1CE1

1.9A STRUCTURE OF THE THERAPEUTIC ANTIBODY CAMPATH-1H FAB IN COMPLEX WITH A SYNTHETIC PEPTIDE ANTIGEN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.220 

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This is version 1.3 of the entry. See complete history


Literature

1.9 A structure of the therapeutic antibody CAMPATH-1H fab in complex with a synthetic peptide antigen.

James, L.C.Hale, G.Waldmann, H.Bloomer, A.C.

(1999) J Mol Biol 289: 293-301

  • DOI: 10.1006/jmbi.1999.2750
  • Primary Citation of Related Structures:  
    1CE1

  • PubMed Abstract: 
  • CAMPATH-1 antibodies have a long and successful history in the treatment of leukaemia, autoimmune disease and transplant rejection. The first antibody to undergo "humanisation", CAMPATH-1H, permits treatment with limited patient anti-globulin response. It recognises the CD52 antigen which is a small glycosylphosphatidylinositol(GPI)-anchored protein expressed on lymphocytes and mediates cell depletion ...

    CAMPATH-1 antibodies have a long and successful history in the treatment of leukaemia, autoimmune disease and transplant rejection. The first antibody to undergo "humanisation", CAMPATH-1H, permits treatment with limited patient anti-globulin response. It recognises the CD52 antigen which is a small glycosylphosphatidylinositol(GPI)-anchored protein expressed on lymphocytes and mediates cell depletion. We present the 1.9 A structure of the CAMPATH-1H Fab complexed [corrected] with an analogue of the antigenic determinant of CD52. Analysis of the CAMPATH-1H binding site reveals that in contrast to most antibodies CDR L3 plays a dominant role in antigen binding. Furthermore CDR H3, which is essential for effective antigen recognition in most antibodies, participates in only two main-chain interactions in CAMPATH-1H. The CAMPATH-1H binding site is highly basic; ionic interaction with the enthanolamine phosphate of the CD52 GPI anchor has long been hypothesised to be important in antigen binding. The structure reveals a number of important specific ionic interactions, including Lys53H but not Lys52bH as had previously been suggested. Prolonged treatment with CAMPATH-1H can lead to patient anti-idiotype responses which may be exacerbated by the unusually high number of basic residues in the antibody. This suggests that a strategy where redundant basic residues are replaced with neutral counterparts may be effective in further reducing the immunogenicity of this versatile and widely used antibody.


    Organizational Affiliation

    MRC Laboratory of Molecular Biology, Hills Road, Cambridge, CB2 2QH, UK.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN (CAMPATH-1H:LIGHT CHAIN)A [auth L]211Homo sapiensMutation(s): 0 
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN (CAMPATH-1H:HEAVY CHAIN)B [auth H]220Homo sapiensMutation(s): 0 
UniProt
Find proteins for Q6PYX1 (Homo sapiens)
Explore Q6PYX1 
Go to UniProtKB:  Q6PYX1
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN (PEPTIDE ANTIGEN)C [auth P]8N/AMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.220 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.846α = 90
b = 60.672β = 89.72
c = 152.908γ = 89.85
Software Package:
Software NamePurpose
AMoREphasing
REFMACrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-06-25
    Type: Initial release
  • Version 1.1: 2008-04-26
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2013-09-18
    Changes: Source and taxonomy