6MHF
Galphai3 co-crystallized with GIV/Girdin
Summary for 6MHF
| Entry DOI | 10.2210/pdb6mhf/pdb |
| Descriptor | Guanine nucleotide-binding protein G(k) subunit alpha, Girdin, GUANOSINE-5'-DIPHOSPHATE, ... (5 entities in total) |
| Functional Keywords | exchange, modulator, gpcr, inhibitory, signaling protein |
| Biological source | Rattus norvegicus (Rat) More |
| Total number of polymer chains | 2 |
| Total formula weight | 43914.37 |
| Authors | Rees, S.D.,Kalogriopoulos, N.A.,Ngo, T.,Kopcho, N.,Ilatovskiy, A.,Sun, N.,Komives, E.,Chang, G.,Ghosh, P.,Kufareva, I. (deposition date: 2018-09-17, release date: 2019-07-31, Last modification date: 2023-10-11) |
| Primary citation | Kalogriopoulos, N.A.,Rees, S.D.,Ngo, T.,Kopcho, N.J.,Ilatovskiy, A.V.,Sun, N.,Komives, E.A.,Chang, G.,Ghosh, P.,Kufareva, I. Structural basis for GPCR-independent activation of heterotrimeric Gi proteins. Proc.Natl.Acad.Sci.USA, 116:16394-16403, 2019 Cited by PubMed Abstract: Heterotrimeric G proteins are key molecular switches that control cell behavior. The canonical activation of G proteins by agonist-occupied G protein-coupled receptors (GPCRs) has recently been elucidated from the structural perspective. In contrast, the structural basis for GPCR-independent G protein activation by a novel family of guanine-nucleotide exchange modulators (GEMs) remains unknown. Here, we present a 2.0-Å crystal structure of Gαi in complex with the GEM motif of GIV/Girdin. Nucleotide exchange assays, molecular dynamics simulations, and hydrogen-deuterium exchange experiments demonstrate that GEM binding to the conformational switch II causes structural changes that allosterically propagate to the hydrophobic core of the Gαi GTPase domain. Rearrangement of the hydrophobic core appears to be a common mechanism by which GPCRs and GEMs activate G proteins, although with different efficiency. Atomic-level insights presented here will aid structure-based efforts to selectively target the noncanonical G protein activation. PubMed: 31363053DOI: 10.1073/pnas.1906658116 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (2 Å) |
Structure validation
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