Related Experiment Videos
Proteolytic processing of the hepatitis B virus e antigen precursor. Cleavage at two furin consensus sequences
Fabienne Messageot1, Samia Salhi, Patricia Eon
1Laboratoire de Génétique des Virus, Gif sur Yvette, 91198 France.
The Journal of Biological Chemistry
|November 6, 2002
Summary
Hepatitis B virus P22 protein maturation into e antigen (HBeAg) involves protease cleavage. Furin likely mediates this process, and HBeAg is 164 amino acids, not 159.
Area of Science:
- Virology
- Molecular Biology
- Biochemistry
Background:
- Hepatitis B virus (HBV) P22 protein is a precursor to secreted e antigen (HBeAg).
- HBeAg maturation involves C-terminal processing by proprotein convertases.
Purpose of the Study:
- To investigate the cleavage sites and steps in P22 protein maturation.
- To identify the specific protease involved in HBeAg generation.
- To determine the precise length of mature HBeAg.
Main Methods:
- Protease cleavage assays on P22 protein.
- Analysis of processing intermediates and cleavage sites.
- Localization studies of C-terminal processing.
Main Results:
- P22 cleavage occurs at Arg(167) or Arg(154) C-terminal sites.
- Maturation can be one-step or two-step, generating a P20 intermediate.
- C-terminal processing occurs in the trans-Golgi network and post-exocytosis.
- Furin is implicated in HBeAg maturation based on cleavage site characteristics.
- Mature HBeAg is 164 amino acids in this experimental system.
Conclusions:
- Furin is a key enzyme in Hepatitis B virus e antigen maturation.
- The maturation process of P22 protein is complex and can occur extracellularly.
- The size of mature HBeAg is confirmed as 164 amino acids.