对蛋白质辅助剂相互作用的热力学研究,涉及不同等级的聚酸盐20和80
Joseph Whiteley1, Laura J Waters1, James Humphrey2
1School of Applied Sciences, University of Huddersfield, Queensgate, Huddersfield HD1 3DH UK.
概括
聚酸盐等级 (20和80) 影响生物制药配方的稳定性,通过影响与模型蛋白 (如β-乳糖球蛋白和人血清白蛋白) 的相互作用,而不是免疫球蛋白G.
科学领域:
- 生物制药配方 生物制药配方
- 蛋白质稳定 蛋白质稳定
- 表面活性剂化学 表面活性剂化学
背景情况:
- 稳定的生物制药配方对于药物的有效性和保质期至关重要.
- 表面活性剂,如聚酸盐20和80通常用于增强配方稳定性.
- 表面活性剂等级对蛋白质-表面活性剂相互作用和随后的配方稳定性的影响仍然未得到充分研究.
研究的目的:
- 为了研究常规与超精炼TM等级的聚酸盐20和80对蛋白质稳定性的影响.
- 评估不同聚酸盐等级和模型蛋白质之间的相互作用热力学:β-乳糖球蛋白 (β-Ig),人血清白蛋白 (HSA) 和免疫球蛋白G (IgG).
- 阐明聚酸盐在稳定生物制药配方中的作用.
主要方法:
- 异热定位热量计 (ITC) 用于研究结合相互作用和热力学.
- 差分扫描热量计 (DSC) 用于测量在表面活性剂的存在下蛋白质展开温度.
- 模型蛋白 (β-Ig,HSA,IgG) 用常规和超精炼TM等级的聚酸盐20和80进行化.
主要成果:
- 这四种多酸盐都与β-Ig和HSA相互作用,但与IgG不相互作用,可能是由于蛋白质二级结构的差异.
- 结合比和解离常数在β-Ig和HSA之间有所不同,HSA表现出更强的结合相互作用.
- 在聚酸盐的存在下,DSC证实了β-Ig和HSA的增强蛋白质稳定性 (展开温度增加46K),表明稳定性有所改善.
结论:
- 聚酸盐的等级可以影响其与生物制药配方中的特定蛋白质的相互作用.
- 聚酸盐对β-Ig和HSA表现出稳定作用,热力学特征是结合相互作用和增加展开温度.
- 与IgG缺乏相互作用表明蛋白质结构是聚酸盐结合和稳定功效的关键决定因素.
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