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Updated: Mar 14, 2026

Identification of Nucleolar Factors During HIV-1 Replication Through Rev Immunoprecipitation and Mass Spectrometry
Published on: June 26, 2019
The Golgi associated ERI3 is a Flavivirus host factor.
Alex Michael Ward1, Meredith E K Calvert2, Leah R Read1
1Program in Emerging Infectious Diseases, Duke-NUS Graduate Medical School, Singapore.
Researchers identified ERI3, a Golgi protein, essential for Dengue virus type 2 (DENV-2) RNA replication in both human cells and Aedes aegypti mosquitoes. This discovery offers new therapeutic targets for Dengue fever.
Area of Science:
- Virology
- Molecular Biology
- Cell Biology
Background:
- Dengue virus (DENV) poses a significant global health threat, with no effective vaccines or therapeutics available.
- DENV infection can lead to severe conditions like Dengue hemorrhagic fever (DHF) and Dengue shock syndrome (DSS).
Purpose of the Study:
- To identify host RNA binding proteins (RBPs) that interact with DENV-2 RNA.
- To elucidate the role of identified RBPs in the DENV-2 life cycle.
Main Methods:
- RNA chromatography coupled with quantitative mass spectrometry (qMS) was used to identify DENV-2 RNA interacting proteins.
- Functional assays were performed in human cells and Aedes aegypti mosquitoes to assess the role of ERI3 in viral replication.
Main Results:
- ERI3 (also known as PRNPIP and PINT1), a putative RNA exonuclease, was identified as a DENV-2 interacting protein.
- ERI3 preferentially binds to DENV-2 genomic RNA via 3' UTR dumbbell structures.
- ERI3 is crucial for DENV-2 genomic RNA accumulation and infectious particle production.
- The mosquito homolog of ERI3 is also essential for DENV-2 replication in Aedes aegypti.
- ERI3 relocalizes to sites of DENV-2 replication in infected human cells and is required for viral RNA synthesis, not stability or translation.
Conclusions:
- ERI3 plays a critical, conserved role in DENV-2 RNA synthesis.
- The Golgi apparatus and its associated proteins are important for DENV-2 replication.
- ERI3 represents a potential therapeutic target for DENV infections.
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