Assessing site-specific PEGylation of TEM-1 β-lactamase with cell-free protein synthesis and coarse-grained simulation

聚乙二醇化 化学 蛋白质工程 PEG比率 组合化学 生物物理学 计算机科学 生物系统 聚乙二醇 生物化学 生物 财务 经济
作者
Emily Zhao,Mehran Soltani,Addison K. Smith,J. Porter Hunt,Thomas A. Knotts,Bradley C. Bundy
出处
期刊:Journal of Biotechnology [Elsevier BV]
卷期号:345: 55-63 被引量:4
标识
DOI:10.1016/j.jbiotec.2021.12.016
摘要

PEGylation is a broadly used strategy to enhance the pharmacokinetic properties of therapeutic proteins. It is well established that the location and extent of PEGylation have a significant impact on protein properties. However, conventional PEGylation techniques have limited control over PEGylation sites. Emerging site-specific PEGylation technology provides control of PEG placement by conjugating PEG polymers via click chemistry reaction to genetically encoded non-canonical amino acids. Unfortunately, a method to rapidly determine the optimal PEGylation location has yet to be established. Here we seek to address this challenge. In this work, coarse-grained molecular dynamic simulations are paired with high-throughput experimental screening utilizing cell-free protein synthesis to investigate the effect of site-specific PEGylation on the two-state folder protein TEM-1 β-lactamase. Specifically, the conjugation efficiency, thermal stability, and enzymatic activity are studied for the enzyme PEGylated at several different locations. The results of this analysis confirm that the physical properties of the PEGylated protein vary considerably with PEGylation site and that traditional design recommendations are insufficient to predict favorable PEGylation sites. In this study, the best predictor of the most favorable conjugation site is coarse-grained simulation. Thus, we propose a dual combinatorial screening approach in which coarse-grained molecular simulation informs site selection for high-throughput experimental verification.
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