Marked Variability in the Extent of Protein Disorder within and between Viral Families

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Title: Marked Variability in the Extent of Protein Disorder within and between Viral Families
Authors: Pushker, Ravindra
Mooney, Catherine
Davey, Norman E.
Jacqué, Jean-Marc
Shields, Denis C.
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Date: 19-Apr-2013
Online since: 2019-04-23T10:37:50Z
Abstract: Intrinsically disordered regions in eukaryotic proteomes contain key signaling and regulatory modules and mediate interactions with many proteins. Many viral proteomes encode disordered proteins and modulate host factors through the use of short linear motifs (SLiMs) embedded within disordered regions. However, the degree of viral protein disorder across different viruses is not well understood, so we set out to establish the constraints acting on viruses, in terms of their use of disordered protein regions. We surveyed predicted disorder across 2,278 available viral genomes in 41 families, and correlated the extent of disorder with genome size and other factors. Protein disorder varies strikingly between viral families (from 2.9% to 23.1% of residues), and also within families. However, this substantial variation did not follow the established trend among their hosts, with increasing disorder seen across eubacterial, archaebacterial, protists, and multicellular eukaryotes. For example, among large mammalian viruses, poxviruses and herpesviruses showed markedly differing disorder (5.6% and 17.9%, respectively). Viral families with smaller genome sizes have more disorder within each of five main viral types (ssDNA, dsDNA, ssRNA+, dsRNA, retroviruses), except for negative single-stranded RNA viruses, where disorder increased with genome size. However, surveying over all viruses, which compares tiny and enormous viruses over a much bigger range of genome sizes, there is no strong association of genome size with protein disorder. We conclude that there is extensive variation in the disorder content of viral proteomes. While a proportion of this may relate to base composition, to extent of gene overlap, and to genome size within viral types, there remain important additional family and virus-specific effects. Differing disorder strategies are likely to impact on how different viruses modulate host factors, and on how rapidly viruses can evolve novel instances of SLiMs subverting host functions, such as innate and acquired immunity.
Funding Details: Science Foundation Ireland
Type of material: Journal Article
Publisher: PLoS
Journal: PLoS ONE
Volume: 8
Issue: 4
Start page: e60724
Copyright (published version): 2013 the Authors
Keywords: Eukaryotic proteomesDisordered proteinsShort linear motifs (SLiMs)Viral protein disorderVirusesGenome sizeViral proteomesImmunity
DOI: 10.1371/journal.pone.0060724
Language: en
Status of Item: Peer reviewed
Appears in Collections:Conway Institute Research Collection
Conway Institute Research Collection
Computer Science Research Collection
Medicine Research Collection

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