9k1d
Cryo-EM structure of the butyrate bound FFA2-Gi complex
Structural highlights
FunctionGBG2_HUMAN Guanine nucleotide-binding proteins (G proteins) are involved as a modulator or transducer in various transmembrane signaling systems. The beta and gamma chains are required for the GTPase activity, for replacement of GDP by GTP, and for G protein-effector interaction (By similarity). Publication Abstract from PubMedFree fatty acid receptors (FFARs) play critical roles in metabolic regulation and are potential therapeutic targets for metabolic and inflammatory diseases. A comprehensive understanding of the activation mechanisms and endogenous ligand selectivity of FFARs is essential for drug discovery. Here, we report two cryoelectron microscopy structures of the human FFAR1 bound to the endogenous ligand docosahexaenoic acid (DHA) and G(i1) protein as well as FFAR2 in complex with butyrate and G(i1) at 3.2 A and 3.3 A resolution, respectively. These structures highlight that distinct locations and sizes of the orthosteric ligand binding pockets are crucial determinants of the endogenous ligand selectivity of this receptor subfamily. Additionally, computational analysis reveals a potential allosteric ligand binding pocket in FFAR2. Furthermore, we observe that the upward movement of helix V upon endogenous ligand binding is responsible for receptor activation. These insights will significantly aid in the development of drugs targeting this receptor family. Structural insights into endogenous ligand selectivity and activation mechanisms of FFAR1 and FFAR2.,Ke Y, Huang Y, Yi C, Ma L, Chu X, Wu B, Zhao Q, Han S Cell Rep. 2024 Nov 30;43(12):115024. doi: 10.1016/j.celrep.2024.115024. PMID:39616615[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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