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1.中山大学附属第七医院,广东 深圳 518107
2.中国科学院广州生物医药与健康研究院,广东 广州 510530
Received:21 January 2025,
Revised:2025-05-04,
Accepted:09 June 2025,
Published Online:16 July 2025,
Published:25 September 2025
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刘旋,范恒新,周宁坤等.GPR158四聚体结构初步解析[J].中山大学学报(自然科学版)(中英文),2025,64(05):1-10.
LIU Xuan,FAN Hengxin,ZHOU Ningkun,et al.Preliminary structure determination of GPR158 tetramer[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2025,64(05):1-10.
刘旋,范恒新,周宁坤等.GPR158四聚体结构初步解析[J].中山大学学报(自然科学版)(中英文),2025,64(05):1-10. DOI: 10.13471/j.cnki.acta.snus.ZR20250017.
LIU Xuan,FAN Hengxin,ZHOU Ningkun,et al.Preliminary structure determination of GPR158 tetramer[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2025,64(05):1-10. DOI: 10.13471/j.cnki.acta.snus.ZR20250017.
作为C家族GPCR的一员,GPR158近年来因其在神经传递及情绪调控中的独特作用而备受关注。GPR158与RGS7-Gβ5复合物的相互作用在抑郁症等神经精神疾病的病理过程中展现出潜在的重要价值。为更好地了解GPR158与RGS7-Gβ5是如何相互作用的,本研究利用昆虫细胞表达系统,共表达并纯化出GPR158-RGS7-Gβ5复合物,对其进行冷冻电镜结构研究。在结构解析过程中,发现部分GPR158以同源四聚体的方式与RGS7-Gβ5相结合。由于RGS7和Gβ5电子密度的缺失,最终获得了1个分辨率为0.422 nm的GPR158同源四聚体结构。该结构显示,GPR158是以二聚体肩并肩的方式形成四聚体。同时,该结构是首个被解析的GPCR四聚体结构,为后续GPCR寡聚体的结构研究奠定了基础。
GPR158, a member of class C GPCRs, has attracted much attention for its unique roles in neurotransmission and emotion regulation recently. The interaction between GPR158 and RGS7-Gβ5 complex has shown potential values in the pathological process of neuropsychiatric diseases such as depression. To better understand how GPR158 interacts with RGS 7-Gβ5, in the study, we coexpressed the GPR158-RGS 7-Gβ5 complex by using baculovirus expression system,and then purified for Cryo-EM sample preparation. During data processing, some GPR158 were found to form homotetramers and interacted with RGS7-Gβ5 unexpectedly, and a GPR158 homotetramer structure with a resolution of 0.422 nm was finally obtained. The structure shows that two pairs of GPR158 dimers are arranged side by side. Meanwhile, the structure of GPR158 tetramer, as the first one to be resolved in GPCR family, lays the foundation for subsequent structural research of GPCR oligomers.
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