酵母Gsk-3激酶Mck1在葡萄糖饥饿和细胞壁应激细胞的细胞壁重塑中是必需的。
The Yeast Gsk-3 Kinase Mck1 Is Necessary for Cell Wall Remodeling in Glucose-Starved and Cell Wall-Stressed Cells.
作者信息
Zhang Fan, Tang Yingzhi, Zhou Houjiang, Li Kaiqiang, West James A, Griffin Julian L, Lilley Kathryn S, Zhang Nianshu
机构信息
Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge CB2 1GA, UK.
State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China.
出版信息
Int J Mol Sci. 2025 Apr 9;26(8):3534. doi: 10.3390/ijms26083534.
The cell wall integrity (CWI) pathway is responsible for transcriptional regulation of cell wall remodeling in response to cell wall stress. How cell wall remodeling mediated by the CWI pathway is effected by inputs from other signaling pathways is not well understood. Here, we demonstrate that the Mck1 kinase cooperates with Slt2, the MAP kinase of the CWI pathway, to promote cell wall thickening in glucose-starved cells. Integrative analyses of the transcriptome, proteome and metabolic profiling indicate that Mck1 is required for the accumulation of UDP-glucose (UDPG), the substrate for β-glucan synthesis, through the activation of two regulons: the Msn2/4-dependent stress response and the Cat8-/Adr1-mediated metabolic reprogram dependent on the SNF1 complex. Analysis of the phosphoproteome suggests that similar to mammalian Gsk-3 kinases, Mck1 is involved in the regulation of cytoskeleton-dependent cellular processes, metabolism, signaling and transcription. Specifically, Mck1 may be implicated in the Snf1-dependent metabolic reprogram through PKA inhibition and SAGA (Spt-Ada-Gcn5 acetyltransferase)-mediated transcription activation, a hypothesis further underscored by the significant overlap between the Mck1- and Gcn5-activated transcriptomes. Phenotypic analysis also supports the roles of Mck1 in actin cytoskeleton-mediated exocytosis to ensure plasma membrane homeostasis and cell wall remodeling in cell wall-stressed cells. Together, these findings not only reveal the novel functions of Mck1 in metabolic reprogramming and polarized growth but also provide valuable omics resources for future studies to uncover the underlying mechanisms of Mck1 and other Gsk-3 kinases in cell growth and stress response.
细胞壁完整性(CWI)途径负责响应细胞壁应激对细胞壁重塑进行转录调控。目前尚不清楚CWI途径介导的细胞壁重塑如何受到其他信号通路输入的影响。在此,我们证明Mck1激酶与CWI途径的丝裂原活化蛋白激酶Slt2协同作用,以促进葡萄糖饥饿细胞中的细胞壁增厚。转录组、蛋白质组和代谢谱的综合分析表明,Mck1通过激活两个调控子来积累β-葡聚糖合成的底物尿苷二磷酸葡萄糖(UDPG):Msn2/4依赖的应激反应以及依赖于SNF1复合体的Cat8-/Adr1介导的代谢重编程。磷酸化蛋白质组分析表明,与哺乳动物Gsk-3激酶类似,Mck1参与调控依赖于细胞骨架的细胞过程、代谢、信号传导和转录。具体而言,Mck1可能通过抑制PKA和SAGA(Spt-Ada-Gcn5乙酰转移酶)介导的转录激活参与Snf-1依赖的代谢重编程,Mck1和Gcn5激活的转录组之间的显著重叠进一步强调了这一假设。表型分析也支持Mck1在肌动蛋白细胞骨架介导的胞吐作用中的作用,以确保细胞壁应激细胞中的质膜稳态和细胞壁重塑。总之,这些发现不仅揭示了Mck1在代谢重编程和极化生长中的新功能,还为未来研究揭示Mck1和其他Gsk-3激酶在细胞生长和应激反应中的潜在机制提供了有价值的组学资源。