Primary Citation of Related Structures: 7YJ4, 7YK6, 7YK7
PubMed Abstract:
Members of the insulin superfamily regulate pleiotropic biological processes through two types of target-specific but structurally conserved peptides, insulin/insulin-like growth factors and relaxin/insulin-like peptides. The latter bind to the human relaxin family peptide receptors (RXFPs). Here, we report three cryo-electron microscopy structures of RXFP4-G i protein complexes in the presence of the endogenous ligand insulin-like peptide 5 (INSL5) or one of the two small molecule agonists, compound 4 and DC591053. The B chain of INSL5 adopts a single α-helix that penetrates into the orthosteric pocket, while the A chain sits above the orthosteric pocket, revealing a peptide-binding mode previously unknown. Together with mutagenesis and functional analyses, the key determinants responsible for the peptidomimetic agonism and subtype selectivity were identified. Our findings not only provide insights into ligand recognition and subtype selectivity among class A G protein-coupled receptors, but also expand the knowledge of signaling mechanisms in the insulin superfamily.
Organizational Affiliation:
Department of Pharmacology, School of Basic Medical Sciences, Fudan University, Shanghai, 200032, China.
State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203, China.
Lingang Laboratory, Shanghai, 200031, China.
School of Pharmaceutical Science and Technology, Hangzhou Institute for Advanced Study, UCAS, Hangzhou, 310024, China.
The CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203, China.
The National Center for Drug Screening, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
Research Center for Deepsea Bioresources, Sanya, Hainan, 572025, China.
The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Parkville, Victoria, 3052, Australia.
Department of Biochemistry and Molecular Biology, University of Melbourne, Parkville, Victoria, 3052, Australia.
School of Life Science and Technology, ShanghaiTech University, Shanghai, 201210, China.
The CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203, China. dhyang@simm.ac.cn.
The National Center for Drug Screening, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203, China. dhyang@simm.ac.cn.
University of Chinese Academy of Sciences, Beijing, 100049, China. dhyang@simm.ac.cn.
Research Center for Deepsea Bioresources, Sanya, Hainan, 572025, China. dhyang@simm.ac.cn.
State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203, China. hliu@simm.ac.cn.
School of Pharmaceutical Science and Technology, Hangzhou Institute for Advanced Study, UCAS, Hangzhou, 310024, China. hliu@simm.ac.cn.
University of Chinese Academy of Sciences, Beijing, 100049, China. hliu@simm.ac.cn.
School of Life Science and Technology, ShanghaiTech University, Shanghai, 201210, China. hliu@simm.ac.cn.
Department of Pharmacology, School of Basic Medical Sciences, Fudan University, Shanghai, 200032, China. mwwang@simm.ac.cn.
The CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203, China. mwwang@simm.ac.cn.
The National Center for Drug Screening, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, 201203, China. mwwang@simm.ac.cn.
University of Chinese Academy of Sciences, Beijing, 100049, China. mwwang@simm.ac.cn.
Research Center for Deepsea Bioresources, Sanya, Hainan, 572025, China. mwwang@simm.ac.cn.
Department of Chemistry, School of Science, The University of Tokyo, Tokyo, 113-0033, Japan. mwwang@simm.ac.cn.
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