6NIY

A high-resolution cryo-electron microscopy structure of a calcitonin receptor-heterotrimeric Gs protein complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.34 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history

Re-refinement Note

This entry reflects an alternative modeling of the original data in:5uz7


Literature

The Molecular Control of Calcitonin Receptor Signaling.

Dal Maso, E.Glukhova, A.Zhu, Y.Garcia-Nafria, J.Tate, C.G.Atanasio, S.Reynolds, C.A.Ramirez-Aportela, E.Carazo, J.M.Hick, C.A.Furness, S.G.B.Hay, D.L.Liang, Y.L.Miller, L.J.Christopoulos, A.Wang, M.W.Wootten, D.Sexton, P.M.

(2019) Acs Pharmacol Transl Sci 2: 31-51

  • DOI: 10.1021/acsptsci.8b00056
  • Primary Citation of Related Structures:  
    6NIY

  • PubMed Abstract: 
  • The calcitonin receptor (CTR) is a class B G protein-coupled receptor (GPCR) that responds to the peptide hormone calcitonin (CT). CTs are clinically approved for the treatment of bone diseases. We previously reported a 4.1 Å structure of the activated CTR bound to salmon CT (sCT) and heterotrimeric Gs protein by cryo-electron microscopy (Liang, Y ...

    The calcitonin receptor (CTR) is a class B G protein-coupled receptor (GPCR) that responds to the peptide hormone calcitonin (CT). CTs are clinically approved for the treatment of bone diseases. We previously reported a 4.1 Å structure of the activated CTR bound to salmon CT (sCT) and heterotrimeric Gs protein by cryo-electron microscopy (Liang, Y.-L., et al . Phase-plate cryo- EM structure of a class B GPCR-G protein complex. Nature 2017 , 546 , 118-123). In the current study, we have reprocessed the electron micrographs to yield a 3.3 Å map of the complex. This has allowed us to model extracellular loops (ECLs) 2 and 3, and the peptide N-terminus that previously could not be resolved. We have also performed alanine scanning mutagenesis of ECL1 and the upper segment of transmembrane helix 1 (TM1) and its extension into the receptor extracellular domain (TM1 stalk), with effects on peptide binding and function assessed by cAMP accumulation and ERK1/2 phosphorylation. These data were combined with previously published alanine scanning mutagenesis of ECL2 and ECL3 and the new structural information to provide a comprehensive 3D map of the molecular surface of the CTR that controls binding and signaling of distinct CT and related peptides. The work highlights distinctions in how different, related, class B receptors may be activated. The new mutational data on the TM1 stalk and ECL1 have also provided critical insights into the divergent control of cAMP versus pERK signaling and, collectively with previous mutagenesis data, offer evidence that the conformations linked to these different signaling pathways are, in many ways, mutually exclusive. This study furthers our understanding of the complex nature of signaling elicited by GPCRs and, in particular, that of the therapeutically important class B subfamily.


    Organizational Affiliation

    School of Pharmacy, Fudan University, Shanghai 201203, China.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(s) subunit alpha isoforms shortA394Homo sapiensMutation(s): 0 
Gene Names: GNASGNAS1GSP
Membrane Entity: Yes 
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PHAROS:  P63092
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Nanobody35B [auth N]138Lama glamaMutation(s): 0 
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Calcitonin receptorC [auth R]474Homo sapiensMutation(s): 0 
Gene Names: CALCR
Membrane Entity: Yes 
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Find proteins for P30988 (Homo sapiens)
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1D [auth B]340Homo sapiensMutation(s): 0 
Gene Names: GNB1
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2E [auth G]71Homo sapiensMutation(s): 0 
Gene Names: GNG2
Membrane Entity: Yes 
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Find proteins for P59768 (Homo sapiens)
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
CalcitoninF [auth P]32Oncorhynchus sp.Mutation(s): 0 
Gene Names: CGRP
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Find proteins for Q92163 (Oncorhynchus sp.)
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.34 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Health and Medical Research Council (NHMRC, Australia)Australia1061044
National Health and Medical Research Council (NHMRC, Australia)Australia1065410
National Health and Medical Research Council (NHMRC, Australia)Australia1055134
National Health and Medical Research Council (NHMRC, Australia)Australia1126857

Revision History  (Full details and data files)

  • Version 1.0: 2019-01-23
    Type: Initial release
  • Version 1.1: 2019-08-07
    Changes: Data collection, Database references
  • Version 1.2: 2019-12-18
    Changes: Author supporting evidence, Other
  • Version 1.3: 2020-04-08
    Changes: Data collection, Database references