免疫信息学和MD模拟数据表明,Omicron尖端表位物通过更好的MHC识别与IgG进行更多的相互作用,而不是Delta变体
Aniket Sarkar1, Dipannita Santra1, Anindya Sundar Panja2
1Post-Graduate Department of Biotechnology, Oriental Institute of Science and Technology, Vidyasagar University, Midnapore 721102, West Bengal, India.
International immunopharmacology
|July 27, 2023
概括
这是Omicron变种.
科学领域:
- 病毒学和免疫学 病毒学和免疫学
- 结构生物学 结构生物学
- 计算生物学 计算生物学
背景情况:
- 在2021年底发现的SARS-CoV-2的Omicron变种具有很高的传染性,但死亡率降低.
- 奥米克朗的众多突发突变有助于疫苗逃脱,需要对其免疫相互作用进行进一步调查.
- 了解Omicron的较低炎症潜力对于公共卫生战略至关重要.
研究的目的:
- 为了比较分析SARS-CoV-2变体的尖端蛋白与人类IgG和MHC类I和II分子的相互作用.
- 阐明Omicron免疫逃避和降低病原性的结构基础.
主要方法:
- 使用了计算方法,包括同质模型,分子对接 (HADDOCK2.4/HawkDock) 和分子动力学模拟 (GROMACS).
- 从公共数据库 (NCBI,PDB,GISAID) 中分析了蛋白质结构.
- 使用专用服务器 (Vaxigen,PEP-FOLD3) 评估抗原性和表位特征.
主要成果:
- 奥米克龙尖峰-IgG相互作用显示出最高的表面积和结合,涉及多个IgG识别点.
- 欧米克朗和三角洲变种表现出更好的结构稳定性,在分子动力学模拟中较低的RMSD值表明了这一点.
- 与其他变体相比,Omicron表现出与MHC类I和II分子的最高结合亲和力,这表明免疫识别得到了增强.
结论:
- 奥米克朗对IgG和MHC分子的广泛结合有助于其减少免疫逃避.
- 奥米克朗的尖蛋白的结构稳定性和结合特性为其独特的临床形状提供了洞察力.
- 对Omicron的免疫调节作用进行进一步的研究是有必要的.
相关概念视频
Cross-reactivity
31.3K
Overview
31.3K
Antigens Involved in Adaptive Immunity
544
An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
Complete antigens possess both immunogenicity and...
Complete Antigens
Complete antigens possess both immunogenicity and...
544
Immune Response Against Viral Pathogens
826
The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
826


