Protein Dynamics at the Heart of Chaperone Function: Insights from Solution NMR

Molecular chaperones are essential guardians of cellular proteostasis, facilitating the folding, remodeling, and triage of a wide array of protein clients under fluctuating physiological conditions. While traditional structural approaches have provided invaluable static snapshots, recent advances in solution NMR spectroscopy have revealed that conformational dynamics-across a broad spectrum of timescales-lie at the heart of chaperone function. In this review, we discuss how state-of-the-art NMR techniques have transformed our understanding of chaperone-client and chaperone-chaperone interactions, uncovering dynamic ensembles, transient intermediates, and allosteric regulatory switches that drive substrate recognition and processing. By focusing on representative systems-including Hsp90, Hsp40-Hsp70, GroEL, and Sgt2-we illustrate how protein dynamics confer both selectivity and adaptability, enabling chaperones to manage diverse clients and respond to cellular challenges. We conclude by outlining key open questions and highlighting the continued promise of NMR and integrative approaches for unraveling the complex, dynamic choreography of protein homeostasis.