Identification of F-Box Proteins in Toxoplasma

弓形虫中 F-Box 蛋白的鉴定

• 批准号: 9974899
• 负责人: Ira J Blader
• 金额: $ 24.78万
• 依托单位: STATE UNIVERSITY OF NEW YORK AT BUFFALO
• 依托单位国家: 美国
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-02-07 至 2022-01-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/9974899
• 关键词: 26S proteasome; Address; Affect; Affinity; Animal Model; Animals; Biological Process; CRISPR screen; Cell Cycle; Cell physiology; Cells; Complex; Cullin Proteins; Cytoskeleton; Daughter; Enzymes; Eukaryota; F Box Domain; F-Box Proteins; Family; Genetic Transcription; Genome; Goals; Growth; Human; Hydroxylation; Lead; Lytic Phase; Mediating; Membrane; Modeling; Names; Paper; Parasites; Pathway interactions; Polyubiquitin; Protein Subunits; Proteins; Proteome; Proteomics; PubMed; RBX1 gene; Reporting; Role; Signal Transduction; Specificity; Toxoplasma; Toxoplasma gondii; Ubiquitin; Ubiquitination; Virulence; Work; arm; daughter cell; design; fitness; genome-wide; glycosylation; indexing; insight; novel; novel therapeutics; pathogen; plant fungi; protein degradation; protein function; receptor; recruit; scaffold; trafficking; ubiquitin-protein ligase

The SKP1/Cullin/F-box (SCF) class of E3 Ubiquitin Ligases is an evolutionarily conserved family of enzymes that regulate key cellular processes including the cell cycle, membrane trafficking, and signaling. The SCF-E3 is composed of four core components - Rbx1, Cullin1, SKP1, and a F-box protein. F-box proteins are the subunits that recruit substrate proteins to be poly-ubiquitinated by the SCF-E3, and they can also be directly poly-ubiquitinated. SCF-E3 dependent polyubiquitin serves as a signal for targeting to and degradation by the 26S-proteasome. Every eukaryote expresses a repertoire of F-box proteins, the majority of which have different affinities for different substrate proteins. Thus, F-box proteins are critical since they dictate which specific proteins will be ubiquitinated by the SCF-E3. In addition, F-box proteins can function independently of the SCF-E3. Thus, identifying and characterizing F-box proteins is central to understanding the functions of the SCF-E3 and remodeling of the proteome as cells engage new functions. This is important because protein degradation is as important as gene transcription in defining a cell's proteome. Here, we will identify essential SCF-E3 dependent F-box proteins, determine why they are essential, and identify the proteins that are their ubiquitination substrates. These studies will reveal how ubiquitin supports growth and virulence of a major human parasite. In addition, these findings will be relevant to related pathogens given the conservation of the SCF- E3 and many F-box proteins between Toxoplasma and other apicomplexan parasites.

E3泛素连接酶的SKP1/cullin/f-box（SCF）类是进化 保守的酶家族，调节包括细胞在内的关键细胞过程 循环，膜运输和信号传导。 SCF-E3由四个核心组成 组件-RBX1，Cullin1，SKP1和F -box蛋白。 F-box蛋白是 募集底物蛋白的亚基是由SCF-E3衍生的，它们是 也可以直接泛素化。 SCF-E3依赖性泛素蛋白用作 靶向和降解的信号由26S-蛋白酶体降解。每个真核生物 表达F-box蛋白的曲目，其中大多数具有不同的亲和力 用于不同的底物蛋白。因此，f-box蛋白至关重要，因为它们决定了哪个 特异性蛋白将被SCF-E3泛素化。另外，F-box蛋白可以 独立于SCF-E3的功能。因此，识别和表征F-box 蛋白质是了解SCF-E3的功能和重塑的核心 蛋白质组随着细胞参与新功能。这很重要，因为蛋白质降解 在定义细胞蛋白质组时与基因转录一样重要。在这里，我们将确定 必需的SCF-E3依赖F-box蛋白，确定它们为什么是必不可少的，并且 确定蛋白质是其泛素化底物。这些研究将揭示 泛素如何支持主要人类寄生虫的生长和毒力。此外， 考虑到SCF-的保护，这些发现将与相关病原体有关 E3和许多F-box蛋白质之间的毒素和其他Apicomplexan寄生虫之间的蛋白质。