1YEK

CATALYTIC ANTIBODY D2.3 COMPLEX


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.200 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crossreactivity, efficiency and catalytic specificity of an esterase-like antibody.

Gigant, B.Charbonnier, J.B.Eshhar, Z.Green, B.S.Knossow, M.

(1998) J Mol Biol 284: 741-750

  • DOI: 10.1006/jmbi.1998.2198
  • Primary Citation of Related Structures:  
    1YEK, 1YEJ, 1YEI

  • PubMed Abstract: 
  • The antibody D2.3 catalyzes the hydrolysis of several p-nitrobenzyl and p-nitrophenyl esters with significant rate enhancement; product inhibition is observed with the former compounds but not with the latter. Whereas enzyme specificity has been extensively studied by X-ray crystallography, structural data on catalytic antibodies have thus far related only to one of the reactions they catalyze ...

    The antibody D2.3 catalyzes the hydrolysis of several p-nitrobenzyl and p-nitrophenyl esters with significant rate enhancement; product inhibition is observed with the former compounds but not with the latter. Whereas enzyme specificity has been extensively studied by X-ray crystallography, structural data on catalytic antibodies have thus far related only to one of the reactions they catalyze. To investigate the substrate specificity and the substrate relative to product selectivity of D2.3, we have determined the structures of its complexes with two p-nitrophenyl phosphonate transition state analogs (TSAs) and with the reaction product, p-nitrophenol. The complexes with these TSAs, determined at 1.9 A resolution, and that with p-nitrobenzyl phosphonate determined previously, differ mainly by the locations and conformations of the ligands. Taken together with kinetic data, the structures suggest that a hydrogen bond to an atom of the substrate distant by eight covalent bonds from the carbonyl group of the hydrolyzed ester bond contributes to catalytic efficiency and substrate specificity. The structure of Fab D2.3 complexed with p-nitrophenol was determined at 2.1 A resolution. Release of p-nitrophenol is facilitated due to the unfavourable interaction of the partial charge of the nitro group of p-nitrophenolate with the hydrophobic cavity where it is located, and to the absence of a direct hydrogen bond between the product and the Fab. Catalytic specificity and the manner of product release are both affected by interactions with substrate atoms remote from the reaction center that were not programmed in the design of the TSA used to elicit this antibody. Selection of a catalytic antibody that makes use of TSA unprogrammed features has been made practical because of the screening for catalytic efficiency incorporated in the procedure used to obtain it.


    Organizational Affiliation

    UPR 9063 Centre National de la Recherche Scientifique, Bat. 34 Avenue de la Terrasse, Gif sur Yvette Cedex, 91198, France.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN (IG ANTIBODY D2.3 (LIGHT CHAIN))A [auth L]219Mus musculusMutation(s): 0 
Gene Names: Igk
UniProt
Find proteins for Q58EU8 (Mus musculus)
Explore Q58EU8 
Go to UniProtKB:  Q58EU8
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN (IG ANTIBODY D2.3 (HEAVY CHAIN))B [auth H]222Mus musculusMutation(s): 0 
Gene Names: Ighg
UniProt
Find proteins for P01863 (Mus musculus)
Explore P01863 
Go to UniProtKB:  P01863
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.200 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 78.73α = 90
b = 78.73β = 90
c = 159.03γ = 120
Software Package:
Software NamePurpose
MOSFLMdata reduction
AGROVATAdata reduction
AMoREphasing
X-PLORrefinement
AGROVATAdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-01-13
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance