Activation, exposure and penetration of virally encoded, membrane-active polypeptides during non-enveloped virus entry.

Abstract:

:Host cell entry by influenza and other enveloped viruses is well characterized, however, the manner in which non-enveloped viruses deliver their genome across host cell membranes in the absence of membrane fusion remains unresolved. The discovery of short, membrane altering, amphipathic or hydrophobic sequences in several non-enveloped virus capsid proteins such as the gamma (gamma) peptide of nodaviruses and tetraviruses, VP4 and the N-terminal region of VP1 of picornaviruses, micro1N of reoviruses, and protein VI of adenoviruses suggests that these small peptides facilitate breaching of the host membrane and the delivery of the viral genome into the host cell. In spite of conspicuous differences in entry among non-enveloped virions, the short stretches of membrane active regions are associated with similar, entry-related events including: I) proteolytic cleavage of a precursor capsid protein resulting in increased dynamic character and/or accessibility of these peptides; II) structural changes in the virus capsid triggered by receptor binding and/or low pH in entry compartments, resulting in peptide exposure; III) externalized peptides interact with host membranes and disrupt them, facilitating delivery of the viral genome inside the host cell. Here we discuss the membrane alteration activity in non-enveloped viruses with reference to the gamma peptide of nodaviruses. Virtually all of the characteristics of gamma are shared by analogous peptides in other non-enveloped viruses, making it a simple prototype for comparative purposes.

journal_name

Curr Protein Pept Sci

authors

Banerjee M,Johnson JE

doi

10.2174/138920308783565732

subject

Has Abstract

pub_date

2008-02-01 00:00:00

pages

16-27

issue

1

eissn

1389-2037

issn

1875-5550

journal_volume

9

pub_type

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