人类滴滴病毒包裹糖蛋白质的表征
Yannick Munyeku-Bazitama1,2,3, Takeshi Saito1, Takanari Hattori1
1Division of Global Epidemiology, International Institute for Zoonosis Control, Hokkaido University, Sapporo, Japan.
Journal of virology
|July 2, 2024
概括
这项研究特征了人体滴滴病毒糖蛋白,揭示了它们在细胞进入和热带性作用中的作用. 这些发现为开发诊断和治疗方法提供了对这些新兴病毒的见解.
科学领域:
- 病毒学 病毒学
- 分子生物学分子生物学
- 免疫学 免疫学 免疫学
背景情况:
- 提伯病毒是新兴的拉布病毒,感染人类,牛和关节动物,有四种已知的人类菌株:低刚果病毒 (BASV),Ekpoma病毒1 (EKV-1),Ekpoma病毒2和Mundri病毒.
- 尽管它们与严重疾病和高死亡率有关,但由于缺乏病毒隔离,它们的生物特性,包括病毒热带性和病原性,仍然在很大程度上是未知的.
研究的目的:
- 鉴定人类小结杆病毒的葡萄糖蛋白 (G),这是病毒热带性和致病性的关键决定因素.
- 为了研究人型型肺炎病毒糖蛋白之间的结构,抗原和细胞热带性差异.
- 为开发针对这些新型病毒的诊断工具,疫苗和治疗提供关键信息.
主要方法:
- 对人类Tibrovirus Gs.的主要结构和保存的囊蛋白残留物的比较分析.
- 使用内葡萄糖酶H和-N-葡萄糖酶F进行糖化验证.
- 3D结构的AlphaFold预测和低pH诱导的膜融合的评估.
- 产生病毒样颗粒 (VLP) 和产生小鼠抗菌素,用于交叉中和试验.
- 对细胞附着因子的研究,包括人类C型莱克和T细胞免疫球蛋白粘素1,以及对各种细胞系的病毒热带的分析.
主要成果:
- 人类滴状病毒Gs共享保存的初级结构和14个囊残留物,尽管总体氨基酸同质性较低 (29%-48%).
- AlphaFold预测了类似的3D结构,膜融合是由酸性pH值诱导的,形状变化是可逆的.
- 抗滴杆病毒VLPs的抗菌素显示出有限的交叉中和,表明具有明显的抗原性质.
- 人类C型莱克和T细胞免疫球蛋白粘素1被确定为附着因子,BASV-G显示出最高的利用率.
- 病毒感染了广泛的细胞系,对人类细胞表现出偏好的热带性,而EKV-1与其他人类滴状病毒相比,表现出独特的热带性.
结论:
- 这项研究阐明了人类小结杆病毒糖蛋白的关键结构和功能性质,包括它们在细胞进入和热带化中的作用.
- 研究结果突出显示了人类型病毒之间独特的抗原特征和有限的交叉中和.
- 这项研究提供了对人型藏经病毒生物学的基本见解,对于开发对这些新出现的病原体进行有效干预至关重要.
相关概念视频
02:33Retroviruses
12.2K
Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...
12.2K
02:28Leaky Scanning
5.1K
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...
5.1K
00:56Viral Structure
62.1K
Viruses are extraordinarily diverse in shape and size, but they all have several structural features in common. All viruses have a core that contains a DNA- or RNA-based genome. The core is surrounded by a protective coat of proteins called the capsid. The capsid is composed of subunits called capsomeres. The capsid and genome-containing core are together known as the nucleocapsid.
62.1K
01:14Rab Proteins
3.9K
Rab proteins constitute the largest family of monomeric GTPases, of which 70 members are present in humans. Rab proteins and their effectors regulate consecutive stages of vesicle transport such as vesicle transport, docking, and fusion to the correct recipient membrane.
Rab proteins switch between a cytosolic, GDP-bound inactive state and a membrane-anchored, GTP-bound active state. By themselves, Rabs show slow rates of GDP/GTP exchange and GTP hydrolysis. Thus, Rab proteins are considered...
Rab proteins switch between a cytosolic, GDP-bound inactive state and a membrane-anchored, GTP-bound active state. By themselves, Rabs show slow rates of GDP/GTP exchange and GTP hydrolysis. Thus, Rab proteins are considered...
3.9K