Extracellular domain of type II Transforming Growth Factor Beta receptor in complex with NDSB-201

Experimental Data Snapshot

  • Resolution: 1.50 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.174 

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This is version 1.4 of the entry. See complete history


The non-detergent sulfobetaine-201 acts as a pharmacological chaperone to promote folding and crystallization of the type II TGF-beta receptor extracellular domain.

Wangkanont, K.Forest, K.T.Kiessling, L.L.

(2015) Protein Expr Purif 115: 19-25

  • DOI: https://doi.org/10.1016/j.pep.2015.06.001
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The roles of the extracellular domain of type II TGF-β receptor (TBRII-ECD) in physiological processes ranging from development to cancer to wound healing render it an attractive target for exploration with chemical tools. For such applications, large amounts of active soluble protein are needed, but the yields of TBRII-ECD we obtained with current folding protocols were variable. To expedite the identification of alternative folding conditions, we developed an on-plate screen. This assay indicated that effective folding additives included the non-detergent sulfobetaine-201 (NDSB-201). Although NDSB-201 can facilitate protein folding, the mode by which it does so is poorly understood. We postulated that specific interactions between NDSB-201 and TBRII-ECD might be responsible. Analysis by X-ray crystallography indicates that the TBRII-ECD possesses a binding pocket for NDSB-201. The pyridinium group of the additive stacks with a phenylalanine side chain in the binding site. The ability of NDSB-201 to occupy a pocket on the protein provides a molecular mechanism for the additive's ability to minimize TBRII-ECD aggregation and stabilize the folded state. NDSB-201 also accelerates TBRII-ECD crystallization, suggesting it may serve as a useful crystallization additive for proteins refolded with it. Our results also suggest there is a site on TBRII-ECD that could be targeted by small-molecule modulators.

  • Organizational Affiliation

    Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, WI 53706, United States. Electronic address: wangkanont@wisc.edu.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
TGF-beta receptor type-2112Homo sapiensMutation(s): 2 
Gene Names: TGFBR2
UniProt & NIH Common Fund Data Resources
Find proteins for P37173 (Homo sapiens)
Explore P37173 
Go to UniProtKB:  P37173
GTEx:  ENSG00000163513 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP37173
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on 1PS

Download Ideal Coordinates CCD File 
C8 H11 N O3 S
Experimental Data & Validation

Experimental Data

  • Resolution: 1.50 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.174 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 33.574α = 90
b = 40.463β = 90
c = 75.837γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
PDB_EXTRACTdata extraction
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM055984

Revision History  (Full details and data files)

  • Version 1.0: 2015-06-24
    Type: Initial release
  • Version 1.1: 2015-09-30
    Changes: Database references
  • Version 1.2: 2017-09-13
    Changes: Author supporting evidence, Derived calculations, Refinement description
  • Version 1.3: 2019-12-25
    Changes: Author supporting evidence
  • Version 1.4: 2023-09-27
    Changes: Data collection, Database references, Refinement description, Structure summary