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S41438-021-00630-Y.Pdf Liu et al. Horticulture Research (2021) 8:195 Horticulture Research https://doi.org/10.1038/s41438-021-00630-y www.nature.com/hortres ARTICLE Open Access The basic helix-loop-helix transcription factor TabHLH1 increases chlorogenic acid and luteolin biosynthesis in Taraxacum antungense Kitag ✉ ✉ Qun Liu1,2,3,LiLi2,HaitaoCheng4, Lixiang Yao5,JieWu6,HuiHuang1,WeiNing2 and Guoyin Kai 1 Abstract Polyphenols are the main active components of the anti-inflammatory compounds in dandelion, and chlorogenic acid (CGA) is one of the primary polyphenols. However, the molecular mechanism underlying the transcriptional regulation of CGA biosynthesis remains unclear. Hydroxycinnamoyl-CoA:quinate hydroxycinnamoyl transferase (HQT2) is the last rate-limiting enzyme in chlorogenic acid biosynthesis in Taraxacum antungense. Therefore, using the TaHQT2 gene promoter as a probe, a yeast one-hybrid library was performed, and a basic helix-loop-helix (bHLH) transcription factor, TabHLH1, was identified that shared substantial homology with Gynura bicolor DC bHLH1. The TabHLH1 transcript was highly induced by salt stress, and the TabHLH1 protein was localized in the nucleus. CGA and luteolin concentrations in TabHLH1-overexpression transgenic lines were significantly higher than those in the wild type, while CGA and luteolin concentrations in TabHLH1-RNA interference (RNAi) transgenic lines were significantly lower. Quantitative real- time polymerase chain reaction demonstrated that overexpression and RNAi of TabHLH1 in T. antungense significantly affected CGA and luteolin concentrations by upregulating or downregulating CGA and luteolin biosynthesis pathway genes, especially TaHQT2, 4-coumarate-CoA ligase (Ta4CL), chalcone isomerase (TaCHI), and flavonoid-3′-hydroxylase (TaF3′H). Dual-luciferase, yeast one-hybrid, and electrophoretic mobility shift assays indicated that TabHLH1 directly 1234567890():,; 1234567890():,; 1234567890():,; 1234567890():,; bound to the bHLH-binding motifs of proTaHQT2 and proTa4CL. This study suggests that TabHLH1 participates in the regulatory network of CGA and luteolin biosynthesis in T. antungense and might be useful for metabolic engineering to promote plant polyphenol biosynthesis. – Introduction ranged from 37.12 to 68.89 mg GAE/g4 7. However, these Dandelions (Taraxacum spp.) have been used as medicinal levels in Taraxacum antungense have not been tested in herbs and functional foods for several centuries1,2.The previous studies. Polyphenolic compounds, including phe- increasing demand for dandelion products, such as tea, wine, nolic acids, flavonoids, and anthocyanins, have many biolo- – syrup, and coffee, has promoted the industrialization of gical activities8 10.InTaraxacum antungense Kitag, dandelion production3. The total phenolic compound con- chlorogenic acid (CGA) and caffeic acid (CA) have anti- centrations in different tissues of Taraxacum mongolicum oxidative benefits, being hepatoprotective and having diuretic – activities11 13; rutin and luteolin are used to treat several diseases, such as Parkinson’s disease, severe acute respiratory – Correspondence: Wei Ning ([email protected])or syndrome, hepatitis, and cancer14 16.However,thecon- Guoyin Kai ([email protected]) centration of these functional active constituents in T. 1Laboratory for Core Technology of TCM Quality Improvement and Transformation, College of Pharmacy, School of Pharmaceutical Sciences, The antungense is lower than that in other medicinal plants, such Third Affiliated Hospital, Zhejiang Chinese Medical University, Hangzhou, as Lonicera japonica and Eucommia ulmoides,which Zhejiang 310053, PR China restricts dandelion industrialization14. Bioengineering strate- 2College of Horticulture, Shenyang Agricultural University, Shenyang 110866, China Full list of author information is available at the end of the article gies could potentially increase the polyphenolic compounds These authors contributed equally: Qun Liu, Li Li © The Author(s) 2021 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a linktotheCreativeCommons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. Liu et al. Horticulture Research (2021) 8:195 Page 2 of 14 Fig. 1 Biosynthetic pathway of the main polyphenols (caffeic acid, chlorogenic acid, rutin, and luteolin) in Taraxacum antungense. Phenylalanine ammonia-lyase (PAL); cinnamate 4-hydroxylase (C4H); 4-coumarate-CoA ligase (4CL); Coumarate 3-hydroxylase (C3H); 5-O-(4- coumaroyl)-D-quinate 3′-monooxygenase (C3′H); hydroxycinnamoyl-coenzyme (Co)A shikimate/quinate hydroxycinnamoyl transferase (HCT); hydroxycinnamoyl-CoA quinate hydroxycinnamoyl transferase (HQT); caffeoylshikimate esterase (CSE); UDP-glucosyltransferase (UGT84); Chalcone synthase (CHS); flavonoid synthase (FNS); Chalcone isomerase (CHI); and hydroxycinnamoyl D-glucose quinate hydroxycinnamoyl transferase (HCGQT). Three arrows indicate multi-steps & routes. Blue indicates what has been reported in this article, and gray indicates information from other plants in Taraxacum; however, a better understanding of the plants to synthesize luteolin8,22. Naringenin is also cata- polyphenolic compound biosynthesis pathway is required. lyzed by flavonol-3-dehydrogenase (F3H), flavonol syn- Since the 1990s, the polyphenol biosynthesis pathway thetase (FLS), and UDP-glucoronosyl/UDP-glucosyl – has been reported in several medicinal model plants, such transferase (UFGT) to synthesize rutin23 25. PAL, CHS, as Salvia miltiorrhiza, L. japonica, and Dendranthema CHI, and F3′H increase CGA and luteolin concentrations morifolium17,18. In the first three steps of polyphenol in L. japonica, whereas in Fagopyrum tataricum, the rutin biosynthesis, the key enzymes are phenylalanine concentration is increased by upregulation of FLS and ammonia-lyase (PAL), 4-coumarate-CoA ligase (4CL), UFGT gene expression25,26. Identification of these poly- and cinnamate 4-hydroxylase (C4H), which catalyze the phenol biosynthesis pathway genes will lay the foundation synthesis of p-coumaroyl-CoA from phenylalanine19.CA for further genetic engineering research in T. antungense is directly catalytically synthesized by coumarate (Fig. 1). 3-hydroxylase from p-coumaroyl-CoA, whereas CGA is Plant polyphenolic compounds are important compo- catalytically synthesized by hydroxycinnamoyl CoA qui- nents acting against biotic and abiotic stresses21,25. Plant nate hydroxycinnamoyl transferase (HQT) and transcription factor (TF) family members, such as hydroxycinnamoyl-CoA shiki-mate/quinate hydro- MYB11/12/111 and WRKY18/40/60, respond to biotic xycinnamoyl transferase (HCT)20. However, in T. antun- and abiotic stress to regulate the expression of down- gense, only HQTs (TaHQT1/2) have been isolated, stream structural genes and ultimately promote the bio- identified, and assessed, and TaHQT2 is the last rate- synthesis of polyphenols18,19,27. Coexpression analysis of limiting enzyme in chlorogenic acid biosynthesis21. For TFs and biosynthesis pathway gene expression levels often flavonoids, p-coumaroyl-CoA is a branch and precursor showed a highly linear relationship27,28. Thus, TFs may be compound. The first two steps in the catalytic synthesis of used as a tool not only to improve a plant’s ability to adapt naringenin from p-coumaroyl-CoA are via chalcone syn- to the environment but also to increase polyphenolic thase and chalcone isomerase (CHS and CHI, respec- compound production in plants21. tively)8. Naringenin is catalyzed by flavonoid synthase and Basic helix-loop-helix (bHLH) TFs are one of the largest flavonoid-3′-hydroxylase (FNS and F3′H, respectively) in families that regulate the expression of key enzyme genes Liu et al. Horticulture Research (2021) 8:195 Page 3 of 14 in plants28. Among these TFs, myelocytomatosis onco- TGA-box, and light-responsive elements (Fig. S1 and gene (MYC) TFs (representative bHLH TFs) often parti- Table S2). A Y1H cDNA library of T. antungense was cipate in secondary metabolite accumulation: AaMYC2 created with a titer of approximately 5 × 107 colony- (Artemisia annua L) regulates artemisinin biosynthesis, forming units/mL. PCR results showed that the length of NtMYC2 (Nicotiana tabacum) regulates nicotine bio- T. antungense cDNA ranged from 200–2000 bp (Fig. S2). synthesis, and CrMYC2 (Catharanthus roseus) regulates A 200 bp DNA fragment containing four E-boxes (pro- the expression of alkaloid biosynthesis genes that respond TaHQT2-E-box-1, -2, -3, and -4) that were identified in to methyl jasmonate (MeJA)29,30. In the medicinal model proTaHQT2 (from –685 to –810) within 860 bp of the plant S. miltiorrhiza, SmMYC2a/2b regulates key enzyme ATG start codon was cloned. The isolated gene coding genes for phenolic acid biosynthesis31. Upregulation of protein was able to bind to the proTaHQT2 CATGTG SmPAL by SmbHLH37 leads to increased phenolic motif (Fig. 2). The results also
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