7VGZ

MT1-remalteon-Gi complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural basis of the ligand binding and signaling mechanism of melatonin receptors.

Wang, Q.Lu, Q.Guo, Q.Teng, M.Gong, Q.Li, X.Du, Y.Liu, Z.Tao, Y.

(2022) Nat Commun 13: 454-454

  • DOI: https://doi.org/10.1038/s41467-022-28111-3
  • Primary Citation of Related Structures:  
    7VGY, 7VGZ, 7VH0

  • PubMed Abstract: 

    Melatonin receptors (MT 1 and MT 2 in humans) are family A G protein-coupled receptors that respond to the neurohormone melatonin to regulate circadian rhythm and sleep. Numerous efforts have been made to develop drugs targeting melatonin receptors for the treatment of insomnia, circadian rhythm disorder, and cancer. However, designing subtype-selective melatonergic drugs remains challenging. Here, we report the cryo-EM structures of the MT 1 -G i signaling complex with 2-iodomelatonin and ramelteon and the MT 2 -G i signaling complex with ramelteon. These structures, together with the reported functional data, reveal that although MT 1 and MT 2 possess highly similar orthosteric ligand-binding pockets, they also display distinctive features that could be targeted to design subtype-selective drugs. The unique structural motifs in MT 1 and MT 2 mediate structural rearrangements with a particularly wide opening on the cytoplasmic side. G i is engaged in the receptor core shared by MT 1 and MT 2 and presents a conformation deviating from those in other G i complexes. Together, our results provide new clues for designing melatonergic drugs and further insights into understanding the G protein coupling mechanism.


  • Organizational Affiliation

    Department of Clinical Laboratory, The First Affiliated Hospital of USTC, Ministry of Education Key Laboratory for Membraneless Organelles & Cellular Dynamics, Biomedical Sciences and Health Laboratory of Anhui Province, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, 230027, Hefei, P.R. China.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Melatonin receptor type 1AA [auth B]350Homo sapiensMutation(s): 0 
Gene Names: MTNR1A
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P48039 (Homo sapiens)
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Go to UniProtKB:  P48039
PHAROS:  P48039
GTEx:  ENSG00000168412 
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UniProt GroupP48039
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(i) subunit alpha-1B [auth C]353Homo sapiensMutation(s): 0 
Gene Names: GNAI1
EC: 3.6.5
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P63096 (Homo sapiens)
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PHAROS:  P63096
GTEx:  ENSG00000127955 
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UniProt GroupP63096
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1C [auth D]345Rattus norvegicusMutation(s): 0 
Gene Names: Gnb1
UniProt
Find proteins for P54311 (Rattus norvegicus)
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UniProt GroupP54311
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2D [auth E]67Bos taurusMutation(s): 0 
Gene Names: GNG2
Membrane Entity: Yes 
UniProt
Find proteins for P63212 (Bos taurus)
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
scFv16E [auth F]256synthetic constructMutation(s): 0 
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Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China--

Revision History  (Full details and data files)

  • Version 1.0: 2022-03-02
    Type: Initial release
  • Version 1.1: 2022-09-14
    Changes: Database references
  • Version 1.2: 2024-11-06
    Changes: Data collection, Structure summary