Journal: Sci Adv / Year: 2021 Title: Structural basis of the activation of the CC chemokine receptor 5 by a chemokine agonist. Authors: Polina Isaikina / Ching-Ju Tsai / Nikolaus Dietz / Filip Pamula / Anne Grahl / Kenneth N Goldie / Ramon Guixà-González / Camila Branco / Marianne Paolini-Bertrand / Nicolas Calo / Fabrice ...Authors: Polina Isaikina / Ching-Ju Tsai / Nikolaus Dietz / Filip Pamula / Anne Grahl / Kenneth N Goldie / Ramon Guixà-González / Camila Branco / Marianne Paolini-Bertrand / Nicolas Calo / Fabrice Cerini / Gebhard F X Schertler / Oliver Hartley / Henning Stahlberg / Timm Maier / Xavier Deupi / Stephan Grzesiek / Abstract: The human CC chemokine receptor 5 (CCR5) is a G protein-coupled receptor (GPCR) that plays a major role in inflammation and is involved in cancer, HIV, and COVID-19. Despite its importance as a drug ...The human CC chemokine receptor 5 (CCR5) is a G protein-coupled receptor (GPCR) that plays a major role in inflammation and is involved in cancer, HIV, and COVID-19. Despite its importance as a drug target, the molecular activation mechanism of CCR5, i.e., how chemokine agonists transduce the activation signal through the receptor, is yet unknown. Here, we report the cryo-EM structure of wild-type CCR5 in an active conformation bound to the chemokine super-agonist [6P4]CCL5 and the heterotrimeric G protein. The structure provides the rationale for the sequence-activity relation of agonist and antagonist chemokines. The N terminus of agonist chemokines pushes onto specific structural motifs at the bottom of the orthosteric pocket that activate the canonical GPCR microswitch network. This activation mechanism differs substantially from other CC chemokine receptors that bind chemokines with shorter N termini in a shallow binding mode involving unique sequence signatures and a specialized activation mechanism.
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Apr 13, 2021
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Jun 30, 2021
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Mar 16, 2022
Processing site: PDBe / Status: Released
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