Chicken GRIFIN (crystallisation pH: 8.5)

Experimental Data Snapshot

  • Resolution: 1.10 Å
  • R-Value Free: 0.158 
  • R-Value Work: 0.139 
  • R-Value Observed: 0.140 

wwPDB Validation   3D Report Full Report

This is version 2.1 of the entry. See complete history


Chicken GRIFIN: Structural characterization in crystals and in solution.

Ruiz, F.M.Gilles, U.Ludwig, A.K.Sehad, C.Shiao, T.C.Garcia Caballero, G.Kaltner, H.Lindner, I.Roy, R.Reusch, D.Romero, A.Gabius, H.J.

(2018) Biochimie 146: 127-138

  • DOI: https://doi.org/10.1016/j.biochi.2017.12.003
  • Primary Citation of Related Structures:  
    5NLD, 5NLE, 5NLH, 5NLZ, 5NM1, 5NM6, 5NMJ

  • PubMed Abstract: 

    Despite its natural abundance in lenses of vertebrates the physiological function(s) of the galectin-related inter-fiber protein (GRIFIN) is (are) still unclear. The same holds true for the significance of the unique interspecies (fish/birds vs mammals) variability in the capacity to bind lactose. In solution, ultracentrifugation and small angle X-ray scattering (at concentrations up to 9 mg/mL) characterize the protein as compact and stable homodimer without evidence for aggregation. The crystal structure of chicken (C-)GRIFIN at seven pH values from 4.2 to 8.5 is reported, revealing compelling stability. Binding of lactose despite the Arg71Val deviation from the sequence signature of galectins matched the otherwise canonical contact pattern with thermodynamics of an enthalpically driven process. Upon lactose accommodation, the side chain of Arg50 is shifted for hydrogen bonding to the 3-hydroxyl of glucose. No evidence for a further ligand-dependent structural alteration was obtained in solution by measuring hydrogen/deuterium exchange mass spectrometrically in peptic fingerprints. The introduction of the Asn48Lys mutation, characteristic for mammalian GRIFINs that have lost lectin activity, lets labeled C-GRIFIN maintain capacity to stain tissue sections. Binding is no longer inhibitable by lactose, as seen for the wild-type protein. These results establish the basis for detailed structure-activity considerations and are a step to complete the structural description of all seven members of the galectin network in chicken.

  • Organizational Affiliation

    Chemical and Physical Biology, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040 Madrid, Spain.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Galectin139Gallus gallusMutation(s): 0 
Gene Names: GRIFIN
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence


Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
Glycosylation Resources
GlyTouCan:  G88362QR
GlyCosmos:  G88362QR
GlyGen:  G88362QR
Biologically Interesting Molecules (External Reference) 1 Unique
Experimental Data & Validation

Experimental Data

  • Resolution: 1.10 Å
  • R-Value Free: 0.158 
  • R-Value Work: 0.139 
  • R-Value Observed: 0.140 
  • Space Group: P 42 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 80.742α = 90
b = 80.742β = 90
c = 39.238γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
European Union317297 (GLYCOPHARM)

Revision History  (Full details and data files)

  • Version 1.0: 2018-02-14
    Type: Initial release
  • Version 1.1: 2018-02-21
    Changes: Database references
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Non-polymer description, Structure summary
  • Version 2.1: 2024-01-17
    Changes: Data collection, Database references, Refinement description, Structure summary