8TS5 image
Entry Detail
PDB ID:
8TS5
Title:
Structure of the apo FabS1C_C1
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2023-08-10
Release Date:
2023-11-22
Method Details:
Experimental Method:
Resolution:
2.10 Å
R-Value Free:
0.26
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:S1C variant of Fab C1 heavy chain
Chain IDs:A, C (auth: B)
Chain Length:223
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:S1C variant of Fab C1 light chain
Mutations:SPHAGLSSP replaced by QGTTS; Q165S, K167Y
Chain IDs:B (auth: G), D (auth: C)
Chain Length:215
Number of Molecules:2
Biological Source:Homo sapiens
Primary Citation
Engineered antigen-binding fragments for enhanced crystallization of antibody:antigen complexes.
Protein Sci. 33 e4824 e4824 (2024)
PMID: 37945533 DOI: 10.1002/pro.4824

Abstact

The atomic-resolution structural information that X-ray crystallography can provide on the binding interface between a Fab and its cognate antigen is highly valuable for understanding the mechanism of interaction. However, many Fab:antigen complexes are recalcitrant to crystallization, making the endeavor a considerable effort with no guarantee of success. Consequently, there have been significant steps taken to increase the likelihood of Fab:antigen complex crystallization by altering the Fab framework. In this investigation, we applied the surface entropy reduction strategy coupled with phage-display technology to identify a set of surface substitutions that improve the propensity of a human Fab framework to crystallize. In addition, we showed that combining these surface substitutions with previously reported Crystal Kappa and elbow substitutions results in an extraordinary improvement in Fab and Fab:antigen complex crystallizability, revealing a strong synergistic relationship between these sets of substitutions. Through comprehensive Fab and Fab:antigen complex crystallization screenings followed by structure determination and analysis, we defined the roles that each of these substitutions play in facilitating crystallization and how they complement each other in the process.

Legend

Protein

Chemical

Disease

Primary Citation of related structures