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Analysis of the Structure of 14 Therapeutic Antibodies Using Circular Dichroism Spectroscopy
Analytical Chemistry ( IF 6.7 ) Pub Date : 2024-09-10 , DOI: 10.1021/acs.analchem.4c01882
Maria G Bruque 1, 2 , Alison Rodger 3 , Søren Vrønning Hoffmann 4 , Nykola C Jones 4 , Jean Aucamp 5 , Tim R Dafforn 2 , Owen R T Thomas 1
Affiliation  

Understanding the impact of the manufacturing environment on therapeutic monoclonal antibody (mAb) structures requires new process analytical technology. Here, we describe the creation of a new reference set for the circular dichroism (CD) spectra of mAbs. Data sets of the highest quality were collected by synchrotron radiation CD for 14 different mAbs in both native and acid-stressed states. Deconvolution of far-UV spectra for the mAb cohort identified two current reference sets (SP175 and SMP180) as assigning accurate secondary structures, irrespective of the analysis program employed. Scrutiny of spectra revealed significant variation in the far-UV and especially near-UV CD of the 14 mAbs. Two spectral features were found to be sensitive to changes in solution pH, i.e., the far-UV positive peak at 201–202 nm and the near-UV negative exciton couplet around 230–240 nm. The latter feature offers attractive possibilities for in-line CD-based monitoring of the mAb structure during manufacture.

中文翻译:


使用圆二色光谱分析 14 种治疗抗体的结构



了解制造环境对治疗性单克隆抗体 (mAb) 结构的影响需要新的工艺分析技术。在这里,我们描述了为 mAb 圆二色性 (CD) 光谱创建新参考集的过程。通过同步辐射 CD 收集了 14 种不同单克隆抗体在天然状态和酸应激状态下的最高质量数据集。 mAb 队列的远紫外光谱解卷积确定了两个当前参考集(SP175 和 SMP180)来指定准确的二级结构,无论采用何种分析程序。光谱检查显示 14 种 mAb 的远紫外尤其是近紫外 CD 存在显着差异。发现两个光谱特征对溶液 pH 值的变化敏感,即 201-202 nm 处的远紫外正峰和 230-240 nm 附近的近紫外负激子对。后一个功能为制造过程中基于 CD 的 mAb 结构在线监测提供了有吸引力的可能性。
更新日期:2024-09-10
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