African swine fever virus protein p17 is essential for the progression of viral membrane precursors toward icosahedral intermediates.

Abstract:

:The first morphological evidence of African swine fever virus (ASFV) assembly is the appearance of precursor viral membranes, thought to derive from the endoplasmic reticulum, within the assembly sites. We have shown previously that protein p54, a viral structural integral membrane protein, is essential for the generation of the viral precursor membranes. In this report, we study the role of protein p17, an abundant transmembrane protein localized at the viral internal envelope, in these processes. Using an inducible virus for this protein, we show that p17 is essential for virus viability and that its repression blocks the proteolytic processing of polyproteins pp220 and pp62. Electron microscopy analyses demonstrate that when the infection occurs under restrictive conditions, viral morphogenesis is blocked at an early stage, immediately posterior to the formation of the viral precursor membranes, indicating that protein p17 is required to allow their progression toward icosahedral particles. Thus, the absence of this protein leads to an accumulation of these precursors and to the delocalization of the major components of the capsid and core shell domains. The study of ultrathin serial sections from cells infected with BA71V or the inducible virus under permissive conditions revealed the presence of large helicoidal structures from which immature particles are produced, suggesting that these helicoidal structures represent a previously undetected viral intermediate.

journal_name

J Virol

journal_title

Journal of virology

authors

Suárez C,Gutiérrez-Berzal J,Andrés G,Salas ML,Rodríguez JM

doi

10.1128/JVI.00600-10

subject

Has Abstract

pub_date

2010-08-01 00:00:00

pages

7484-99

issue

15

eissn

0022-538X

issn

1098-5514

pii

JVI.00600-10

journal_volume

84

pub_type

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