6P4B image
Entry Detail
PDB ID:
6P4B
Title:
HyHEL10 fab variant HyHEL10-4x (heavy chain mutations L4F, Y33H, S56N, and Y58F) bound to hen egg lysozyme variant HEL2x-flex (mutations R21Q, R73E, C76S, and C94S)
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2019-05-27
Release Date:
2020-05-27
Method Details:
Experimental Method:
Resolution:
1.90 Å
R-Value Free:
0.24
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Lysozyme C
Mutations:R21Q, R73E, C76S, C94S
Chain IDs:C, F (auth: D)
Chain Length:129
Number of Molecules:2
Biological Source:Gallus gallus
Polymer Type:polypeptide(L)
Description:HyHEL10 Fab heavy chain
Mutations:L4F, Y33H, S56N, Y58F
Chain IDs:B (auth: H), E (auth: B)
Chain Length:223
Number of Molecules:2
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Description:HyHEL10 Fab light chain
Chain IDs:A (auth: L), D (auth: A)
Chain Length:214
Number of Molecules:2
Biological Source:Mus musculus
Ligand Molecules
Primary Citation
Conformational diversity facilitates antibody mutation trajectories and discrimination between foreign and self-antigens.
Proc.Natl.Acad.Sci.USA 117 22341 22350 (2020)
PMID: 32855302 DOI: 10.1073/pnas.2005102117

Abstact

Conformational diversity and self-cross-reactivity of antigens have been correlated with evasion from neutralizing antibody responses. We utilized single cell B cell sequencing, biolayer interferometry and X-ray crystallography to trace mutation selection pathways where the antibody response must resolve cross-reactivity between foreign and self-proteins bearing near-identical contact surfaces, but differing in conformational flexibility. Recurring antibody mutation trajectories mediate long-range rearrangements of framework (FW) and complementarity determining regions (CDRs) that increase binding site conformational diversity. These antibody mutations decrease affinity for self-antigen 19-fold and increase foreign affinity 67-fold, to yield a more than 1,250-fold increase in binding discrimination. These results demonstrate how conformational diversity in antigen and antibody does not act as a barrier, as previously suggested, but rather facilitates high affinity and high discrimination between foreign and self.

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Primary Citation of related structures