7RDR image
Entry Detail
PDB ID:
7RDR
EMDB ID:
Title:
Circular tandem repeat protein with novel repeat topology and enhanced subunit contact surfaces
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2021-07-10
Release Date:
2021-09-01
Method Details:
Experimental Method:
Resolution:
6.50 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Circular tendon repeat protein
Chain IDs:A, B, C
Chain Length:456
Number of Molecules:3
Biological Source:unidentified
Ligand Molecules
Primary Citation
Design of functionalised circular tandem repeat proteins with longer repeat topologies and enhanced subunit contact surfaces.
Commun Biol 4 1240 1240 (2021)
PMID: 34716407 DOI: 10.1038/s42003-021-02766-y

Abstact

Circular tandem repeat proteins ('cTRPs') are de novo designed protein scaffolds (in this and prior studies, based on antiparallel two-helix bundles) that contain repeated protein sequences and structural motifs and form closed circular structures. They can display significant stability and solubility, a wide range of sizes, and are useful as protein display particles for biotechnology applications. However, cTRPs also demonstrate inefficient self-assembly from smaller subunits. In this study, we describe a new generation of cTRPs, with longer repeats and increased interaction surfaces, which enhanced the self-assembly of two significantly different sizes of homotrimeric constructs. Finally, we demonstrated functionalization of these constructs with (1) a hexameric array of peptide-binding SH2 domains, and (2) a trimeric array of anti-SARS CoV-2 VHH domains. The latter proved capable of sub-nanomolar binding affinities towards the viral receptor binding domain and potent viral neutralization function.

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Primary Citation of related structures