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The evolutionary and functional diversity of classical and lesser-known cytoplasmic and organellar translational GTPases across the tree of life
Umeå University, Faculty of Medicine, Department of Molecular Biology (Faculty of Medicine). Umeå University, Faculty of Medicine, Molecular Infection Medicine Sweden (MIMS). Institute of Technology, University of Tartu, Nooruse 1, Tartu, 50411, Estonia.
2015 (English)In: BMC Genomics, ISSN 1471-2164, Vol. 16, 78Article in journal (Refereed) Published
Abstract [en]

Background: The ribosome translates mRNA to protein with the aid of a number of accessory protein factors. Translational GTPases (trGTPases) are an integral part of the 'core set' of essential translational factors, and are some of the most conserved proteins across life. This study takes advantage of the wealth of available genomic data, along with novel functional information that has come to light for a number of trGTPases to address the full evolutionary and functional diversity of this superfamily across all domains of life. 

Results: Through sensitive sequence searching combined with phylogenetic analysis, 57 distinct subfamilies of trGTPases are identified: 14 bacterial, 7 archaeal and 35 eukaryotic (of which 21 are known or predicted to be organellar). The results uncover the functional evolution of trGTPases from before the last common ancestor of life on earth to the current day. 

Conclusions: While some trGTPases are universal, others are limited to certain taxa, suggesting lineage-specific translational control mechanisms that exist on a base of core factors. These lineage-specific features may give organisms the ability to tune their translation machinery to respond to their environment. Only a fraction of the diversity of the trGTPase superfamily has been subjected to experimental analyses; this comprehensive classification brings to light novel and overlooked translation factors that are worthy of further investigation.

Place, publisher, year, edition, pages
2015. Vol. 16, 78
Keyword [en]
Ribosome, GTPase, trGTPase, Translation, Molecular evolution, LUCA, EF1, EF2, IF2
National Category
Biochemistry and Molecular Biology
URN: urn:nbn:se:umu:diva-101403DOI: 10.1186/s12864-015-1289-7ISI: 000350162600002PubMedID: 25756599OAI: diva2:839355
Available from: 2015-07-02 Created: 2015-03-30 Last updated: 2015-07-02Bibliographically approved

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Atkinson, Gemma Catherine
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