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Human DDX3 functions in translation and interacts with the translation initiation factor eIF3
Chung-Sheng Lee1, Anusha P Dias, Mark Jedrychowski
1Department of Cell Biology, Harvard Medical School, 240 Longwood Ave., Boston, MA 02115, USA.
Nucleic Acids Research
|July 17, 2008
Summary
The RNA helicase DDX3 is crucial for cell viability and protein translation. This study reveals DDX3
Area of Science:
- Molecular Biology
- Cell Biology
- Virology
Background:
- The RNA helicase DDX3 is implicated in various cancers, HCV, and HIV.
- The precise cellular functions of DDX3 remain largely unknown despite its medical significance.
Purpose of the Study:
- To elucidate the cellular localization and function of the RNA helicase DDX3.
- To investigate DDX3's role in gene expression and protein synthesis.
Main Methods:
- Development of a novel antibody for DDX3 detection.
- Utilizing RNA interference (RNAi) in human and Drosophila cells.
- Analysis of DDX3 interactions with protein complexes.
Main Results:
- DDX3 is primarily localized in the cytoplasm.
- DDX3 is essential for cell viability and protein expression from reporter constructs.
- DDX3 interacts with the translation initiation factor eIF3.
Conclusions:
- DDX3 plays a critical role in protein translation, mediated by its interaction with eIF3.
- DDX3's function is primarily linked to cytoplasmic processes, particularly translation, rather than nuclear gene expression steps.
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