7ASG

TGFBIp mutant R555W

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.207 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history. 


Literature

Mutation-induced dimerization of transforming growth factor-beta-induced protein may drive protein aggregation in granular corneal dystrophy.

Nielsen, N.S., Gadeberg, T.A.F., Poulsen, E.T., Harwood, S.L., Weberskov, C.E., Pedersen, J.S., Andersen, G.R., Enghild, J.J.

(2021) J Biol Chem 297: 100858-100858

  • DOI: 10.1016/j.jbc.2021.100858
  • Primary Citation of Related Structures:  
    7AS7, 7ASC, 7ASG

  • PubMed Abstract: 

    • Protein aggregation in the outermost layers of the cornea, which can lead to cloudy vision and in severe cases blindness, is linked to mutations in the extracellular matrix protein transforming growth factor-β-induced protein (TGFBIp). Among the most frequent pathogenic mutations are R124H and R555W, both associated with granular corneal dystrophy (GCD) characterized by the early-onset formation of amorphous aggregates ...

    Protein aggregation in the outermost layers of the cornea, which can lead to cloudy vision and in severe cases blindness, is linked to mutations in the extracellular matrix protein transforming growth factor-β-induced protein (TGFBIp). Among the most frequent pathogenic mutations are R124H and R555W, both associated with granular corneal dystrophy (GCD) characterized by the early-onset formation of amorphous aggregates. The molecular mechanisms of protein aggregation in GCD are largely unknown. In this study, we determined the crystal structures of R124H, R555W, and the lattice corneal dystrophy-associated A546T. Although there were no changes in the monomeric TGFBIp structure of any mutant that would explain their propensity to aggregate, R124H and R555W demonstrated a new dimer interface in the crystal packing, which is not present in wildtype TGFBIp or A546T. This interface, as seen in both the R124H and R555W structures, involves residue 124 of the first TGFBIp molecule and 555 in the second. The interface is not permitted by the Arg124 and Arg555 residues of wildtype TGFBIp and may play a central role in the aggregation exhibited by R124H and R555W in vivo. Using cross-linking mass spectrometry and in-line size exclusion chromatography-small-angle X-ray scattering, we characterized a dimer formed by wildtype and mutant TGFBIps in solution. Dimerization in solution also involves interactions between the N- and C-terminal domains of two TGFBIp molecules but was not identical to the crystal packing dimerization. TGFBIp-targeted interventions that disrupt the R124H/R555W crystal packing dimer interface might offer new therapeutic opportunities to treat patients with GCD.

    Organizational Affiliation: 

    Department of Molecular Biology and Genetics, Science Park, Aarhus University, Aarhus, Denmark. Electronic address: jje@mbg.au.dk.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Transforming growth factor-beta-induced protein ig-h3A594Homo sapiensMutation(s): 1 
Gene Names: TGFBI, BIGH3
UniProt & NIH Common Fund Data Resources
Find proteins for Q15582 (Homo sapiens)
Explore Q15582 
Go to UniProtKB:  Q15582
PHAROS:  Q15582
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ15582
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.207 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 78.06α = 90
b = 98.49β = 90
c = 207.84γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2020-12-23
    Type: Initial release
  • Version 1.1: 2021-07-07
    Changes: Database references