2R1W

Crystal structure of S25-2 Fab in complex with Kdo analogues


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.221 

wwPDB Validation 3D Report Full Report



Literature

Exploration of specificity in germline monoclonal antibody recognition of a range of natural and synthetic epitopes.

Brooks, C.L.Muller-Loennies, S.Brade, L.Kosma, P.Hirama, T.MacKenzie, C.R.Brade, H.Evans, S.V.

(2008) J Mol Biol 377: 450-468

  • DOI: 10.1016/j.jmb.2008.01.018
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • To explore the molecular basis of antigen recognition by germline antibodies, we have determined to high resolution the structures of the near-germline monoclonal antibody S25-2 in complex with seven distinct carbohydrate antigens based on the bacter ...

    To explore the molecular basis of antigen recognition by germline antibodies, we have determined to high resolution the structures of the near-germline monoclonal antibody S25-2 in complex with seven distinct carbohydrate antigens based on the bacterial sugar 3-deoxy-alpha-D-manno-oct-2-ulosonic acid (Kdo). In contrast to previous findings, the inherited germline Kdo monosaccharide binding site is not restricted to this bacterial sugar but is able to accommodate an array of substitutions and chemical modifications of Kdo, including naturally occurring antigens containing the related monosaccharide d-glycero-alpha-d-talo-oct-2-ulosonic acid as well as nonterminal Kdo residues. However, we show by surface plasmon resonance and ELISA how antibody S25-2 specificity is so dependent on the context in which the antigen is presented that a free disaccharide displays strong binding while the same lipid-A-bound disaccharide does not bind. These structures provide insight into how inherited germline genes code for immunoglobulins of limited flexibility that are capable of binding a range of epitopes from which affinity-matured antibodies are generated.


    Organizational Affiliation

    Department of Biochemistry and Microbiology, University of Victoria, PO Box 3055 STN CSC, Victoria, BC, Canada.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Fab, antibody fragment (IgG1k), light chainA219N/AMutation(s): 0 
Find proteins for Q52L64 (Mus musculus)
Explore Q52L64 
Go to UniProtKB:  Q52L64
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  • Reference Sequence

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Fab, antibody fragment (IgG1k), heavy chainB222N/AMutation(s): 0 
Find proteins for A2NU21 (Mus musculus)
Explore A2NU21 
Go to UniProtKB:  A2NU21
Protein Feature View
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  • Reference Sequence
Oligosaccharides
Entity ID: 3
MoleculeChainsChain Length2D Diagram Glycosylation
3,4,5-trideoxy-alpha-D-erythro-oct-3-en-2-ulopyranosonic acid-(2-8)-prop-2-en-1-yl 3-deoxy-alpha-D-manno-oct-2-ulopyranosidonic acid
C
2 N/A N/A
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download CCD File 
A, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

Download CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
KDBKd :  25000   nM  PDBBind
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.221 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.68α = 90
b = 81.2β = 90
c = 131.95γ = 90
Software Package:
Software NamePurpose
d*TREKdata scaling
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction
d*TREKdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-12-30
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2018-03-07
    Changes: Data collection
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Database references, Derived calculations, Structure summary