Poorly Conserved P15 Proteins of Cileviruses Retain Elements of Common Ancestry and Putative Functionality: A Theoretical Assessment on the Evolution of Cilevirus Genomes

The genus Cilevirus groups enveloped single-stranded (+) RNA virus members of the family Kitaviridae, order Martellivirales. Proteins P15, scarcely conserved polypeptides encoded by cileviruses, have no apparent homologs in public databases. Accordingly, the open reading frames (ORFs) p15, located a...

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Autores principales:	Pedro L. Ramos-González, Tirso Pons, Camila Chabi-Jesus, Gabriella Dias Arena, Juliana Freitas-Astua
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	Kitaviridae orphan ORF structure-based phylogenetic analysis synonymous codon usage bias horizontal gene transfer Dichorhavirus Plant culture SB1-1110
Acceso en línea:	https://doaj.org/article/dea69065e1364cbfaaba225d3204bee3
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spelling	oai:doaj.org-article:dea69065e1364cbfaaba225d3204bee32021-11-05T11:54:56ZPoorly Conserved P15 Proteins of Cileviruses Retain Elements of Common Ancestry and Putative Functionality: A Theoretical Assessment on the Evolution of Cilevirus Genomes1664-462X10.3389/fpls.2021.771983https://doaj.org/article/dea69065e1364cbfaaba225d3204bee32021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fpls.2021.771983/fullhttps://doaj.org/toc/1664-462XThe genus Cilevirus groups enveloped single-stranded (+) RNA virus members of the family Kitaviridae, order Martellivirales. Proteins P15, scarcely conserved polypeptides encoded by cileviruses, have no apparent homologs in public databases. Accordingly, the open reading frames (ORFs) p15, located at the 5′-end of the viral RNA2 molecules, are considered orphan genes (ORFans). In this study, we have delved into ORFs p15 and the relatively poorly understood biochemical properties of the proteins P15 to posit their importance for viruses across the genus and theorize on their origin. We detected that the ORFs p15 are under purifying selection and that, in some viral strains, the use of synonymous codons is biased, which might be a sign of adaptation to their plant hosts. Despite the high amino acid sequence divergence, proteins P15 show the conserved motif [FY]-L-x(3)-[FL]-H-x-x-[LIV]-S-C-x-C-x(2)-C-x-G-x-C, which occurs exclusively in members of this protein family. Proteins P15 also show a common predicted 3D structure that resembles the helical scaffold of the protein ORF49 encoded by radinoviruses and the phosphoprotein C-terminal domain of mononegavirids. Based on the 3D structural similarities of P15, we suggest elements of common ancestry, conserved functionality, and relevant amino acid residues. We conclude by postulating a plausible evolutionary trajectory of ORFans p15 and the 5′-end of the RNA2 of cileviruses considering both protein fold superpositions and comparative genomic analyses with the closest kitaviruses, negeviruses, nege/kita-like viruses, and unrelated viruses that share the ecological niches of cileviruses.Pedro L. Ramos-GonzálezTirso PonsCamila Chabi-JesusCamila Chabi-JesusGabriella Dias ArenaJuliana Freitas-AstuaJuliana Freitas-AstuaFrontiers Media S.A.articleKitaviridaeorphan ORFstructure-based phylogenetic analysissynonymous codon usage biashorizontal gene transferDichorhavirusPlant cultureSB1-1110ENFrontiers in Plant Science, Vol 12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Kitaviridae orphan ORF structure-based phylogenetic analysis synonymous codon usage bias horizontal gene transfer Dichorhavirus Plant culture SB1-1110
spellingShingle	Kitaviridae orphan ORF structure-based phylogenetic analysis synonymous codon usage bias horizontal gene transfer Dichorhavirus Plant culture SB1-1110 Pedro L. Ramos-González Tirso Pons Camila Chabi-Jesus Camila Chabi-Jesus Gabriella Dias Arena Juliana Freitas-Astua Juliana Freitas-Astua Poorly Conserved P15 Proteins of Cileviruses Retain Elements of Common Ancestry and Putative Functionality: A Theoretical Assessment on the Evolution of Cilevirus Genomes
description	The genus Cilevirus groups enveloped single-stranded (+) RNA virus members of the family Kitaviridae, order Martellivirales. Proteins P15, scarcely conserved polypeptides encoded by cileviruses, have no apparent homologs in public databases. Accordingly, the open reading frames (ORFs) p15, located at the 5′-end of the viral RNA2 molecules, are considered orphan genes (ORFans). In this study, we have delved into ORFs p15 and the relatively poorly understood biochemical properties of the proteins P15 to posit their importance for viruses across the genus and theorize on their origin. We detected that the ORFs p15 are under purifying selection and that, in some viral strains, the use of synonymous codons is biased, which might be a sign of adaptation to their plant hosts. Despite the high amino acid sequence divergence, proteins P15 show the conserved motif [FY]-L-x(3)-[FL]-H-x-x-[LIV]-S-C-x-C-x(2)-C-x-G-x-C, which occurs exclusively in members of this protein family. Proteins P15 also show a common predicted 3D structure that resembles the helical scaffold of the protein ORF49 encoded by radinoviruses and the phosphoprotein C-terminal domain of mononegavirids. Based on the 3D structural similarities of P15, we suggest elements of common ancestry, conserved functionality, and relevant amino acid residues. We conclude by postulating a plausible evolutionary trajectory of ORFans p15 and the 5′-end of the RNA2 of cileviruses considering both protein fold superpositions and comparative genomic analyses with the closest kitaviruses, negeviruses, nege/kita-like viruses, and unrelated viruses that share the ecological niches of cileviruses.
format	article
author	Pedro L. Ramos-González Tirso Pons Camila Chabi-Jesus Camila Chabi-Jesus Gabriella Dias Arena Juliana Freitas-Astua Juliana Freitas-Astua
author_facet	Pedro L. Ramos-González Tirso Pons Camila Chabi-Jesus Camila Chabi-Jesus Gabriella Dias Arena Juliana Freitas-Astua Juliana Freitas-Astua
author_sort	Pedro L. Ramos-González
title	Poorly Conserved P15 Proteins of Cileviruses Retain Elements of Common Ancestry and Putative Functionality: A Theoretical Assessment on the Evolution of Cilevirus Genomes
title_short	Poorly Conserved P15 Proteins of Cileviruses Retain Elements of Common Ancestry and Putative Functionality: A Theoretical Assessment on the Evolution of Cilevirus Genomes
title_full	Poorly Conserved P15 Proteins of Cileviruses Retain Elements of Common Ancestry and Putative Functionality: A Theoretical Assessment on the Evolution of Cilevirus Genomes
title_fullStr	Poorly Conserved P15 Proteins of Cileviruses Retain Elements of Common Ancestry and Putative Functionality: A Theoretical Assessment on the Evolution of Cilevirus Genomes
title_full_unstemmed	Poorly Conserved P15 Proteins of Cileviruses Retain Elements of Common Ancestry and Putative Functionality: A Theoretical Assessment on the Evolution of Cilevirus Genomes
title_sort	poorly conserved p15 proteins of cileviruses retain elements of common ancestry and putative functionality: a theoretical assessment on the evolution of cilevirus genomes
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/dea69065e1364cbfaaba225d3204bee3
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Poorly Conserved P15 Proteins of Cileviruses Retain Elements of Common Ancestry and Putative Functionality: A Theoretical Assessment on the Evolution of Cilevirus Genomes

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