Functional exploration of a deep Mycobacterium tuberculosis phosphoproteome

结核分枝杆菌深层磷酸蛋白质组的功能探索

• 批准号: 10656957
• 负责人: Christoph Grundner
• 金额: $ 61.73万
• 依托单位: SEATTLE CHILDREN'S HOSPITAL
• 依托单位国家: 美国
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-02-03 至 2028-01-31
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/10656957
• 关键词: Affect; Arginine; Bacillus subtilis; Bacteria; Biology; Chromosomes; DNA Binding; Data; Environment; Eukaryota; Event; Family; Gene Expression; Genes; Genetic Transcription; Gram-Positive Bacteria; Individual; Maps; Mass Spectrum Analysis; Measures; Mediating; Modification; Mutation; Mycobacterium tuberculosis; Organism; Output; Pathogenesis; Pathway interactions; Phenotype; Phosphoric Monoester Hydrolases; Phosphorylation; Phosphorylation Site; Phosphotransferases; Physiological; Post-Translational Protein Processing; Proteins; Proteolysis; Regulation; Role; Signal Pathway; Signal Transduction; Substrate Interaction; System; Testing; Transcriptional Regulation; Tuberculosis; Virulence; Virulence Factors; endopeptidase Clp; gain of function; loss of function; mimetics; mutant; novel; phosphoproteomics; preservation; protein degradation; transcription factor; transcriptomics

ABSTRACT Phosphosignaling provides the major conduit for bacterial adaptation. The two component systems (TCSs) have long been viewed as the canonical phosphosignaling systems in bacteria, but increasingly, O- phosphorylation mediated by Ser/Thr kinases is recognized as a relevant bacterial phosphosignaling mechanism as well. We now show that in fact, Mycobacterium tuberculosis (Mtb) has an expansive, distributed, and cooperative O-phosphorylation system of a size and complexity that is typically only associated with eukaryotes. By using a comprehensive STPK loss- and gain-of-function mutant panel and quantitative mass spectrometry, we show that >70% of Mtb proteins are phosphorylated on Ser/Thr/Tyr, identify thousands of individual Ser/Thr kinase substrates, and show that the Ser/Thr kinases collectively control the expression of ~30% of Mtb genes. Here, we will test a new and extensive regulatory connection between the Ser/Thr kinases and the His kinases of the TCSs and test the role of O-phosphorylation on the regulation of transcription factors. As a result of our exhaustive analysis of Mtb phosphorylation, we also obtained the first evidence of Arg phosphorylation in Mtb- the first bacterial Arg phosphoproteome outside of gram-positive bacteria. We will identify the relevant phosphoenzymes and test the idea that pArg functions as a degradation tag for ClpP- mediated proteolysis.

摘要