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Updated: May 11, 2026
13:02
Production, Crystallization, and Structure Determination of the IKK-binding Domain of NEMO
Published on: December 28, 2019
Polydnavirus Ank proteins bind NF-κB homodimers and inhibit processing of Relish
Kavita Bitra1, Richard J Suderman, Michael R Strand
1Department of Entomology, University of Georgia, Athens, Georgia, USA.
Plos Pathogens
|June 2, 2012
Summary
Insect viruses use ank proteins to mimic inhibitor-kappaB (IκB), effectively suppressing the insect
Area of Science:
- Insect immunology
- Molecular biology
- Virology
Background:
- Insect immune responses are regulated by Nuclear Factor-κB (NF-κB) pathways involving Rel and inhibitor κB (IκB) proteins.
- Parasitoid wasps utilize polydnaviruses (PDVs) to suppress insect immunity, often encoding ank genes with IκB-like features.
Purpose of the Study:
- To quantitatively compare the binding affinities of viral IκB mimics (Ank-H4, Ank-N5) with insect Rel proteins against endogenous IκBs.
- To investigate the functional impact of these viral mimics on NF-κB signaling and antimicrobial peptide gene expression.
Main Methods:
- Surface plasmon resonance (SPR) assays to measure binding affinities.
- Co-immunoprecipitation assays to assess protein interactions.
- Analysis of Relish processing and antimicrobial peptide gene expression in insect cells and hosts.
Main Results:
- Viral Ank-H4 and Ank-N5 exhibit higher binding affinities to insect Rel proteins (Dif, Dorsal, Relish) than endogenous IκB domains.
- Ank-H4 and Ank-N5 inhibit Relish processing and reduce antimicrobial peptide gene expression.
- MdBV (Microplitis demolitor bracovirus) inhibits NF-κB signaling in the natural host.
Conclusions:
- Viral IκB mimics demonstrate potent inhibition of insect NF-κB pathways.
- This study provides the first quantitative binding affinities for insect and viral IκB interactions.
- Viral mimics effectively disable Relish processing, highlighting a key pathogen immune evasion strategy.
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