Tethered agonist exposure in intact adhesion/class B2 GPCRs through intrinsic structural flexibility of the GAIN domain

• DOI: 10.1016/j.molcel.2020.12.042
• Publication Date: 2021-01-25T15:40:31Z
• Authors: Gerti Beliu; Steffen Altrichter; Ramon Guixà-González; Mareike Hemberger; Ina Brauer; Anne-Kristin Dahse; Nicole Scholz; Robert Wieduwild; Alexander Kuhlemann; Hossein Batebi; Florian Seufert; Guillermo Pérez-H...; Peter W. Hildebrand; Markus Sauer; Tobias Langenhan
• Keywords: Protein Conformation, alpha-Helical; 0301 basic medicine; Binding Sites; Gene Expression; Nerve Tissue Proteins; Molecular Dynamics Simulation; Crystallography, X-Ray; Receptors, G-Protein-Coupled; 03 medical and health sciences; HEK293 Cells; Antigens, CD; COS Cells; Chlorocebus aethiops; Proteolysis; Animals; Humans; Protein Conformation, beta-Strand; Protein Interaction Domains and Motifs; Amino Acid Sequence; Protein Multimerization; Peptides; Protein Binding

Adhesion G protein-coupled receptors (aGPCRs)/family B2 GPCRs execute critical tasks during development and the operation of organs, and their genetic lesions are associated with human disorders, including cancers. Exceptional structural aGPCR features are the presence of a tethered agonist (TA) concealed within a GPCR autoproteolysis-inducing (GAIN) domain and their non-covalent heteromeric two-subunit layout. How the TA is poised for activation while maintaining this delicate receptor architecture is central to conflicting signaling paradigms that either involve or exclude aGPCR heterodimer separation. We investigated this matter in five mammalian aGPCR homologs (ADGRB3, ADGRE2, ADGRE5, ADGRG1, and ADGRL1) and demonstrate that intact aGPCR heterodimers exist at the cell surface, that the core TA region becomes unmasked in the cleaved GAIN domain, and that intra-GAIN domain movements regulate the level of tethered agonist exposure, thereby likely controlling aGPCR activity. Collectively, these findings delineate a unifying mechanism for TA-dependent signaling of intact aGPCRs.