The parallel biosynthesis routes of hyperoside from naringenin in Hypericum monogynum  

作　　者：Yingying Wang Zhirong Cui Qianqian Li Shuai Zhang Yongyi Li Xueyan Li Lingyi Kong Jun Luo 

机构地区：[1]Jiangsu Key Laboratory of Bioactive Natural Product Research and State Key Laboratory of Natural Medicines,Department of Traditional Chinese Pharmacy,China Pharmaceutical University,Nanjing 210009,China

出　　处：《Horticulture Research》2023年第9期247-259,共13页园艺研究（英文）

基　　金：supported by the National Natural Science Foundation of China(No.32070389);the‘Double First-Class’University project of China Pharmaceutical University(CPU2022QZ29).

摘　　要：Hyperoside is a bioactive flavonoid galactoside in both medicinal and edible plants.It plays an important physiological role in the growth of flower buds.However,the hyperoside biosynthesis pathway has not been systematically elucidated in plants,including its original source,Hypericaceae.Our group found abundant hyperoside in the flower buds of Hypericum monogynum,and we sequenced its transcriptome to study the biosynthetic mechanism of hyperoside.After gene screening and functional verification,four kinds of key enzymes were identified.Specifically,HmF3Hs(flavanone 3-hydroxylases)and HmFLSs(flavonol synthases)could catalyze flavanones into dihydroflavonols,as well as catalyzing dihydroflavonols into flavonols.HmFLSs could also convert flavanones into flavonols and flavones with varying efficiencies.HmF3′H(flavonoid 3′-hydroxylase)was found to act broadly on 4′-hydroxyl flavonoids to produce 3′,4′-diydroxylated flavanones,dihydroflavonols,flavonols,and flavones.HmGAT(flavonoid 3-O-galactosyltransferase)would transform flavonols into the corresponding 3-O-galactosides,including hyperoside.The parallel hyperoside biosynthesis routes were thus depicted,one of which was successfully reconstructed in Escherichia coli BL21(DE3)by feeding naringenin,resulting in a hyperoside yield of 25 mg/l.Overall,this research not only helped us understand the interior catalytic mechanism of hyperoside in H.monogynum concerning flower development and bioactivity,but also provided valuable insights into these enzyme families.

关 键 词：INTERIOR concerning HYPER 

分 类 号：S662.1[农业科学—果树学]