6EV2

Crystal structure of antibody against schizophyllan in complex with laminarihexaose


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.195 

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This is version 2.0 of the entry. See complete history


Literature

Structural insights into antigen recognition of an anti-beta-(1,6)-beta-(1,3)-D-glucan antibody.

Sung, K.H.Josewski, J.Dubel, S.Blankenfeldt, W.Rau, U.

(2018) Sci Rep 8: 13652-13652

  • DOI: 10.1038/s41598-018-31961-x
  • Primary Citation of Related Structures:  
    6EV1, 6EV2

  • PubMed Abstract: 
  • Schizophyllan (SCH) is a high molecular weight homopolysaccharide composed of a β-(1,3)-D-glucan main chain with branching β-(1,6)-bound D-glucose residues. It forms triple helices that are highly stable towards heat and extreme pH, which provides SCH with interesting properties for industrial and medical applications ...

    Schizophyllan (SCH) is a high molecular weight homopolysaccharide composed of a β-(1,3)-D-glucan main chain with branching β-(1,6)-bound D-glucose residues. It forms triple helices that are highly stable towards heat and extreme pH, which provides SCH with interesting properties for industrial and medical applications. The recombinant anti-SCH antibody JoJ48C11 recognizes SCH and related β-(1,6)-branched β-(1,3)-D-glucans, but details governing its specificity are not known. Here, we fill this gap by determining crystal structures of the antigen binding fragment (Fab) of JoJ48C11 in the apo form and in complex with the unbranched β-(1,3)-D-glucose hexamer laminarihexaose 3.0 and 2.4 Å resolution, respectively. Together with docking studies, this allowed construction of a JoJ48C11/triple-helical SCH complex, leading to the identification of eight amino acid residues of JoJ48C11 (Tyr27 H , His35 H , Trp47 H , Trp100 H , Asp105 H ; Asp49 L , Lys52 L , Trp90 L ) that contribute to the recognition of glucose units from all three chains of the SCH triple helix. The importance of these amino acids was confirmed by mutagenesis and ELISA-based analysis. Our work provides an explanation for the specific recognition of triple-helical β-(1,6)-branched β-(1,3)-D-glucans by JoJ48C11 and provides another structure example for anti-carbohydrate antibodies.


    Organizational Affiliation

    Department of Biotechnology, Institute for Biochemistry, Biotechnology and Bioinformatics, Technische Universität Braunschweig, Spielmannstraße 17, 38106, Braunschweig, Germany. U.Rau@tu-bs.de.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Heavy chainA, C, E, G222Mus musculusMutation(s): 0 
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Light chainB, D, F, H217Mus musculusMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Oligosaccharides

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Entity ID: 3
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
beta-D-glucopyranose-(1-3)-beta-D-glucopyranoseI2N/A Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G36535HU
GlyCosmos:  G36535HU
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BGC (Subject of Investigation/LOI)
Query on BGC

Download Ideal Coordinates CCD File 
J [auth A]beta-D-glucopyranose
C6 H12 O6
WQZGKKKJIJFFOK-VFUOTHLCSA-N
 Ligand Interaction
Biologically Interesting Molecules (External Reference) 1 Unique
Entity ID: 3
IDChainsNameType/Class2D Diagram3D Interactions
PRD_900024
Query on PRD_900024
Ibeta-laminaribioseOligosaccharide / Antimicrobial Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.195 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 81.732α = 90
b = 131.502β = 91.5
c = 91.034γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
autoPROCdata scaling
PHENIXphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-09-26
    Type: Initial release
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Refinement description, Structure summary