Recent advances in solid-state nuclear magnetic resonance studies on membrane fusion proteins.

Membrane fusion is an essential biological process that merges two separate lipid bilayers into a whole one. Membrane fusion proteins facilitate this process by bringing lipid bilayers in close proximity to reduce the repulsive energy between membranes. Along with their interactions with membranes, the structures and dynamics of membrane fusion proteins are key to elucidating the mechanisms of membrane fusion. Solid-state NMR (SSNMR) spectroscopy has unique advantages in determining the structures and dynamics of membrane fusion proteins in their membrane-bound states. It has been extensively applied to reveal conformational changes in intermediate states of viral membrane fusion proteins and to characterize the critical lipid-membrane interactions that drive the fusion process. In this review, we summarize recent advancements in SSNMR techniques for studying membrane fusion proteins and their applications in elucidating the mechanisms of membrane fusion.