将HIV-1 V3循环陷入螺旋形状中,可以实现广泛的中和
Matthias Glögl1, Nikolas Friedrich1, Gabriele Cerutti2
1Institute for Medical Virology, University of Zurich (UZH), Zurich, Switzerland.
Nature structural & molecular biology
|August 21, 2023
概括
新的抑制剂在CD4附着后向人体免疫缺陷病毒1 (HIV-1) 的V3循环. 这些设计的安基林重复蛋白 (DARPin) 抑制剂表现出广泛的中和性,提供了一种针对HIV-1的新策略.
科学领域:
- 病毒学 病毒学
- 免疫学 免疫学 免疫学
- 结构生物学 结构生物学
背景情况:
- 艾滋病毒-1包膜糖蛋白的V3循环对于病毒进入至关重要.
- 目前,广泛中和抗体通常针对预注液缩剂上的保存表位,但V3循环的可访问性有限.
- 在CD4结合后,在开放的trimers上准V3循环的抗体较少见,但非常受欢迎.
研究的目的:
- 开发新的V3循环特异性抑制剂,针对HIV-1的CD4结合状态.
- 描述这些新兴抑制剂的结合部位和中和机制.
- 探索HIV-1治疗的附着后抑制策略的潜力.
主要方法:
- 设计的安基林重复蛋白 (DARPin) 技术被用来制造V3特异性抑制剂.
- 进行了结合性测试,以确定DARPins与开放的HIV-1包膜剪切器的相互作用.
- 用分子动力学模拟和逃生突变分析来了解目标表位的功能相关性.
主要成果:
- 一个不同的类别的V3特异性DARPins表现出广泛的中和宽度 (>90%) 对HIV-1.
- 这些广泛中和的DARPins (bnDs) 特别识别了开封面修剪器的V3循环中的α-螺旋区域 (αV3C).
- 发现αV3C表位是高度保守的,与CD4结合部位相当.
结论:
- 设计的安基林重复蛋白向V3循环的αV3C区域,是HIV-1抑制剂的一个有前途的新类.
- 这些抑制剂有效地向病毒的附着后,CD4结合状态,克服当前抗体疗法的局限性.
- 这些发现强调了基于αV3C的抑制剂和附着后抑制策略的潜力,以开发有效的HIV-1治疗方法.
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