8sg9
CCT G beta 5 complex closed state 3
Structural highlights
DiseaseGNB5_HUMAN GNB5-related intellectual disability-cardiac arrhythmia syndrome. The disease is caused by variants affecting the gene represented in this entry. The disease is caused by variants affecting the gene represented in this entry. FunctionGNB5_HUMAN Enhances GTPase-activating protein (GAP) activity of regulator of G protein signaling (RGS) proteins, such as RGS7 and RGS9, hence involved in the termination of the signaling initiated by the G protein coupled receptors (GPCRs) by accelerating the GTP hydrolysis on the G-alpha subunits, thereby promoting their inactivation (PubMed:27677260). Increases RGS7 GTPase-activating protein (GAP) activity, thereby regulating mood and cognition (By similarity). Increases RGS9 GTPase-activating protein (GAP) activity, hence contributes to the deactivation of G protein signaling initiated by D(2) dopamine receptors (PubMed:27677260). May play an important role in neuronal signaling, including in the parasympathetic, but not sympathetic, control of heart rate (By similarity).[UniProtKB:A1L271][UniProtKB:P62881][1] Publication Abstract from PubMedThe Chaperonin Containing Tailless polypeptide 1 (CCT) complex is an essential protein folding machine with a diverse clientele of substrates, including many proteins with beta-propeller domains. Here, we determine the structures of human CCT in complex with its accessory co-chaperone, phosducin-like protein 1 (PhLP1), in the process of folding Gbeta(5), a component of Regulator of G protein Signaling (RGS) complexes. Cryoelectron microscopy (cryo-EM) and image processing reveal an ensemble of distinct snapshots that represent the folding trajectory of Gbeta(5) from an unfolded molten globule to a fully folded beta-propeller. These structures reveal the mechanism by which CCT directs Gbeta(5) folding through initiating specific intermolecular contacts that facilitate the sequential folding of individual beta sheets until the propeller closes into its native structure. This work directly visualizes chaperone-mediated protein folding and establishes that CCT orchestrates folding by stabilizing intermediates through interactions with surface residues that permit the hydrophobic core to coalesce into its folded state. Visualizing the chaperone-mediated folding trajectory of the G protein beta5 beta-propeller.,Wang S, Sass MI, Kwon Y, Ludlam WG, Smith TM, Carter EJ, Gladden NE, Riggi M, Iwasa JH, Willardson BM, Shen PS Mol Cell. 2023 Nov 2;83(21):3852-3868.e6. doi: 10.1016/j.molcel.2023.09.032. Epub , 2023 Oct 17. PMID:37852256[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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