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Quantitative Measurement of Rate of Targeted Protein Degradation

降级(电信) 蛋白质降解 计算生物学 化学 生物 生物化学 计算机科学 电信
作者
Thomas L. Lynch,Violeta L. Marin,Ryan A. McClure,Colin Phipps,J.A. Ronau,Milad Rouhimoghadam,Ashley M. Adams,Soumya Kandi,Malerie L. Wolke,Andrea G. Shergalis,Gregory K. Potts,Omprakash Nacham,Paul L. Richardson,Stephan J. Kakavas,G. Chhor,Gary J. Jenkins,Kevin R. Woller,Scott E. Warder,Anil Vasudevan,Justin M. Reitsma
出处
期刊:ACS Chemical Biology [American Chemical Society]
卷期号:19 (7): 1604-1615 被引量:7
标识
DOI:10.1021/acschembio.4c00262
摘要

Targeted protein degradation (TPD) is a therapeutic approach that leverages the cell's natural machinery to degrade targets instead of inhibiting them. This is accomplished by using mono- or bifunctional small molecules designed to induce the proximity of target proteins and E3 ubiquitin ligases, leading to ubiquitination and subsequent proteasome-dependent degradation of the target. One of the most significant attributes of the TPD approach is its proposed catalytic mechanism of action, which permits substoichiometric exposure to achieve the desired pharmacological effects. However, apart from one in vitro study, studies supporting the catalytic mechanism of degraders are largely inferred based on potency. A more comprehensive understanding of the degrader catalytic mechanism of action can help aspects of compound development. To address this knowledge gap, we developed a workflow for the quantitative measurement of the catalytic rate of degraders in cells. Comparing a selective and promiscuous BTK degrader, we demonstrate that both compounds function as efficient catalysts of BTK degradation, with the promiscuous degrader exhibiting faster rates due to its ability to induce more favorable ternary complexes. By leveraging computational modeling, we show that the catalytic rate is highly dynamic as the target is depleted from cells. Further investigation of the promiscuous kinase degrader revealed that the catalytic rate is a better predictor of optimal degrader activity toward a specific target compared to degradation magnitude alone. In summary, we present a versatile method for mapping the catalytic activity of any degrader for TPD in cells.
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