Structural Basis of Substrate Recognition by the Membrane-Associated E3 Ubiquitin Ligases

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Membrane-associated E3 ubiquitin ligases control cellular levels of important immunoregulatory molecules and occur in both host- and virus-encoded forms. Target selectivity maps to the transmembrane domains of ligases and their substrates in a little-studied mode of intramembrane molecular recognition. Our goal is to determine the physical basis of this interaction by establishing which sequences drive the association and providing atomic-resolution structures of the membrane-embedded complexes.