Related Experiment Videos
Regulated processing of hepatitis C virus core protein is linked to subcellular localization
1Laboratory of Virology and Parasitology, The Lindsley F. Kimball Research Institute of the New York Blood Center, New York, New York 10021, USA.
Journal of Virology
|January 1, 1997
Summary
Mutations in hepatitis C virus (HCV) core protein affect its maturation and localization. Specific residues are critical for processing, influencing viral assembly and biological functions.
Area of Science:
- Virology
- Molecular Biology
- Cell Biology
Background:
- Posttranslational processing and subcellular localization of the hepatitis C virus (HCV) core protein are crucial for viral assembly.
- Understanding these processes is key to developing antiviral strategies.
Purpose of the Study:
- To investigate the role of specific amino acid residues in HCV core protein processing and localization.
- To elucidate the mechanisms governing HCV core protein maturation and its impact on viral assembly.
Main Methods:
- In vitro translation and transient COS-1 cell transfection of core protein expression constructs.
- Site-directed mutagenesis to identify critical residues.
- Immunoblotting and indirect immunofluorescence assays to detect protein forms and localization.
Main Results:
- Mutations at residues 173-174 and 191-192 disrupted HCV core protein maturation at putative cleavage sites.
- Two core protein forms, C173 and C191, were detected.
- Both C173 and C191 showed cytoplasmic localization when produced from full-length HCV protein or precursors.
- C173 translocated to the nucleus when expressed without C191.
Conclusions:
- Specific residues are implicated in HCV core protein maturation pathway.
- Preferential cleavage and association between C191 and C173 species influence core protein subcellular distribution.
- This mechanism may control diverse biological functions of core protein during HCV replication and assembly.