Abstract
Macroautophagy/autophagy is a highly conserved process for the degradation of cellular components and plays an essential role in cellular homeostasis maintenance. During autophagy, specialized double-membrane vesicles known as autophagosomes are formed and sequester cytoplasmic cargoes and deliver them to lysosomes or vacuoles for breakdown. Central to this process are autophagy-related (ATG) proteins, with the ATG9-the only integral membrane protein in this core machinery-playing a central role in mediating autophagosome formation. Recent years have witnessed the maturation of cryo-electron microscopy (cryo-EM) and single-particle analysis into powerful tools for high-resolution structural determination of protein complexes. These advancements have significantly deepened our understanding of the intricate molecular mechanisms underlying autophagosome biogenesis. In this study, we present a protocol detailing the acquisition of the three-dimensional structure of ATG9 from Arabidopsis thaliana. The structural resolution achieved 7.8Å determined by single-particle cryo-electron microscopy (cryo-EM).
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