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J Virol, May 1998, p. 3827-3836, Vol. 72, No. 5
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Hepatitis C Virus Structural Proteins Assemble
into Viruslike Particles in Insect Cells
Thomas F.
Baumert,1
Susumu
Ito,2
David T.
Wong,3 and
T. Jake
Liang1,*
Liver Diseases Section, National Institute of
Diabetes and Digestive and Kidney Diseases, National Institutes of
Health, Bethesda, Maryland 208921;
Department of Neurobiology and Department of Cell Biology,
Harvard Medical School, Boston, Massachusetts
021152; and
Division of
Gastroenterology, Department of Medicine, Stanford University
School of Medicine, Palo Alto, California 943043
Received 30 December 1997/Accepted 20 January 1998
Hepatitis C virus (HCV) is a leading cause of chronic hepatitis in
the world. The study of HCV has been hampered by the low level of viral
particles in infected individuals, the inability to propagate
efficiently the virus in cultured cells, and the lack of a convenient
animal model. Due to these obstacles, neither the structure of the
virus nor the prerequisites for its assembly have been clearly defined.
In this report, we describe a model for the production and purification
of HCV-like particles in insect cells using a recombinant baculovirus
containing the cDNA of the HCV structural proteins. In insect cells,
expressed HCV structural proteins assembled into enveloped viruslike
particles (40 to 60 nm in diameter) in large cytoplasmic cisternae,
presumably derived from the endoplasmic reticulum. Biophysical
characterization of viruslike particles by CsCl and sucrose gradient
centrifugation revealed biophysical properties similar to those of
putative virions isolated from infected humans. The results suggested
that HCV core and envelope proteins without p7 were sufficient for
viral particle formation. Analysis of particle-associated nucleic acids demonstrated that HCV RNAs were selectively incorporated into the
particles over non-HCV transcripts. The synthesis of HCV-like particles
in insect cells may provide an important tool to determine the
structural requirements for HCV particle assembly as well as to study
viral genome encapsidation and virus-host interactions. The described
system may also represent a potential approach toward vaccine
development.
*
Corresponding author. Mailing address: Liver Diseases
Section, NIDDK, National Institutes of Health, 10 Center Dr., Rm. 9B16, Bethesda, MD 20892-1800. Phone: (301) 496-1721. Fax: (301) 402-0491. E-mail: JLiang{at}nih.gov.
J Virol, May 1998, p. 3827-3836, Vol. 72, No. 5
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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