通过PROTAC介导的HIV-1 Nef降解有效地恢复细胞表面的CD4和MHC-I表达,并阻止HIV-1复制
bioRxiv : the preprint server for biology
|August 30, 2023
概括
科学家们开发了向仿真体 (PROTACs) 的蛋白质溶解来降解HIV-1 Nef蛋白,这是病毒持久性和免疫逃避的关键因素. 这种新的方法为开发针对HIV的新抗逆转录病毒疗法提供了一个有希望的策略.
科学领域:
- 病毒学 病毒学
- 分子生物学分子生物学
- 药物发现 药物发现 药物发现
背景情况:
- 人类免疫缺陷病毒1型 (HIV-1) Nef蛋白对于病毒复制和病变产生至关重要.
- 尼夫通过降低关键细胞表面受体 (如MHC-I和CD4) 的下调来促进免疫逃避和病毒的持续性.
- 尼夫缺乏酶活性,这给传统药物开发带来了挑战.
研究的目的:
- 开发蛋白质分解向仿真体 (PROTACs) 用于针对HIV-1 Nef蛋白的向降解.
- 调查Nef导向的PROTACs在降低病毒载荷和恢复免疫功能的有效性.
主要方法:
- 通过将Nef结合化合物合到E3结合酶连接体,设计和合成双价PROTACs.
- 使用Cereblon (CRBN) E3泛酸酶诱导Nef的泛化和随后的蛋白质分解降解.
- 评估PROTACs能够逆转T细胞中MHC-I和CD4的Nef介导下调.
- 评估PROTACs对初级外周血液单核细胞 (PBMCs) 的HIV-1复制的影响.
主要成果:
- 开发了PROTAC,成功诱导了NEF和CRBN之间的三元复合体的形成.
- 由PROTACs调解的Nef被证明是有效的无处不在和蛋白质分解.
- 表明神经导向的PROTACs有效地挽救了T细胞中神经介导的MHC-I和CD4降低调节.
- 在用NEF导向的PROTACs治疗的供体PBMC中,确认了HIV-1复制的抑制.
结论:
- 通过PROTACs向蛋白质降解是中和HIV-1 Nef功能的一种可行的策略.
- 通过PROTACs降解神经,有可能恢复对HIV-1的适应性免疫反应.
- 这种方法可能通过向病毒持久性机制来提供一种新的治疗途径来管理HIV-1感染.
相关概念视频
Retrovirus Life Cycles
46.1K
Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the...
46.1K
Immune Response Against Viral Pathogens
824
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...
824
Retroviruses
12.4K
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’...
12.4K
Cytotoxic T Cells-mediated Immune Response
963
Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
963


