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Molecular virology of the hepatitis C virus.

Abstract：

:Infection with the hepatitis C virus (HCV) is the major cause of nonA-nonB hepatitis worldwide. Although this virus cannot be cultivated in vitro, several of its key features have been elucidated in the past few years. The viral genome is a positive-sense, single-stranded, 9.6 kb long RNA molecule. The viral genome is translated into a single polyprotein of about 3000 amino acids. The viral polyprotein is proteolytically processed by the combination of cellular and viral proteinases in order to yield all the mature viral gene products. The genomic order of HCV has been shown to be C-E1-E2-p7-NS2-NS3-NS4A-NS4B-NS5A-NS5B. C, E1 and E2 are the virion.structural proteins. The function of p7 is currently unknown. These proteins have been shown to arise from the viral polyprotein via proteolytic processing by the host signal peptidases. Generation of the mature nonstructural proteins, NS2 to NS5B, relies on the activity of viral proteinases. Cleavage at the NS2/NS3 junction is accomplished by a metal-dependent autocatalytic proteinase encoded within NS2 and the N-terminus of NS3. The remaining cleavages downstream from this site are effected by a serine proteinase also contained within the N-terminal region of NS3. NS3 also contains an RNA helicase domain at its C-terminus. NS3 forms a heterodimeric complex with NS4A. The latter is a membrane protein that has been shown to act as a cofactor of the proteinase. While no function has yet been attributed to NS4B, it has recently been suggested that NS5A is involved in mediating the resistance of the hepatitis C virus to the action of interferon. Finally, the NS5B protein has been shown to be the viral RNA-dependent RNA polymerase.

journal_name

J Hepatol

journal_title

Journal of hepatology

authors

De Francesco R

doi

10.1016/s0168-8278(99)80374-2

subject

Has Abstract

pub_date

1999-01-01 00:00:00

pages

47-53

eissn

0168-8278

issn

1600-0641

pii

S0168-8278(99)80374-2

journal_volume

31 Suppl 1

pub_type

杂志文章,评审

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