7DC7 image
Entry Detail
PDB ID:
7DC7
Keywords:
Title:
Crystal structure of D12 Fab-ATP complex
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2020-10-23
Release Date:
2021-01-13
Method Details:
Experimental Method:
Resolution:
1.77 Å
R-Value Free:
0.21
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:D12 Fab heavy chain
Chain IDs:A
Chain Length:227
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:D12 Fab light chain
Chain IDs:B
Chain Length:216
Number of Molecules:1
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation

Abstact

The extracellular adenosine triphosphate (ATP) concentration is highly elevated in the tumor microenvironment (TME) and remains tightly regulated in normal tissues. Using phage display technology, we establish a method to identify an antibody that can bind to an antigen only in the presence of ATP. Crystallography analysis reveals that ATP bound in between the antibody-antigen interface serves as a switch for antigen binding. In a transgenic mouse model overexpressing the antigen systemically, the ATP switch antibody binds to the antigen in tumors with minimal binding in normal tissues and plasma and inhibits tumor growth. Thus, we demonstrate that elevated extracellular ATP concentration can be exploited to specifically target the TME, giving therapeutic antibodies the ability to overcome on-target off-tumor toxicity.

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Primary Citation of related structures