Tomato spotted wilt virus glycoprotein G(C) is cleaved at acidic pH.

Abstract:

:Tomato spotted wilt virus (TSWV) is a plant-infecting member of the family Bunyaviridae. TSWV encodes two envelope glycoproteins, G(N) and G(C), which are required for virus infection of the arthropod vector. Other members of the Bunyaviridae enter host cells by pH-dependent endocytosis. During this process, the glycoproteins are exposed to conditions of acidic pH within endocytic vesicles causing the G(C) protein to change conformation. This conformational change renders G(C) more sensitive to protease cleavage. We subjected TSWV virions to varying pH conditions and determined that TSWV G(C), but not G(N), was cleaved under acidic pH conditions, and that this phenomenon did not occur at neutral or alkaline pH. This data provides evidence that G(C) changes conformation at low pH which results in altered protease sensitivity. Furthermore, sequence analysis of G(C) predicts the presence of internal hydrophobic domains, regions that are characteristic of fusion proteins. Like studies with other members of the Bunyaviridae, this study is the first step towards characterizing the nature of cell entry by TSWV.

journal_name

Virus Res

journal_title

Virus research

authors

Whitfield AE,Ullman DE,German TL

doi

10.1016/j.virusres.2005.01.007

subject

Has Abstract

pub_date

2005-06-01 00:00:00

pages

183-6

issue

1-2

eissn

0168-1702

issn

1872-7492

pii

S0168-1702(05)00038-9

journal_volume

110

pub_type

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