通过增强Bxb1血清整合酶的核定位,提高了CHO细胞的稳定整合效率
Olli Huhtinen1,2, Stuart Prince3,4, Urpo Lamminmäki5
1Protein & Antibody Engineering, Orion Corporation, Turku, Finland. olanhu@utu.fi.
BMC biotechnology
|June 26, 2024
概括
用核定位信号 (NLS) 和RanGAP提高Bxb1整合酶的效率,显著提高了哺乳动物显示库的稳定基因组整合. 这种方法将整合效率提高了14倍以上,使得更大的抗体开发库成为可能.
科学领域:
- 生物技术是生物技术.
- 分子生物学分子生物学
- 基因组工程是基因组工程.
背景情况:
- 哺乳动物显示对于治疗性抗体的发展至关重要,它提供了像全长IgG显示和适当的糖化等优势.
- 哺乳动物显示的挑战包括有限的图书馆大小和大量的培养体积,阻碍了可扩展性.
- Bxb1血清整合酶促进了抗体基因的稳定基因组整合,但需要提高大型图书馆的效率.
研究的目的:
- 为了提高 Bxb1 血清酶整合酶介导的稳定基因组整合的效率.
- 调查影响Bxb1集成核定位和集成效率的因素.
- 通过改进基因整合,使得大型哺乳动物展示库的建设成为可能.
主要方法:
- 它将各种核定位信号 (NLS) 融合到Bxb1整合酶的N和C末端.
- 同表达的核运输蛋白,包括Ran GTPase激活蛋白 (RanGAP).
- 评估了GFP和抗体显示卡塞特在CHO细胞基因组中的整合效率.
主要成果:
- C端核胺NLS融合到Bxb1整合酶的整合效率提高了6倍以上.
- 两个C端核胺NLS融合的副本进一步提高了131%的效率.
- RanGAP的共同表达和优化的NLS融合导致抗体基因集成的集成效率提高了14倍以上.
结论:
- 为Bxb1整合酶优化NLS序列融合显著提高了稳定的基因组整合效率.
- 这种优化的方法为在哺乳动物细胞中构建更大的基因库提供了实用方法.
- 这些发现有助于开发更大,更多样化的抗体库,用于治疗应用.
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