molecular characterization of flavonoid malonyltransferase from Oryza sativa.

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In this study, a flavonoid malonyltransferase (OsMaT-2) was cloned from Oryza sativa, and the recombinant protein OsMaT-2 was purified via affinity chromatography. OsMaT-2 utilized a variety of flavonoid glucosides, including flavanone glucosides, flavone glucosides, flavonol glucosides, and

Cytochrome P450 93G1 Is a Flavone Synthase II That Channels Flavanones to the Biosynthesis of Tricin O-Linked Conjugates in Rice.

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Flavones are a major class of flavonoids with a wide range of physiological functions in plants. They are constitutively accumulated as C-glycosides and O-linked conjugates in vegetative tissues of grasses. It has long been presumed that the two structural modifications of flavones occur through

Genome-wide searches and molecular analyses highlight the unique evolutionary path of flavone synthase I (FNSI) in Apiaceae.

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Flavone synthase is a key enzyme for flavone biosynthesis and is encoded by two gene families: flavone synthase I (FNSI) and flavone synthase II (FNSII). FNSII is widely distributed in plants, while FNSI has been reported in rice (Oryza sativa) and seven species of Apiaceae. FNSI has likely evolved

Completion of Tricin Biosynthesis Pathway in Rice: Cytochrome P450 75B4 Is a Unique Chrysoeriol 5'-Hydroxylase.

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Flavones are ubiquitously accumulated in land plants, but their biosynthesis in monocots remained largely elusive until recent years. Recently, we demonstrated that the rice (Oryza sativa) cytochrome P450 enzymes CYP93G1 and CYP93G2 channel flavanones en route to flavone O-linked conjugates and

Simultaneous determination of phenolic acids and flavonoids in rice using solid-phase extraction and RP-HPLC with photodiode array detection.

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An analytical method based on an optimized solid-phase extraction procedure and followed by high-performance liquid chromatography (HPLC) separation with diode array detection was developed and validated for the simultaneous determination of phenolic acids (gallic, protocatechuic, 4-hydroxy-benzoic,

The wp mutation of Glycine max carries a gene-fragment-rich transposon of the CACTA superfamily.

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We used soybean (Glycine max) cDNA microarrays to identify candidate genes for a stable mutation at the Wp locus in soybean, which changed a purple-flowered phenotype to pink, and found that flavanone 3-hydroxylase cDNAs were overexpressed in purple flower buds relative to the pink. Restriction

Novel exon combinations generated by alternative splicing of gene fragments mobilized by a CACTA transposon in Glycine max.

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BACKGROUND The recent discoveries of transposable elements carrying host gene fragments such as the Pack-MULEs (Mutator-like transposable elements) of maize (Zea mays), rice (Oryza sativa) and Arabidopsis thaliana, the Helitrons of maize and the Tgm-Express of soybeans, revealed a widespread genetic

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