Jonas Düring, Madita Wolter, Julia J Toplak, Camilo Torres, Olexandr Dybkov, Thornton J Fokkens, Katherine E Bohnsack, Henning Urlaub, Wieland Steinchen, Christian Dienemann, Sonja Lorenz
Ubiquitin ligases (E3s) are pivotal specificity determinants in the ubiquitin system by selecting substrates and decorating them with distinct ubiquitin signals. However, structure determination of the underlying, specific E3-substrate complexes has proven challenging owing to their transient nature. In particular, it is incompletely understood how members of the catalytic cysteine-driven class of HECT-type ligases (HECTs) position substrate proteins for modification. Here, we report a cryogenic electron microscopy (cryo-EM) structure of the full-length human HECT HACE1, along with solution-based conformational analyses by small-angle X-ray scattering and hydrogen-deuterium exchange mass spectrometry...
February 8, 2024: Nature Structural & Molecular Biology