ISDA: 6C3R

Deposition Date 2018-01-10

Release Date 2018-10-17

Last Version Date 2024-10-30

Entry Detail

PDB ID:

6C3R

Keywords:

VIRAL PROTEIN

Title:

Cricket paralysis virus RNAi suppressor protein CrPV-1A

Biological Source:

Source Organism:

Cricket paralysis virus (Taxon ID: 928300)

Host Organism:

Escherichia coli BL21(DE3)

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.60 Å

R-Value Free:

0.27

R-Value Work:

0.21

R-Value Observed:

0.22

Space Group:

P 21 21 21

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Macromolecular Entities

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Cricket paralysis virus 1A protein
Gene (Uniprot):ORF1
Chain IDs:A, B
Chain Length:141
Number of Molecules:2
Biological Source:Cricket paralysis virus

UniProt ID:Q9IJX4

Primary Citation

A Viral Protein Restricts Drosophila RNAi Immunity by Regulating Argonaute Activity and Stability.

Nayak, A, Kim, D.Y, Trnka, M.J, Kerr, C.H, Lidsky, P.V, Stanley, D.J, Rivera, B.M, Li, K.H, Burlingame, A.L, Jan, E, Frydman, J, Gross, J.D, Andino, R.Show

Cell Host Microbe 24 542 557.e9 (2018)

PMID: 30308158 DOI: 10.1016/j.chom.2018.09.006

Abstact

The dicistrovirus, Cricket paralysis virus (CrPV) encodes an RNA interference (RNAi) suppressor, 1A, which modulates viral virulence. Using the Drosophila model, we combined structural, biochemical, and virological approaches to elucidate the strategies by which CrPV-1A restricts RNAi immunity. The atomic resolution structure of CrPV-1A uncovered a flexible loop that interacts with Argonaute 2 (Ago-2), thereby inhibiting Ago-2 endonuclease-dependent immunity. Mutations disrupting Ago-2 binding attenuates viral pathogenesis in wild-type but not Ago-2-deficient flies. CrPV-1A also contains a BC-box motif that enables the virus to hijack a host Cul2-Rbx1-EloBC ubiquitin ligase complex, which promotes Ago-2 degradation and virus replication. Our study uncovers a viral-based dual regulatory program that restricts antiviral immunity by direct interaction with and modulation of host proteins. While the direct inhibition of Ago-2 activity provides an efficient mechanism to establish infection, the recruitment of a ubiquitin ligase complex enables CrPV-1A to amplify Ago-2 inactivation to restrict further antiviral RNAi immunity.

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