Latvian
Albanian
Arabic
Armenian
Azerbaijani
Belarusian
Bengali
Bosnian
Catalan
Czech
Danish
Deutsch
Dutch
English
Estonian
Finnish
Français
Greek
Haitian Creole
Hebrew
Hindi
Hungarian
Icelandic
Indonesian
Irish
Italian
Japanese
Korean
Latvian
Lithuanian
Macedonian
Mongolian
Norwegian
Persian
Polish
Portuguese
Romanian
Russian
Serbian
Slovak
Slovenian
Spanish
Swahili
Swedish
Turkish
Ukrainian
Vietnamese
Български
中文(简体)
中文(繁體)
Plant Physiology 2014-Jul

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

Rakstu tulkošanu var veikt tikai reģistrēti lietotāji
Ielogoties Reģistrēties
Saite tiek saglabāta starpliktuvē
Pui Ying Lam
Fu-Yuan Zhu
Wai Lung Chan
Hongjia Liu
Clive Lo

Atslēgvārdi

Abstrakts

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 independent metabolic routes. Previously, we reported that cytochrome P450 93G2 (CYP93G2) functions as a flavanone 2-hydroxylase (F2H) that provides 2-hydroxyflavanones for C-glycosylation in rice (Oryza sativa). Flavone C-glycosides are subsequently formed by dehydratase activity on 2-hydroxyflavanone C-glycosides. On the other hand, O-linked modifications were proposed to proceed after the flavone nucleus is generated. In this study, we demonstrate that CYP93G1, the closest homolog of CYP93G2 in rice, is a bona fide flavone synthase II (FNSII) that catalyzes the direct conversion of flavanones to flavones. In recombinant enzyme assays, CYP93G1 desaturated naringenin and eriodictyol to apigenin and luteolin, respectively. Consistently, transgenic expression of CYP93G1 in Arabidopsis (Arabidopsis thaliana) resulted in the accumulation of different flavone O-glycosides, which are not naturally present in cruciferous plants. Metabolite analysis of a rice CYP93G1 insertion mutant further demonstrated the preferential depletion of tricin O-linked flavanolignans and glycosides. By contrast, redirection of metabolic flow to the biosynthesis of flavone C-glycosides was observed. Our findings established that CYP93G1 is a key branch point enzyme channeling flavanones to the biosynthesis of tricin O-linked conjugates in rice. Functional diversification of F2H and FNSII in the cytochrome P450 CYP93G subfamily may represent a lineage-specific event leading to the prevalent cooccurrence of flavone C- and O-linked derivatives in grasses today.

Pievienojieties mūsu
facebook lapai

Vispilnīgākā ārstniecības augu datu bāze, kuru atbalsta zinātne

  • Darbojas 55 valodās
  • Zāļu ārstniecības līdzekļi, kurus atbalsta zinātne
  • Garšaugu atpazīšana pēc attēla
  • Interaktīva GPS karte - atzīmējiet garšaugus atrašanās vietā (drīzumā)
  • Lasiet zinātniskās publikācijas, kas saistītas ar jūsu meklēšanu
  • Meklēt ārstniecības augus pēc to iedarbības
  • Organizējiet savas intereses un sekojiet līdzi jaunumiem, klīniskajiem izmēģinājumiem un patentiem

Ierakstiet simptomu vai slimību un izlasiet par garšaugiem, kas varētu palīdzēt, ierakstiet zāli un redziet slimības un simptomus, pret kuriem tā tiek lietota.
* Visa informācija ir balstīta uz publicētiem zinātniskiem pētījumiem

Google Play badgeApp Store badge