The Kelch Repeat Protein VdKeR1 Is Essential for Development, Ergosterol Metabolism, and Virulence in Verticillium dahliae

IF 4.2 2区生物学 Q2 MICROBIOLOGY

Journal of Fungi Pub Date : 2024-09-09 DOI:10.3390/jof10090643

Wen-Li Xia, Zhe Zheng, Feng-Mao Chen

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引用次数: 0

Abstract

Verticillium dahliae is a soil-borne fungal pathogen that can cause severe vascular wilt in many plant species. Kelch repeat proteins are essential for fungal growth, resistance, and virulence. However, the function of the Kelch repeat protein family in V. dahliae is unclear. In this study, a Kelch repeat domain-containing protein DK185_4252 (VdLs.17 VDAG_08647) included in the conserved VdPKS9 gene cluster was identified and named VdKeR1. Phylogenetic analysis demonstrated a high degree of evolutionary conservation of VdKeR1 and its homologs among fungi. The experimental results showed that the absence of VdKeR1 impaired vegetative growth, microsclerotia development, and pathogenicity of V. dahliae. Osmotic and cell wall stress analyses suggested that VdKeR1-deleted mutants were more tolerant to NaCl, sorbitol, CR, and CFW, while more sensitive to H2O2 and SDS. In addition, analyses of the relative expression level of sqe and the content of squalene and ergosterol showed that VdKeR1 mediates the synthesis of squalene and ergosterol by positively regulating the activity of squalene epoxidase. In conclusion, these results indicated that VdKeR1 was involved in the growth, stress resistance, pathogenicity, and ergosterol metabolism of V. dahliae. Investigating VdKeR1 provided theoretical and experimental foundations for subsequent control of Verticillium wilt.

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Kelch 重复蛋白 VdKeR1 对大丽轮枝菌的发育、麦角甾醇代谢和毒性至关重要

大丽轮枝菌（Verticillium dahliae）是一种土传真菌病原体，可导致多种植物严重维管束枯萎。Kelch 重复蛋白对真菌的生长、抗性和毒力至关重要。然而，Kelch 重复蛋白家族在大丽花病毒中的功能尚不清楚。本研究鉴定了包含在保守的 VdPKS9 基因簇中的含 Kelch 重复结构域的蛋白 DK185_4252 (VdLs.17 VDAG_08647)，并将其命名为 VdKeR1。系统进化分析表明，VdKeR1 及其同源物在真菌中具有高度的进化保守性。实验结果表明，VdKeR1的缺失会影响大丽花病毒的无性生长、小硬菌丝的发育和致病性。渗透胁迫和细胞壁胁迫分析表明，缺失 VdKeR1 的突变体对 NaCl、山梨醇、CR 和 CFW 更耐受，而对 H2O2 和 SDS 更敏感。此外，对 sqe 的相对表达水平以及角鲨烯和麦角甾醇含量的分析表明，VdKeR1 通过正向调节角鲨烯环氧化酶的活性来介导角鲨烯和麦角甾醇的合成。总之，这些结果表明，VdKeR1 参与了大丽花病毒的生长、抗逆性、致病性和麦角固醇代谢。对 VdKeR1 的研究为以后防治轮纹枯萎病提供了理论和实验基础。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Fungi Medicine-Microbiology (medical)

CiteScore

6.70

自引率

14.90%

发文量

1151

审稿时长

11 weeks

期刊介绍： Journal of Fungi (ISSN 2309-608X) is an international, peer-reviewed scientific open access journal that provides an advanced forum for studies related to pathogenic fungi, fungal biology, and all other aspects of fungal research. The journal publishes reviews, regular research papers, and communications in quarterly issues. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on paper length. Full experimental details must be provided so that the results can be reproduced.