Rapid Characterization of Structural and Behavioral Changes of Therapeutic Proteins by Relaxation and Diffusion 1H-SOFAST NMR Experiments

08 August 2024, Version 1
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

Biologic drugs have emerged as a rapidly expanding and important modality, offering promising therapeutic solutions by interacting with previously 'undruggable' targets, thus significantly expanding the range of modern pharmaceutical applications. However, the inherent complexity of these drugs also introduces liabilities and poses challenges in their development, necessitates efficient screening methods to evaluate the structural stability and behavior. Although NMR spectroscopy is well-suited for detecting weak interactions, changes in dynamics, high-order structure, and association states of macromolecules in fully formulated samples, the inherent low sensitivity limits its utility as a fast screening and characterization tool. In this study, we present two fast pulsing NMR experiments, namely the SOFAIR (band-Selective Optimized Flip-Angle Internally-encoded Relaxation) and the SOFIT (band-Selective Optimized Flip-angle Internally-encoded Translational diffusion), which enable rapid and reliable measurements of transverse relaxation rates and diffusion coefficients with more than 10-fold higher sensitivity compared to commonly used methods, like CPMG (Carr-Purcell-Meiboom-Gill) and DOSY (Diffusion-Ordered Spectroscopy), allowing the rapid assessment of biologics even at low concentrations. We demonstrated the effectiveness and versatility of these experiments by evaluating several examples, including thermally stressed proteins, proteins at different concentrations, and a therapeutic protein in various formulations. We anticipate that these novel approaches will greatly facilitate the analysis and characterization of biologics during drug discovery.

Keywords

Nuclear Magnetic Resonance
Biologics discovery
Biologics characterization

Supplementary materials

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Supplementary Information
Description
SI contains pulse sequences details, supplementary tables S1 – S3 summarizing R2 and D values shown in figures 2 – 4 and described in the main text, supplementary figures S1 – S5 for control experiments
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