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Nature Research, Nature Communications, 1(6), 2015

DOI: 10.1038/ncomms7510

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Symportin 1 chaperones 5S RNP assembly during ribosome biogenesis by occupying an essential rRNA-binding site

Journal article published in 2015 by Fabiola R. Calviño, Satyavati Kharde, Alessandro Ori ORCID, Astrid Hendricks, Klemens Wild, Dieter Kressler ORCID, Gert Bange, Ed Hurt, Martin Beck ORCID, Irmgard Sinning
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

AbstractDuring 60S biogenesis, mature 5S RNP consisting of 5S RNA, RpL5 and RpL11, assembles into a pre-60S particle, where docking relies on RpL11 interacting with helix 84 (H84) of the 25S RNA. How 5S RNP is assembled for recruitment into the pre-60S is not known. Here we report the crystal structure of a ternary symportin Syo1–RpL5-N–RpL11 complex and provide biochemical and structural insights into 5S RNP assembly. Syo1 guards the 25S RNA-binding surface on RpL11 and competes with H84 for binding. Pull-down experiments show that H84 releases RpL11 from the ternary complex, but not in the presence of 5S RNA. Crosslinking mass spectrometry visualizes structural rearrangements on incorporation of 5S RNA into the Syo1–RpL5–RpL11 complex supporting the formation of a pre-5S RNP. Our data underline the dual role of Syo1 in ribosomal protein transport and as an assembly platform for 5S RNP.