3HNT

CS-35 Fab complex with a linear, terminal oligoarabinofuranosyl tetrasaccharide from lipoarabinomannan


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.199 

wwPDB Validation 3D Report Full Report



Literature

Structural insights into antibody recognition of mycobacterial polysaccharides.

Murase, T.Zheng, R.B.Joe, M.Bai, Y.Marcus, S.L.Lowary, T.L.Ng, K.K.

(2009) J Mol Biol 392: 381-392

  • DOI: 10.1016/j.jmb.2009.06.074
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Mycobacteria are major human pathogens responsible for such serious and widespread diseases as tuberculosis and leprosy. Among the evolutionary adaptations essential for pathogenicity in mycobacteria is a complex carbohydrate-rich cell-wall structure ...

    Mycobacteria are major human pathogens responsible for such serious and widespread diseases as tuberculosis and leprosy. Among the evolutionary adaptations essential for pathogenicity in mycobacteria is a complex carbohydrate-rich cell-wall structure that contains as a major immunomodulatory molecule the polysaccharide lipoarabinomannan (LAM). We report here crystal structures of three fragments from the non-reducing termini of LAM in complex with a murine antibody Fab fragment (CS-35Fab). These structures reveal for the first time the three-dimensional structures of key components of LAM and the molecular basis of LAM recognition at between 1.8- and 2.0-A resolution. The antigen-binding site of CS-35Fab forms three binding pockets that show a high degree of complementarity to the reducing end, the branch point and one of the non-reducing ends of the Y-shaped hexasaccharide moiety found at most of the non-reducing termini of LAM. Structures of CS-35Fab bound to two additional tetrasaccharides confirm the general mode of binding seen in the hexasaccharide and indicate how different parts of LAM are recognized. Altogether, these structures provide a rational basis for understanding the overall architecture of LAM and identify the key elements of an epitope that may be exploited for the development of novel and more effective anti-mycobacterial vaccines. Moreover, this study represents the first high-resolution X-ray crystallographic investigation of oligofuranoside-protein recognition.


    Organizational Affiliation

    Alberta Ingenuity Centre for Carbohydrate Science, University of Calgary, Calgary, Alberta, Canada.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CS-35 Fab Heavy ChainH220Mus musculusMutation(s): 0 
Protein Feature View
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  • Reference Sequence

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
CS-35 Fab Light ChainL214Mus musculusMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Oligosaccharides
Entity ID: 3
MoleculeChainsChain Length2D Diagram Glycosylation
beta-D-arabinofuranose-(1-2)-alpha-D-arabinofuranose-(1-5)-alpha-D-arabinofuranose-(1-5)-methyl alpha-D-arabinofuranoside
A
4 N/A
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.199 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 146.702α = 90
b = 95.787β = 102.52
c = 35.79γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
PHASERphasing
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-07-21
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Structure summary