8IBU

Cryo-EM structure of the erythromycin-bound motilin receptor-Gq protein complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.51 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural basis for motilin and erythromycin recognition by motilin receptor.

You, C.Zhang, Y.Xu, Y.Xu, P.Li, Z.Li, H.Huang, S.Chen, Z.Li, J.Xu, H.E.Jiang, Y.

(2023) Sci Adv 9: eade9020-eade9020

  • DOI: https://doi.org/10.1126/sciadv.ade9020
  • Primary Citation of Related Structures:  
    8IBU, 8IBV

  • PubMed Abstract: 

    Motilin is an endogenous peptide hormone almost exclusively expressed in the human gastrointestinal (GI) tract. It activates the motilin receptor (MTLR), a class A G protein-coupled receptor (GPCR), and stimulates GI motility. To our knowledge, MTLR is the first GPCR reported to be activated by macrolide antibiotics, such as erythromycin. It has attracted extensive attention as a potential drug target for GI disorders. We report two structures of G q -coupled human MTLR bound to motilin and erythromycin. Our structures reveal the recognition mechanism of both ligands and explain the specificity of motilin and ghrelin, a related gut peptide hormone, for their respective receptors. These structures also provide the basis for understanding the different recognition modes of erythromycin by MTLR and ribosome. These findings provide a framework for understanding the physiological regulation of MTLR and guiding drug design targeting MTLR for the treatment of GI motility disorders.


  • Organizational Affiliation

    State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(q) subunit alpha361Homo sapiensMutation(s): 0 
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Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1371Homo sapiensMutation(s): 0 
Gene Names: GNB1
UniProt & NIH Common Fund Data Resources
Find proteins for P62873 (Homo sapiens)
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PHAROS:  P62873
GTEx:  ENSG00000078369 
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UniProt GroupP62873
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
scFv16C [auth E]247Homo sapiensMutation(s): 0 
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2D [auth G]70Homo sapiensMutation(s): 0 
Gene Names: GNG2
Membrane Entity: Yes 
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Find proteins for P59768 (Homo sapiens)
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GTEx:  ENSG00000186469 
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UniProt GroupP59768
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Soluble cytochrome b562,Motilin receptor,Fusion tagE [auth R]741Escherichia coliHomo sapiensMutation(s): 0 
Gene Names: cybCMLNRGPR38MTLRMTLR1
Membrane Entity: Yes 
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Find proteins for P0ABE7 (Escherichia coli)
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Find proteins for O43193 (Homo sapiens)
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PHAROS:  O43193
GTEx:  ENSG00000102539 
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UniProt GroupsO43193P0ABE7
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
ERY (Subject of Investigation/LOI)
Query on ERY

Download Ideal Coordinates CCD File 
F [auth R]ERYTHROMYCIN A
C37 H67 N O13
ULGZDMOVFRHVEP-RWJQBGPGSA-N
Binding Affinity Annotations 
IDSourceBinding Affinity
ERY BindingDB:  8IBU Ki: 3.70e+4 (nM) from 1 assay(s)
IC50: min: 44, max: 71 (nM) from 2 assay(s)
EC50: min: 50.12, max: 1000 (nM) from 4 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.51 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: 2023-04-12
    Type: Initial release
  • Version 1.1: 2024-05-29
    Changes: Data collection