Progress in correlation spectroscopy at ultra-fast magic-angle spinning: Basic building blocks and complex experiments for the study of protein structure and dynamics

► Recent progress in solid-state NMR at high static magnetic fields and ultra-fast MAS is discussed. ► A focus is on protein resonance assignment and structure determination. ► Consequences of ultra-fast MAS on sensitivity and sample heating are considered. ► Recoupling and decoupling techniques are presented. ► We discuss new research avenues: paramagnetic doping and proton detection.