8xzg

From Proteopedia

Cryo-EM structure of the [Pyr1]-apelin-13-bound human APLNR-Gi complex

Structural highlights

8xzg is a 5 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	Electron Microscopy, Resolution 3.2Å
Ligands:
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

GNAI1_HUMAN Guanine nucleotide-binding proteins (G proteins) are involved as modulators or transducers in various transmembrane signaling systems. The G(i) proteins are involved in hormonal regulation of adenylate cyclase: they inhibit the cyclase in response to beta-adrenergic stimuli. The inactive GDP-bound form prevents the association of RGS14 with centrosomes and is required for the translocation of RGS14 from the cytoplasm to the plasma membrane. May play a role in cell division.^[1] ^[2]

Publication Abstract from PubMed

Apelin is a key hormone in cardiovascular homeostasis that activates the apelin receptor (APLNR), which is regarded as a promising therapeutic target for cardiovascular disease. However, adverse effects through the beta-arrestin pathway limit its pharmacological use. Here, we report cryoelectron microscopy (cryo-EM) structures of APLNR-G(i1) complexes bound to three agonists with divergent signaling profiles. Combined with functional assays, we have identified "twin hotspots" in APLNR as key determinants for signaling bias, guiding the rational design of two exclusive G-protein-biased agonists WN353 and WN561. Cryo-EM structures of WN353- and WN561-stimulated APLNR-G protein complexes further confirm that the designed ligands adopt the desired poses. Pathophysiological experiments have provided evidence that WN561 demonstrates superior therapeutic effects against cardiac hypertrophy and reduced adverse effects compared with the established APLNR agonists. In summary, our designed APLNR modulator may facilitate the development of next-generation cardiovascular medications.

Structure-based design of non-hypertrophic apelin receptor modulator.,Wang WW, Ji SY, Zhang W, Zhang J, Cai C, Hu R, Zang SK, Miao L, Xu H, Chen LN, Yang Z, Guo J, Qin J, Shen DD, Liang P, Zhang Y, Zhang Y Cell. 2024 Mar 14;187(6):1460-1475.e20. doi: 10.1016/j.cell.2024.02.004. Epub , 2024 Feb 29. PMID:38428423^[3]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Cho H, Kehrl JH. Localization of Gi alpha proteins in the centrosomes and at the midbody: implication for their role in cell division. J Cell Biol. 2007 Jul 16;178(2):245-55. PMID:17635935 doi:10.1083/jcb.200604114
↑ Johnston CA, Siderovski DP. Structural basis for nucleotide exchange on G alpha i subunits and receptor coupling specificity. Proc Natl Acad Sci U S A. 2007 Feb 6;104(6):2001-6. Epub 2007 Jan 30. PMID:17264214
↑ Wang WW, Ji SY, Zhang W, Zhang J, Cai C, Hu R, Zang SK, Miao L, Xu H, Chen LN, Yang Z, Guo J, Qin J, Shen DD, Liang P, Zhang Y, Zhang Y. Structure-based design of non-hypertrophic apelin receptor modulator. Cell. 2024 Mar 14;187(6):1460-1475.e20. PMID:38428423 doi:10.1016/j.cell.2024.02.004