MAPKK2/4/5/7-MAPK3-JAZs modulate phenolic acid biosynthesis in Salvia miltiorrhiza.

Yongfeng Xie, Meiling Ding, Xuecui Yin, Guanfeng Wang, Bin Zhang, Lingxiang Chen, Pengda Ma, Juane Dong

Journal: Phytochemistry 2022;199():113177

PMID: 35358599

Full Text on Elsevier Science View on PubMed

Abstract

Phenolic acids are the major bioactive metabolites produced in Salvia miltiorrhiza, a traditional Chinese medicine called Danshen. Many phytohormone elicitor treatments induce phenolic acid biosynthesis, even though the underlying mechanism remains obscure. Expression pattern analysis showed that SmMAPK3 was highly expressed in leaves, and SmMAPK3 was significantly induced by salicylic acid (SA) and methyl jasmonate (JA). Bioinformatics analysis revealed that SmMAPK3 belongs to group A and contains a TEY motif in the activation loop together with three conserved regions (P-loop, C-loop and CD-domain). A previous study speculated that SmMAPK3 is likely a positive regulator in the biosynthesis of phenolic acids in S. miltiorrhiza. In this study, overexpression of SmMAPK3 increased phenolic acid biosynthetic gene expression and enhanced the accumulation of phenolic acids in S. miltiorrhiza plantlets. Yeast two-hybrid (Y2H) analysis and firefly luciferase complementation imaging (LCI) assays revealed that SmMAPKK2/4/5/7-SmMAPK3-SmJAZs form a cascade that regulates the accumulation of phenolic acids. In summary, this work deepens our understanding of the posttranscriptional regulatory mechanisms of phenolic acid biosynthesis and sheds new light on metabolic engineering in S. miltiorrhiza.

Address: College of Life Sciences, Northwest A & F University, Yangling, China. Electronic address: [email protected].; College of Life Sciences, Northwest A & F University, Yangling, China. Electronic address: [email protected].; College of Life Sciences, Northwest A & F University, Yangling, China. Electronic address: [email protected].; College of Life Sciences, Northwest A & F University, Yangling, China. Electronic address: [email protected].; College of Life Sciences, Northwest A & F University, Yangling, China. Electronic address: [email protected].; College of Life Sciences, Northwest A & F University, Yangling, China. Electronic address: [email protected].; College of Life Sciences, Northwest A & F University, Yangling, China. Electronic address: [email protected].; College of Life Sciences, Northwest A & F University, Yangling, China. Electronic address: [email protected].

DOI: 10.1016/j.phytochem.2022.113177

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MeSH Terms: Abietanes, Gene Expression Regulation, Plant, Hydroxybenzoates, Plant Proteins, Plant Roots, Salvia miltiorrhiza