7JH5 image
Entry Detail
PDB ID:
7JH5
Keywords:
Title:
Co-LOCKR: de novo designed protein switch
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2020-07-20
Release Date:
2020-09-02
Method Details:
Experimental Method:
Resolution:
2.10 Å
R-Value Free:
0.28
R-Value Work:
0.25
R-Value Observed:
0.25
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Co-LOCKR: de novo designed protein switch
Chain IDs:A, B
Chain Length:291
Number of Molecules:2
Biological Source:synthetic construct
Primary Citation
Designed protein logic to target cells with precise combinations of surface antigens.
Science 369 1637 1643 (2020)
PMID: 32820060 DOI: 10.1126/science.aba6527

Abstact

Precise cell targeting is challenging because most mammalian cell types lack a single surface marker that distinguishes them from other cells. A solution would be to target cells using specific combinations of proteins present on their surfaces. In this study, we design colocalization-dependent protein switches (Co-LOCKR) that perform AND, OR, and NOT Boolean logic operations. These switches activate through a conformational change only when all conditions are met, generating rapid, transcription-independent responses at single-cell resolution within complex cell populations. We implement AND gates to redirect T cell specificity against tumor cells expressing two surface antigens while avoiding off-target recognition of single-antigen cells, and three-input switches that add NOT or OR logic to avoid or include cells expressing a third antigen. Thus, de novo designed proteins can perform computations on the surface of cells, integrating multiple distinct binding interactions into a single output.

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