4K5U

Recognition of the BG-H Antigen by a Lamprey Variable Lymphocyte Receptor

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.206 

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Literature

Recognition of the thomsen-friedenreich pancarcinoma carbohydrate antigen by a lamprey variable lymphocyte receptor.

Luo, M., Velikovsky, C.A., Yang, X., Siddiqui, M.A., Hong, X., Barchi, J.J., Gildersleeve, J.C., Pancer, Z., Mariuzza, R.A.

(2013) J Biol Chem 288: 23597-23606

  • DOI: 10.1074/jbc.M113.480467
  • Primary Citation of Related Structures:  
    4K5U, 4K79

  • PubMed Abstract: 

    • Variable lymphocyte receptors (VLRs) are leucine-rich repeat proteins that mediate adaptive immunity in jawless vertebrates. VLRs were recently shown to recognize glycans, such as the tumor-associated Thomsen-Friedenreich antigen (TFα; Galβ1-3GalNAcα), with a selectivity rivaling or exceeding that of lectins and antibodies ...

    Variable lymphocyte receptors (VLRs) are leucine-rich repeat proteins that mediate adaptive immunity in jawless vertebrates. VLRs were recently shown to recognize glycans, such as the tumor-associated Thomsen-Friedenreich antigen (TFα; Galβ1-3GalNAcα), with a selectivity rivaling or exceeding that of lectins and antibodies. To understand the basis for TFα recognition by one such VLR (VLRB.aGPA.23), we measured thermodynamic parameters for the binding interaction and determined the structure of the VLRB.aGPA.23-TFα complex to 2.2 Å resolution. In the structure, four tryptophan residues form a tight hydrophobic cage encasing the TFα disaccharide that completely excludes buried water molecules. This cage together with hydrogen bonding of sugar hydroxyls to polar side chains explains the exquisite selectivity of VLRB.aGPA.23. The topology of the glycan-binding site of VLRB.aGPA.23 differs markedly from those of lectins or antibodies, which typically consist of long, convex grooves for accommodating the oligosaccharide. Instead, the TFα disaccharide is sandwiched between a variable loop and the concave surface of the VLR formed by the β-strands of the leucine-rich repeat modules. Longer oligosaccharides are predicted to extend perpendicularly across the β-strands, requiring them to bend to match the concavity of the VLR solenoid.

    Organizational Affiliation: 

    University of Maryland Institute for Bioscience and Biotechnology Research, W. M. Keck Laboratory for Structural Biology, Rockville, Maryland 20850, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Variable lymphocyte receptorB [auth A],
A [auth B],
C,
D		220Petromyzon marinusMutation(s): 0 
UniProt
Find proteins for K0IE77 (Petromyzon marinus)
Explore K0IE77 
Go to UniProtKB:  K0IE77
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupK0IE77
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GAL
Query on GAL
Download Ideal Coordinates CCD File 
E [auth B],
F [auth A],
G [auth C],
H [auth D]		beta-D-galactopyranose
C6 H12 O6
WQZGKKKJIJFFOK-FPRJBGLDSA-N		 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
GAL Binding MOAD:  4K5U Ka: 9600 (M^-1) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.206 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.71α = 72.03
b = 62.784β = 71.39
c = 63.366γ = 84.35
Software Package:
Software NamePurpose
CrystalCleardata collection
AMoREphasing
REFMACrefinement
CrystalCleardata reduction
CrystalCleardata scaling

Structure Validation

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Ligand Structure Quality Assessment 


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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-06-26
    Type: Initial release
  • Version 1.1: 2013-07-03
    Changes: Database references
  • Version 1.2: 2013-08-28
    Changes: Database references
  • Version 1.3: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Database references, Derived calculations, Structure summary