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植物研究 ›› 2025, Vol. 45 ›› Issue (4): 491-503.doi: 10.7525/j.issn.1673-5102.2025.04.003

• 研究论文 • 上一篇    下一篇

钩藤水杨酸响应基因UrSTR4参与钩藤碱合成

许国菊, 郭飘雪, 朱寻然, 杨兹梅, 成环宇, 强玮()   

  1. 贵州大学生命科学学院,农业生物工程研究院,山地生态与农业生物工程协同创新中心,山地植物资源保护与种质创新教育部重点实验室,贵阳 550025
  • 收稿日期:2025-06-05 出版日期:2025-07-20 发布日期:2025-07-25
  • 通讯作者: 强玮 E-mail:wayneqiang@126.com
  • 作者简介:许国菊(1999—),女,硕士研究生,主要从事植物学研究。
  • 基金资助:
    贵州省基础研究(自然科学)项目(黔科合基础-ZK[2022]一般096,黔科合基础MS[2025]667,黔科合基础-ZK[2024]一般502);国家自然科学基金项目(32460146)

The Salicylic Acid Responsive UrSTR4 Gene is Involved in Rhynchophylline Biosynthesis in Uncaria rhynchophylla

Guoju XU, Piaoxue GUO, Xunran ZHU, Zimei YANG, Huanyu CHENG, Wei QIANG()   

  1. Key Laboratory of Plant Resource Conservation and Germplasm Innovation in Mountainous Region(Ministry of Education),Collaborative Innovation Center for Mountain Ecology and Agro-Bioengineering,Institute of Agro-bioengineering,College of Life Science,Guizhou University,Guiyang 550025
  • Received:2025-06-05 Online:2025-07-20 Published:2025-07-25
  • Contact: Wei QIANG E-mail:wayneqiang@126.com

摘要:

钩藤(Uncaria rhynchophylla)是我国传统中药材,其活性成分钩藤碱(RIN)和异钩藤碱(IRN)具有显著药理活性。异胡豆苷合成酶(STR)是RIN和IRN合成的关键酶,但其基因家族在钩藤中的功能分化尚不明确。该研究基于遮阴、乙烯处理下钩藤转录组及全长转录组数据,系统鉴定了27个钩藤STR基因家族成员(UrSTR1~UrSTR27)。进化分析表明,钩藤UrSTR基因家族显著扩张,可能通过功能分化响应不同环境信号。通过外源水杨酸(SA)处理发现,0.6 mmol·L-1 SA处理显著提升钩藤叶片RIN和IRN含量,并强烈诱导UrSTR4基因表达,该基因相对表达水平提高至对照的30.6倍。多序列比对显示,UrSTR4基因编码蛋白虽缺失典型催化位点Glu-309,但与喜树CaSTR3基因编码蛋白具有相似羟基氨基酸残基。为验证其功能,首次建立基于植物活体转化系统的钩藤高效瞬时转化体系,转化最佳条件:8 kPa气压,1 min农杆菌侵染。瞬时过表达UrSTR4基因使RIN和IRN含量分别提高至对照的1.96倍和1.82倍。该研究为钩藤药用成分的代谢调控提供了新靶点,建立的瞬时转化体系为UrSTR基因功能研究提供了技术支撑。

关键词: 钩藤, 异胡豆苷合成酶, 水杨酸, 瞬时转化, 单萜吲哚生物碱

Abstract:

Uncaria rhynchophylla is a traditional Chinese medicinal herb, whose active components rhynchophylline(RIN) and isorhynchophylline(IRN) exhibit remarkable pharmacological activities. Strictosidine synthase(STR) is the key enzyme for RIN and IRN biosynthesis, yet the functional divergence of STR gene family in U. rhynchophylla remains unclear. Utilizing transcriptome data of U. rhynchophylla seedlings under shading and ethylene treatments, 27 STR genes(UrSTR1-UrSTR27) were systematically identified in U. rhynchophylla. Evolutionary analysis revealed significant expansion of UrSTR gene family, suggesting functional diversification in response to environmental cues. Exogenous salicylic acid(SA) treatment(0.6 mmol·L-1) markedly increased RIN and IRN contents, while upregulating UrSTR4 expression level by 30.6-fold. Multiple sequence alignment showed UrSTR4 lacked the conserved Glu-309 residue but shared hydroxyl-containing residues with Camptotheca STR3. An efficient transient transformation system(8 kPa pressure, 1-min Agrobacterium infection) was established by using plant living transformation instrument. The transient overexpression of UrSTR4 enhanced RIN and IRN contents by 1.96- and 1.82-fold, respectively. This study identified new targets for metabolic regulation of bioactive compounds in U. rhynchophylla and the established transient transformation system provided technical support for functional research on UrSTR genes.

Key words: Uncaria rhynchophylla, strictosidine synthase, salicylic acid, transient transformation, monoter-penoid indole alkaloids

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