结核菌分泌的毒性因子Rv1435c/hsr1破坏了宿主snRNP的生物发生
Komal Chauhan1, Dipanwita Datta1, Yogita Kapoor2,3
1Cellular Immunology Group, International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi 110067, India.
概括
结核菌菌 (Mtb) 使用一种分泌的蛋白质,Rv1435c/hsr1,通过干扰结合体组件来破坏宿主RNA拼接. 这种毒性因子会损害抗菌反应,是结核病的潜在治疗点.
科学领域:
- 分子生物学分子生物学
- 免疫学 免疫学 免疫学
- 微生物学 微生物学
背景情况:
- 宿主转录适应对于对抗Mycobacterium tuberculosis (Mtb) 感染至关重要.
- Mtb操纵宿主RNA拼接以抑制抗菌反应,但潜在的机制尚不清楚.
研究的目的:
- 为了阐明Mtb改变宿主RNA剪接的机制.
- 为了确定参与调节宿主拼接因子的特定Mtb蛋白质.
- 评估已识别的Mtb蛋白在Mtb病变发生和作为潜在的治疗点中的作用.
主要方法:
- 高通量酵母-2-混合查以确定与宿主拼接因子相互作用的Mtb分泌蛋白质.
- 定制的细胞内测试来分析Mtb蛋白对RNA剪接的影响.
- 基因删除研究 (Δhsr1菌株) 以评估Mtb.的体内和体外毒性.
- 感染小鼠和人类活检组织样本的免疫组织化学分析.
主要成果:
- 一种分泌的Mtb蛋白,Rv1435c/hsr1 (宿主拼接调节器1),被确定为改变宿主拼接的关键参与者.
- Rv1435c/hsr1直接与Mtb胞体,U5 snRNA和SNRPF相互作用,扰乱了胞体生物发生,并引起了特定的外因子跳跃事件.
- 删除Rv1435c/hsr1 (Δhsr1) 减弱了巨细胞和小鼠的Mtb毒性,扭转了拼接变化.
- 在感染的小鼠组织和人类肠道结核病活检中观察到hsr1-依赖的SNRPF染色.
结论:
- Mtb利用毒性因子hsr1来破坏宿主结合体生物发生,从而逃避抗菌反应.
- 通过hsr1介导的RNA剪接的破坏对于mtb的发病过程至关重要.
- 主体和Mtb拼接调节剂代表了结核病治疗的新型治疗点.
更多相关视频
09:13Using Reverse Genetics to Manipulate the NSs Gene of the Rift Valley Fever Virus MP-12 Strain to Improve Vaccine Safety and Efficacy
Published on: November 1, 2011
17.5K
06:18Measurement of Specific Mycobacterial Mistranslation Rates with Gain-of-function Reporter Systems
Published on: April 26, 2019
6.1K
相关概念视频
Rous Sarcoma Virus (RSV) and Cancer
5.4K
Rous Sarcoma virus or RSV was discovered by F. Peyton Rous in the year 1911 as a filterable transmissible agent that could cause tumors in chickens. He won a Nobel Prize for this discovery in 1966. His experiments clearly demonstrated that some cancers could be caused by infectious agents and led to the discovery of many more cancer-causing viruses in animals as well as humans.
RSV is a retrovirus that contains two copies of a plus-strand RNA genome. Its genome consists of four main open...
RSV is a retrovirus that contains two copies of a plus-strand RNA genome. Its genome consists of four main open...
5.4K
Translational Regulation
108
Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
108
Leaky Scanning
5.2K
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R...
5.2K
Riboswitches
8.7K
Riboswitches are non-coding mRNA domains that regulate the transcription and translation of downstream genes without the help of proteins. Riboswitches bind directly to a metabolite and can form unique stem-loop or hairpin structures in response to the amount of the metabolite present. They have two distinct regions – a metabolite-binding aptamer and an expression platform.
The aptamer has high specificity for a particular metabolite which allows riboswitches to specifically regulate...
The aptamer has high specificity for a particular metabolite which allows riboswitches to specifically regulate...
8.7K
Types of RNA
65.6K
Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
65.6K
