Identification and structural analysis of the Schizosaccharomyces pombe SMN complex.

Autor:	Veepaschit J; Department of Biochemistry, Biocenter, University of Würzburg, Würzburg 97074, Germany., Viswanathan A; Department of Biochemistry, Biocenter, University of Würzburg, Würzburg 97074, Germany., Bordonné R; Institut de Génétique Moléculaire de Montpellier, University of Montpellier, CNRS, Montpellier 34293, France., Grimm C; Department of Biochemistry, Biocenter, University of Würzburg, Würzburg 97074, Germany., Fischer U; Department of Biochemistry, Biocenter, University of Würzburg, Würzburg 97074, Germany.
Jazyk:	angličtina
Zdroj:	Nucleic acids research [Nucleic Acids Res] 2021 Jul 21; Vol. 49 (13), pp. 7207-7223.
DOI:	10.1093/nar/gkab158
Abstrakt:	The macromolecular SMN complex facilitates the formation of Sm-class ribonucleoproteins involved in mRNA processing (UsnRNPs). While biochemical studies have revealed key activities of the SMN complex, its structural investigation is lagging behind. Here we report on the identification and structural determination of the SMN complex from the lower eukaryote Schizosaccharomyces pombe, consisting of SMN, Gemin2, 6, 7, 8 and Sm proteins. The core of the SMN complex is formed by several copies of SMN tethered through its C-terminal alpha-helices arranged with alternating polarity. This creates a central platform onto which Gemin8 binds and recruits Gemins 6 and 7. The N-terminal parts of the SMN molecules extrude via flexible linkers from the core and enable binding of Gemin2 and Sm proteins. Our data identify the SMN complex as a multivalent hub where Sm proteins are collected in its periphery to allow their joining with UsnRNA. (© The Author(s) 2021. Published by Oxford University Press on behalf of Nucleic Acids Research.)
Databáze:	MEDLINE
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