2IFF image
Entry Detail
PDB ID:
2IFF
Title:
STRUCTURE OF AN ANTIBODY-LYSOZYME COMPLEX: EFFECT OF A CONSERVATIVE MUTATION
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
1994-02-03
Release Date:
1994-05-31
Method Details:
Experimental Method:
Resolution:
2.65 Å
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:IGG1 HYHEL-5 FAB (HEAVY CHAIN)
Chain IDs:B (auth: H)
Chain Length:215
Number of Molecules:1
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Description:IGG1 HYHEL-5 FAB (LIGHT CHAIN)
Chain IDs:A (auth: L)
Chain Length:212
Number of Molecules:1
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Description:HEN EGG WHITE LYSOZYME
Mutations:R68K
Chain IDs:C (auth: Y)
Chain Length:129
Number of Molecules:1
Biological Source:Gallus gallus
Primary Citation
Structure of an antibody-lysozyme complex unexpected effect of conservative mutation.
J.Mol.Biol. 245 261 274 (1995)
PMID: 7531245 DOI: 10.1006/jmbi.1994.0022

Abstact

The structure of the complex between the Fab HyHEL-5 and chicken lysozyme revealed a large interface region containing 23 lysozyme and 28 Fab residues. Arg68 of the lysozyme is centrally placed in this interface and theoretical studies together with binding assays of this Fab to different avian lysozymes have previously shown that this arginine residue is an important contributor to the binding. The Arg68-->Lys mutant binds 10(3) times less well to the HyHEL-5 Fab. We have examined the refined crystal structure of the complex of this mutant lysozyme with the Fab. No global changes occur, but there is an introduction of a new water molecule into the interface that mediates the hydrogen bonding interactions between the lysine and residues on the Fab. These data are compared with the effects of similar changes on the inhibition of serine proteases such as trypsin where the energetic effects of this substitution are small.

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Primary Citation of related structures