1KN4 image
Deposition Date 2001-12-18
Release Date 2002-03-13
Last Version Date 2024-10-30
Entry Detail
PDB ID:
1KN4
Keywords:
Title:
CATALYTIC ANTIBODY D2.3 COMPLEX
Biological Source:
Source Organism:
Mus musculus (Taxon ID: 10090)
Method Details:
Experimental Method:
Resolution:
1.90 Å
R-Value Free:
0.24
R-Value Work:
0.21
Space Group:
P 31 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:IG ANTIBODY D2.3 (HEAVY CHAIN)
Chain IDs:B (auth: H)
Chain Length:222
Number of Molecules:1
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Molecule:IG ANTIBODY D2.3 (LIGHT CHAIN)
Chain IDs:A (auth: L)
Chain Length:219
Number of Molecules:1
Biological Source:Mus musculus
Primary Citation
Remarkable remote chiral recognition in a reaction mediated by a catalytic antibody.
J.Am.Chem.Soc. 124 2114 2115 (2002)
PMID: 11878955 DOI: 10.1021/ja0170504

Abstact

The crystal structures of catalytic antibody D2.3 Fab with the two enantiomers, 7D and 7L, which represent transition state analogues for the hydrolysis of the corresponding esters, 6D and 6L, were determined to better understand remarkable reactivity differences: the L-ester displayed significantly tighter binding (K(M)) and increased catalytic activity (k(cat)) with D2.3, even though the chiral center is 7 bonds distant from the reaction center. Surprisingly, the electron densities of the liganded phosphonates, 7D and 7L, within the D2.3 binding/reaction site were essentially identical, highlighting the subtle influences of protein interactions on chemical behavior.

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Primary Citation of related structures