高等学校化学学报 ›› 2024, Vol. 45 ›› Issue (2): 20230444.doi: 10.7503/cjcu20230444

• 有机化学 • 上一篇    下一篇

新型吡唑乙酰胺类琥珀酸脱氢酶抑制剂的设计、 合成及抑菌活性

王晓斌1,2(), 董雪1, 王瑞颖1, 张娟2, 王濛琪3, 张宗群1, 杨婷玉1, 许梦寒1()   

  1. 1.江苏海洋大学药学院, 江苏省海洋药物活性分子筛选重点实验室,
    2.海洋工程学院, 海洋工程技术研究中心, 连云港 222005
    3.南京农业大学理学院, 江苏省农药学重点实验室, 南京 210095
  • 收稿日期:2023-10-16 出版日期:2024-02-10 发布日期:2023-11-27
  • 通讯作者: 王晓斌,许梦寒 E-mail:xb_wang@jou.edu.cn;lidong.xu@foxmail.com
  • 基金资助:
    国家自然科学基金(32202334);江苏省高等学校自然科学基金(22KJB210009);江苏海洋大学人才引进项目(KQ21031);江苏海洋大学研究生科研与实践创新计划项目(KYCX202340)

Design, Synthesis and Antifungal Activities of Novel Succinate Dehydrogenase Inhibitors Bearing a Pyrazolyl Acetamide Scaffold

WANG Xiaobin1,2(), DONG Xue1, WANG Ruiying1, ZHANG Juan2, WANG Mengqi3, ZHANG Zongqun1, YANG Tingyu1, XU Menghan1()   

  1. 1.Jiangsu Key Laboratory of Marine Pharmaceutical Compound Screening,College of Pharmacy
    2.Research Center of Ocean Engineering Technology,School of Ocean Engineering,Jiangsu Ocean University,Lianyungang 222005,China
    3.Jiangsu Key Laboratory of Pesticide Science,College of Sciences,Nanjing Agricultural University,Nanjing 210095,China
  • Received:2023-10-16 Online:2024-02-10 Published:2023-11-27
  • Contact: WANG Xiaobin, XU Menghan E-mail:xb_wang@jou.edu.cn;lidong.xu@foxmail.com
  • Supported by:
    the National Natural Foundation of China(32202334);the Natural Science Foundation of Jiangsu University, China(22KJB210009);the Research Fund for Talent Introduction of Jiangsu Ocean University, China(KQ21031);the Postgraduate Research & Practice Innovation Program of Jiangsu Ocean University, China(KYCX202340)

摘要:

为开发出新型杀菌剂候选分子, 通过柔性改造吡唑甲酰胺杀菌剂结构中的二元酰胺键得到了一系列 潜在靶向真菌琥珀酸脱氢酶(SDH)的新型吡唑乙酰胺分子. 借助菌丝生长速率法发现了其中具有广谱抑菌 特性的二苯醚联吡唑乙酰胺分子(6l), 其在药剂质量浓度为50 μg/mL时对水稻纹枯病菌、 小麦赤霉病菌和草 莓灰霉病菌的抑制效果均优于对照药剂噁霉灵. 化合物6l对水稻纹枯病菌的半最大效应浓度(EC50值)为 19.92 μg/mL, 抑菌活性明显优于对照药剂噁霉灵和氟吡菌酰胺(EC50分别为76.74和40.36 μg/mL). SDH酶活力测试结果表明, 真菌体内的SDH是化合物6l抑制水稻纹枯病菌生长的潜在作用靶标. 分子对接研究结果显示, 化合物6l分子结构中的二苯醚单元能以多种方式与靶标口袋的关键残基结合, 对分子发挥抑菌活性起到了关键作用. 研究结果表明, 二苯醚联吡唑乙酰胺分子对植物病原真菌具有较显著的抑制作用, 在其结构基础上进行深度的优化和改造有望得到可有效防控植物病原真菌的新型杀菌剂候选分子.

关键词: 抑菌先导发现, 吡唑乙酰胺, 植物病原真菌, 琥珀酸脱氢酶抑制剂

Abstract:

Aiming to search for novel fungicide candidates, a series of novel pyrazolyl acetamides potentially targeting fungal succinate dehydrogenase(SDH) were constructed by flexibly reinventing the dualistic amide linkage that emerges in the structure of pyrazole-4-carboxamide fungicides. The diphenylether-containing pyrazole-4- acetamide(6l) featuring broad-spectrum antifungal effects was screened via a mycelium growth rate method. The above molecule exhibited the conspicuous inhibitory effect against Rhizoctonia solaniFusarium graminearum and Botrytis cinerea at 50 μg/mL, with the inhibitory rates that were slightly better than that of hymexazol. Strikingly, the median effective concentration(EC50) of compound 6l against R. solani was estimated as 19.92 μg/mL that is better than that of hymexazol(76.74 μg/mL) and fluopyram(40.36 μg/mL). The bioactive evaluations against SDH indicated that a fungal SDH was the potential target of compound 6l for inhibiting R. solani. Subsequently, molecular docking studies implied that the diphenylether unit emerging in the structure of compound 6l could multiply interact with the pivotal residues locating at SDH protein pockets, which plays a critical role in guaranteeing the antifungal effect of diphenylether-containing pyrazole-4-acetamides. The above researches indicated that the diphenylether- containing pyrazole-4-acetamides exhibit obviously inhibitory effects against phytopathogenic fungi, and could be further optimized for developing novel fungicide candidates that could effectively control phytopathogenic fungi.

Key words: Discovery of antifungal lead, Pyrazolyl acetamide, Phytopathogenic fungi, Succinate dehydrogenase inhibitor

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