Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 6-mer - A1B1C1D1E1F1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 161.09 kDa 
• Atom Count: 8,939 
• Modelled Residue Count: 1,165 
• Deposited Residue Count: 1,423 
• Unique protein chains: 6

 6WZG

Human secretin receptor Gs complex

• PDB DOI:  https://doi.org/10.2210/pdb6WZG/pdb
• EM Map EMD-21972: EMDB EMDataResource

• Classification: MEMBRANE PROTEIN
• Organism(s): Homo sapiens, Lama glama
• Expression System: Trichoplusia ni, Escherichia coli
• Mutation(s): No 
• Membrane Protein: Yes  OPMPDBTMMemProtMDmpstruc


• Deposited: 2020-05-13 Released: 2020-08-12 
• Deposition Author(s): Piper, S.J., Belousoff, M.J., Danev, R.
• Funding Organization(s): National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK), National Health and Medical Research Council (NHMRC, Australia), Royal Society

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 2.30 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Structure and dynamics of the active Gs-coupled human secretin receptor.

Dong, M., Deganutti, G., Piper, S.J., Liang, Y.L., Khoshouei, M., Belousoff, M.J., Harikumar, K.G., Reynolds, C.A., Glukhova, A., Furness, S.G.B., Christopoulos, A., Danev, R., Wootten, D., Sexton, P.M., Miller, L.J.

(2020) Nat Commun 11: 4137-4137

• PubMed: 32811827 
• DOI: https://doi.org/10.1038/s41467-020-17791-4
• Primary Citation of Related Structures:  
  6WI9, 6WZG


• PubMed Abstract: 
  

The class B secretin GPCR (SecR) has broad physiological effects, with target potential for treatment of metabolic and cardiovascular disease. Molecular understanding of SecR binding and activation is important for its therapeutic exploitation. We combined cryo-electron microscopy, molecular dynamics, and biochemical cross-linking to determine a 2.3 Å structure, and interrogate dynamics, of secretin bound to the SecR:Gs complex. SecR exhibited a unique organization of its extracellular domain (ECD) relative to its 7-transmembrane (TM) core, forming more extended interactions than other family members. Numerous polar interactions formed between secretin and the receptor extracellular loops (ECLs) and TM helices. Cysteine-cross-linking, cryo-electron microscopy multivariate analysis and molecular dynamics simulations revealed that interactions between peptide and receptor were dynamic, and suggested a model for initial peptide engagement where early interactions between the far N-terminus of the peptide and SecR ECL2 likely occur following initial binding of the peptide C-terminus to the ECD.

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Organizational Affiliation: 

Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Scottsdale, AZ, 85259, USA. [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Secretin	A [auth P]	27	Homo sapiens	Mutation(s): 0  Gene Names: SCT Membrane Entity: Yes
UniProt & NIH Common Fund Data Resources
Find proteins for P09683 (Homo sapiens) Explore P09683  Go to UniProtKB:  P09683
PHAROS:  P09683

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Secretin receptor	B [auth R]	453	Homo sapiens	Mutation(s): 0  Gene Names: SCTR Membrane Entity: Yes
UniProt & NIH Common Fund Data Resources
Find proteins for P47872 (Homo sapiens) Explore P47872  Go to UniProtKB:  P47872
PHAROS:  P47872

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Guanine nucleotide-binding protein G(s) subunit alpha isoforms short	C [auth A]	394	Homo sapiens	Mutation(s): 0  Gene Names: GNAS, GNAS1, GSP Membrane Entity: Yes
UniProt & NIH Common Fund Data Resources
Find proteins for P63092 (Homo sapiens) Explore P63092  Go to UniProtKB:  P63092
PHAROS:  P63092

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1	D [auth B]	340	Homo sapiens	Mutation(s): 0  Gene Names: GNB1
UniProt & NIH Common Fund Data Resources
Find proteins for P62873 (Homo sapiens) Explore P62873  Go to UniProtKB:  P62873
PHAROS:  P62873

Entity ID: 5
Molecule	Chains	Sequence Length	Organism	Details	Image
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2	E [auth G]	71	Homo sapiens	Mutation(s): 0  Gene Names: GNG2 Membrane Entity: Yes
UniProt & NIH Common Fund Data Resources
Find proteins for P59768 (Homo sapiens) Explore P59768  Go to UniProtKB:  P59768
PHAROS:  P59768

Entity ID: 6
Molecule	Chains	Sequence Length	Organism	Details	Image
Nanobody35	F [auth N]	138	Lama glama	Mutation(s): 0

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 2.30 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2020-08-12 
Deposition Author(s): Piper, S.J., Belousoff, M.J., Danev, R.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)	United States	GM-132095
National Health and Medical Research Council (NHMRC, Australia)	Australia	1120919
National Health and Medical Research Council (NHMRC, Australia)	Australia	1150083
Royal Society	United Kingdom	BB/M006883/1

Revision History  

• Version 1.0: 2020-08-12
  Type: Initial release
  
• Version 1.1: 2020-09-02
  Changes: Database references