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-Structure paper
タイトル | Structural basis of oligomerization-modulated activation and autoinhibition of orphan receptor GPR3. |
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ジャーナル・号・ページ | Cell Rep, Vol. 44, Issue 4, Page 115478, Year 2025 |
掲載日 | 2025年3月28日 |
![]() | Hao Chang / Xiaoting Li / Hongqing Tu / Lijie Wu / Yanan Yu / Junlin Liu / Na Chen / Wei L Shen / Tian Hua / ![]() |
PubMed 要旨 | G protein-coupled receptor 3 (GPR3) is a class A orphan receptor characterized by high constitutive activity in the G signaling pathway. GPR3 has been implicated in Alzheimer's disease and the ...G protein-coupled receptor 3 (GPR3) is a class A orphan receptor characterized by high constitutive activity in the G signaling pathway. GPR3 has been implicated in Alzheimer's disease and the regulation of thermogenesis in human adipocytes, yet the molecular mechanisms underlying its self-activation and potential endogenous modulators remain unclear. In this study, we present cryo-electron microscopy (cryo-EM) structures of GPR3 in different oligomerization states, both in the absence and presence of G protein. Notably, in addition to the monomeric form of GPR3, our findings reveal a functional GPR3 dimer with an extensive dimer interface-a feature rarely observed in class A GPCRs. Moreover, oligomerization appears to be linked to a unique autoinhibition mechanism involving intracellular loops, which may regulate GPR3 signaling. Collectively, these results provide new insights into the oligomerization-modulated activation of orphan GPCRs, advancing our understanding of their signaling properties. |
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手法 | EM (単粒子) |
解像度 | 3.06 - 3.66 Å |
構造データ | ![]() PDB-9lyb: ![]() PDB-9lyc: ![]() PDB-9lyd: |
由来 |
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![]() | STRUCTURAL PROTEIN / GPCR / G protein / cryo-EM / membrane protein |