Myristylation of a duck hepatitis B virus envelope protein is essential for infectivity but not for virus assembly.
In addition to the major surface (S) protein, the envelope of the duck hepatitis B virus (DHBV) contains a related presurface (preS) protein whose N-terminus bears a covalently attached myristate group. We have explored the functional significance of this modification by examining the replicative potential of a mutant viral genome whose myristylation signal has been inactivated. Following transfection into permissive hepatoma cells, the mutant expresses an unmyristylated preS protein of normal size, immunoreactivity and stability. Cytoplasmic cores containing viral DNA are synthesized, and Dane particles are assembled and exported into the medium. However, the mutant is noninfectious when inoculated into susceptible ducklings. We conclude that myristylation of preS proteins is essential for hepadnaviral infectivity but not for viral assembly; myristylation is most likely required for an early step of the life cycle involving the entry or uncoating of virus particles.
Macrae
D R
DR
Department of Microbiology and Immunology, University of California Medical Center, San Francisco 94143.
Bruss
V
V
Ganem
D
D
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002478:Cells, Cultured; D003062:Codon / Q000235:genetics; D005814:Genes, Viral; D015611:Hepatitis B Virus, Duck / Q000235:genetics / Q000472:pathogenicity / Q000502:physiology*; D008969:Molecular Sequence Data; D016297:Mutagenesis, Site-Directed; D019814:Myristic Acid; D009227:Myristic Acids / Q000378:metabolism*; D015345:Oligonucleotide Probes; D011499:Protein Processing, Post-Translational; D014162:Transfection; D014759:Viral Envelope Proteins / Q000235:genetics*
D003062:Codon; D009227:Myristic Acids; D015345:Oligonucleotide Probes; D014759:Viral Envelope Proteins; D019814:Myristic Acid