8DC0 | pdb_00008dc0

Rat Betaglycan Zona Pellucida Domain (ZPC) in complex with mini monomer TGFb2 (mmTGF-b2-7M2R)

• PDB DOI: https://doi.org/10.2210/pdb8DC0/pdb

• Classification: CYTOKINE
• Organism(s): Rattus norvegicus, Homo sapiens
• Expression System: Homo sapiens, Escherichia coli
• Mutation(s): No 


• Deposited: 2022-06-15 Released: 2023-06-21 
• Deposition Author(s): Wieteska, L., Taylor, A.B., Hinck, A.P.
• Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS), H2020 Marie Curie Actions of the European Commission

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.93 Å
• R-Value Free: 
  0.257 (Depositor), 0.257 (DCC) 
• R-Value Work: 
  0.219 (Depositor), 0.218 (DCC) 
• R-Value Observed: 
  0.222 (Depositor) 

Starting Models: experimental

Literature

Structures of TGF-beta with betaglycan and signaling receptors reveal mechanisms of complex assembly and signaling.

Wieteska, L., Taylor, A.B., Punch, E., Coleman, J.A., Conway, I.O., Lin, Y.F., Byeon, C.H., Hinck, C.S., Krzysiak, T., Ishima, R., Lopez-Casillas, F., Cherepanov, P., Bernard, D.J., Hill, C.S., Hinck, A.P.

(2025) Nat Commun 16: 1778-1778

• PubMed: 40011426 
• DOI: https://doi.org/10.1038/s41467-025-56796-9
• Primary Citation Related Structures: 
  8DC0, 9B9F, 9FDY, 9FK5, 9FKP


• PubMed Abstract: 
  

  Betaglycan (BG) is a transmembrane co-receptor of the transforming growth factor-β (TGF-β) family of signaling ligands. It is essential for embryonic development, tissue homeostasis and fertility in adults. It functions by enabling binding of the three TGF-β isoforms to their signaling receptors and is additionally required for inhibin A (InhA) activity. Despite its requirement for the functions of TGF-βs and InhA in vivo, structural information explaining BG ligand selectivity and its mechanism of action is lacking. Here, we determine the structure of TGF-β bound both to BG and the signaling receptors, TGFBR1 and TGFBR2. We identify key regions responsible for ligand engagement, which has revealed binding interfaces that differ from those described for the closely related co-receptor of the TGF-β family, endoglin, thus demonstrating remarkable evolutionary adaptation to enable ligand selectivity. Finally, we provide a structural explanation for the hand-off mechanism underlying TGF-β signal potentiation.

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Organizational Affiliation: 
• Department of Structural Biology, University of Pittsburgh, Pittsburgh, PA, USA.
Faculty of Biological Sciences, Astbury Centre for Structural Studies, University of Leeds, Leeds, UK.
Developmental Signalling Laboratory, The Francis Crick Institute, London, NW1 1AT, UK.
Department of Biochemistry & Structural Biology and Greehey Children's Cancer Research Institute, The University of Texas Health Science Center at San Antonio, San Antonio, TX, USA.
Chromatin Structure and Mobile DNA Laboratory, The Francis Crick Institute, London, NW1 1AT, UK.
Department of Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada.
Departmento de Biología Celular y del Desarrollo, Instituto de Fisiología Celular, UNAM, Mexico City, Mexico.
Developmental Signalling Laboratory, The Francis Crick Institute, London, NW1 1AT, UK. [e-mail].
Department of Structural Biology, University of Pittsburgh, Pittsburgh, PA, USA. [e-mail].

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: surface plasmon resonance, isothermal titration calorimetry, gel filtration

Macromolecule Content 

• Total Structure Weight: 32.86 kDa 
• Atom Count: 2,131 
• Modeled Residue Count: 255 
• Deposited Residue Count: 286 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Transforming growth factor beta receptor type 3	A	174	Rattus norvegicus	Mutation(s): 0  Gene Names: Tgfbr3
UniProt
Find proteins for P26342 (Rattus norvegicus) Explore P26342  Go to UniProtKB:  P26342

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Transforming growth factor beta-2	B	112	Homo sapiens	Mutation(s): 0  Gene Names: TGFB2
UniProt & NIH Common Fund Data Resources
Find proteins for P61812 (Homo sapiens) Explore P61812  Go to UniProtKB:  P61812
PHAROS:  P61812 GTEx:  ENSG00000092969

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.93 Å
• R-Value Free:  0.257 (Depositor), 0.257 (DCC) 
• R-Value Work:  0.219 (Depositor), 0.218 (DCC) 
• R-Value Observed: 0.222 (Depositor) 

Space Group: I 2 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 76.456	α = 90
b = 90.453	β = 90
c = 98.872	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
autoPROC	data reduction
Aimless	data scaling
PHASER	phasing

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2023-06-21 
Deposition Author(s): Wieteska, L., Taylor, A.B., Hinck, A.P.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	GM058067
H2020 Marie Curie Actions of the European Commission	European Union	893196

Revision History  

• Version 1.0: 2023-06-21
  Type: Initial release
  
• Version 1.1: 2023-10-25
  Changes: Data collection, Refinement description
• Version 1.2: 2024-10-23
  Changes: Structure summary
• Version 1.3: 2025-11-19
  Changes: Database references