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针对抗体的面向固定使用酶介导的特定部位生物化来增强抗原结合能力

Emily Beitello¹, Kwame Osei¹, Trent Kobulnicky¹

¹Department of Chemistry, Illinois State University, Normal, Illinois 61790, United States.

Langmuir : the ACS journal of surfaces and colloids

|April 20, 2025

概括

一种新的酶介导方法使抗体的特定部位生物化成为可能,改善了它们在表面上的定向. 这一策略通过增加抗原结合能力和灵敏度来提高生物传感器性能.

科学领域:

生物结合化学生物结合化学
生物传感器技术技术
酶催化酶的催化作用

背景情况:

表面固定抗体的有效性通常受到随机定向和稳定性降低的限制.
这会影响生物传感器的分析性能,阻碍敏感检测.
开发面向抗体固定化的方法对于推进生物传感器应用至关重要.

研究的目的:

开发一种新的酶介导策略,用于抗体的特定部位生物化.
为了使抗体的定向固定在斯特雷普塔维丁功能化的表面上.
评估特定部位固定对抗体生物传感器性能的影响.

主要方法:

利用微生物转质胺酶 (mTG) 来对使用NH2-PEG4-生物的抗白过氧化酶 (anti-HRP) 抗体的Fc区域进行特定部位的生物化.
将mTG介导的生物化与使用NHS-PEG4-生物素向氨酸残留物的随机生物化进行比较.
通过西部斑点分析,在链丁涂层板上固定特定和随机生物化抗体,并通过评估抗原 (HRP) 结合能力,灵敏度和检测极限.

主要成果:

mTG介导的生物化专门针对重链的Fc区域,与重链和轻链发生的随机生物化不同.
与随机生物化抗体 (5.0 ± 0.6) 相比,特定部位的生物化抗体表现出较低的生物与抗体比率 (1.9 ± 0.3).
对特定部位的生物化抗体的固定导致抗原结合能力,灵敏度和检测极限提高了3倍.

结论:

化学酶策略提供了特定位点的生物化,用于在没有蛋白质工程的情况下定向抗体固定.
通过Fc区域不动化进行适当的抗体定向,可显著提高生物传感器分析性能.
这种普遍适用的方法为开发高性能抗体基生物传感器提供了强大的方法.

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