4GQP image
Entry Detail
PDB ID:
4GQP
Keywords:
IMMUNE SYSTEM
Title:
Structure based design of sub-nanomolar affinity anti-methamphetamine single chain antibodies.
Biological Source:
Source Organism:
Mus musculus
Host Organism:
Pichia pastoris
PDB Version:
Deposition Date:
2012-08-23
Release Date:
2013-10-02
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.00 Å
R-Value Free:
0.25
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 1 21 1
4GQP validation report
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Anti-METH scFv
Chain IDs:A (auth: H)
Chain Length:249
Number of Molecules:1
Biological Source:Mus musculus
Ligand Molecules
B40
Primary Citation
Affinity improvement of a therapeutic antibody to methamphetamine and amphetamine through structure-based antibody engineering.
Sci Rep 4 3673 3673 (2014)
PMID: 24419156 DOI: 10.1038/srep03673

Abstact

Methamphetamine (METH) abuse is a worldwide threat, without any FDA approved medications. Anti-METH IgGs and single chain fragments (scFvs) have shown efficacy in preclinical studies. Here we report affinity enhancement of an anti-METH scFv for METH and its active metabolite amphetamine (AMP), through the introduction of point mutations, rationally designed to optimize the shape and hydrophobicity of the antibody binding pocket. The binding affinity was measured using saturation binding technique. The mutant scFv-S93T showed 3.1 fold enhancement in affinity for METH and 26 fold for AMP. The scFv-I37M and scFv-Y34M mutants showed enhancement of 94, and 8 fold for AMP, respectively. Structural analysis of scFv-S93T:METH revealed that the substitution of Ser residue by Thr caused the expulsion of a water molecule from the cavity, creating a more hydrophobic environment for the binding that dramatically increases the affinities for METH and AMP.

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Primary Citation of related structures
3GKZ