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Erg6 作为转录因子 Flo8 的下游效应物,调节白色念珠菌生物膜的形成。

Erg6 Acts as a Downstream Effector of the Transcription Factor Flo8 To Regulate Biofilm Formation in Candida albicans.

机构信息

Department of Natural Product Chemistry, Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, Jinan, Shandong Province, China.

Department of Pharmacy, Qilu Hospital of Shandong University, Jinan, Shandong Province, China.

出版信息

Microbiol Spectr. 2023 Jun 15;11(3):e0039323. doi: 10.1128/spectrum.00393-23. Epub 2023 Apr 26.

Abstract

The yeast-to-hyphal morphotype transition and subsequent biofilm formation are important virulence factors of Candida albicans and are closely associated with ergosterol biosynthesis. Flo8 is an important transcription factor that determines filamentous growth and biofilm formation in C. albicans. However, the relationship between Flo8 and regulation of the ergosterol biosynthesis pathway remains elusive. Here, we analyzed the sterol composition of a -deficient C. albicans strain by gas chromatography-mass spectrometry and observed the accumulation of the sterol intermediate zymosterol, the substrate of Erg6 (C-24 sterol methyltransferase). Accordingly, the transcription level of was reduced in the -deficient strain. Yeast one-hybrid experiments revealed that Flo8 physically interacted with the promoter. Ectopic overexpression of in the -deficient strain partially restored biofilm formation and virulence in a Galleria mellonella infection model. These findings suggest that Erg6 is a downstream effector of the transcription factor Flo8 that mediates the cross talk between sterol synthesis and virulence factors in C. albicans. Biofilm formation by C. albicans hinders its eradication by immune cells and antifungal drugs. Flo8 is an important morphogenetic transcription factor that regulates the biofilm formation and virulence of C. albicans. However, little is known about how Flo8 regulates biofilm formation and fungal pathogenicity. Here, we determined that Flo8 directly binds to the promoter of to positively regulate its transcriptional expression. Consistently, loss of results in the accumulation of the substrate of Erg6. Moreover, ectopic overexpression of at least partially restores the biofilm formation and virulence of the -deficient strain both and . This work provides a new perspective on the metabolic link between transcription factors and morphotypes in C. albicans.

摘要

酵母到菌丝形态转变和随后的生物膜形成是白色念珠菌的重要毒力因子,与麦角固醇生物合成密切相关。 Flo8 是决定白色念珠菌丝状生长和生物膜形成的重要转录因子。然而,Flo8 与麦角固醇生物合成途径的调节之间的关系仍不清楚。在这里,我们通过气相色谱-质谱法分析了 -缺陷型白色念珠菌菌株的甾醇组成,观察到甾醇中间体麦角固醇( Erg6 的底物)的积累。因此, -缺陷型菌株中 的转录水平降低。酵母单杂交实验表明 Flo8 与 启动子发生物理相互作用。在 -缺陷型菌株中异位过表达 部分恢复了生物膜形成和 对大蜡螟感染模型的毒力。这些发现表明 Erg6 是转录因子 Flo8 的下游效应物,介导白色念珠菌中固醇合成与毒力因子之间的串扰。白色念珠菌的生物膜形成阻碍了免疫细胞和抗真菌药物对其的清除。Flo8 是一种重要的形态发生转录因子,调节白色念珠菌的生物膜形成和毒力。然而,对于 Flo8 如何调节生物膜形成和真菌致病性知之甚少。在这里,我们确定 Flo8 直接结合到 启动子上,以正向调节其转录表达。一致地, 缺失导致 Erg6 的底物积累。此外,异位过表达 至少部分恢复了 -缺陷型菌株的生物膜形成和毒力。 和 。这项工作为白色念珠菌中转录因子和形态之间的代谢联系提供了新的视角。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/61f5/10269489/0e5ec7387e57/spectrum.00393-23-f001.jpg

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