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【题目】Giant viruses with an expandedcomplement of translation system components

【作者】Frederik Schulz1,*, Natalya Yutin2,Natalia N. Ivanova1 et al

【期刊】 Science

【日期】07 April 2017

【DOI】10.1126/science.aal4657

【摘要】The discovery of giant viruses blurredthe sharp division between viruses and cellular life. Giant virus genomesencode proteins considered as signatures of cellular organisms, particularlytranslation system components, prompting hypotheses that these viruses derivedfrom a fourth domain of cellular life. Here we report the discovery of a groupof giant viruses (Klosneuviruses) in metagenomic data. Compared with othergiant viruses, the Klosneuviruses encode an expanded translation machinery,including aminoacyl transfer RNA synthetases with specificities for all 20amino acids. Notwithstanding the prevalence of translation system components,comprehensive phylogenomic analysis of these genes indicates that Klosneuvirusesdid not evolve from a cellular ancestor but rather are derived from a muchsmaller virus through extensive gain of host genes.

【原文链接】http://science.sciencemag.org/content/356/6333/82

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