6QOZ image
Entry Detail
PDB ID:
6QOZ
EMDB ID:
Keywords:
Title:
CryoEM reconstruction of Cowpea Mosaic Virus (CPMV) bound to an Affimer reagent
Biological Source:
PDB Version:
Deposition Date:
2019-02-13
Release Date:
2019-12-18
Method Details:
Experimental Method:
Resolution:
3.40 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:RNA2 polyprotein
Chain IDs:A, C (auth: D), E (auth: F), G (auth: H)
Chain Length:189
Number of Molecules:4
Biological Source:Cowpea mosaic virus
Polymer Type:polypeptide(L)
Description:Cowpea mosaic virus large subunit
Chain IDs:B, D (auth: E), F (auth: G), H (auth: I)
Chain Length:369
Number of Molecules:4
Biological Source:Cowpea mosaic virus
Polymer Type:polypeptide(L)
Description:Affimer binding protein
Chain IDs:I (auth: C)
Chain Length:79
Number of Molecules:1
Biological Source:synthetic construct
Ligand Molecules
Primary Citation

Abstact

Plant viruses can cause devastating losses to agriculture and are therefore a major threat to food security. The rapid identification of virally-infected crops allowing containment is essential to limit such threats, but plant viral diseases can be extremely challenging to diagnose. An ideal method for plant virus diagnosis would be a device which can be implemented easily in the field. Such devices require a binding reagent that is specific for the virus of interest. We chose to investigate the use of Affimer reagents, artificial binding proteins and a model plant virus Cowpea Mosaic virus (CPMV) empty virus like particles (eVLPs). CPMV-eVLP mimic the morphology of wild-type (WT) CPMV but lack any infectious genomic material and so do not have biocontainment issues. We have produced and purified an Affimer reagent selected for its ability to bind to CPMV-eVLP and have shown that the selected Affimer also specifically binds to WT CPMV. We have produced a 3.4 Å structure of WT CPMV bound to the Affimer using cryo-electron microscopy. Finally, we have shown that this Affimer is capable of reliably detecting the virus in crude extracts of CPMV-infected leaves and can therefore form the basis for the future development of diagnostic tests.

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Protein

Chemical

Disease

Primary Citation of related structures