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Dual interaction of the Hsp70 J-protein cochaperone Zuotin with the 40S and 60S ribosomal subunits

Journal Article · · Nature Structural & Molecular Biology
DOI:https://doi.org/10.1038/nsmb.3299· OSTI ID:1357642
Ribosome-associated J protein–Hsp70 chaperones promote nascent-polypeptide folding and normal translational fidelity. The J protein Zuo1 is known to span the ribosomal subunits, but understanding of its function is limited. Here, in this paper, we present new structural and cross-linking data allowing more precise positioning of Saccharomyces cerevisiae Zuo1 near the 60S polypeptide-exit site and suggesting interactions of Zuo1 with the ribosomal protein eL31 and 25S rRNA helix 24. The junction between the 60S-interacting and subunit-spanning helices is a hinge that positions Zuo1 on the 40S yet accommodates subunit rotation. Interaction between the Zuo1 C terminus and 40S occurs via 18S rRNA expansion segment 12 (ES12) of helix 44, which originates at the decoding site. Deletions in either ES12 or the Zuo1 C terminus alter readthrough of stop codons and –1 frameshifting. Our study offers insight into how this cotranslational chaperone system may monitor decoding-site activity and nascent-polypeptide transit, thereby coordinating protein translation and folding.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
National Cancer Institute (NCI); National Institute of General Medical Sciences (NIGMS); National Institutes of Health (NIH); USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1357642
Journal Information:
Nature Structural & Molecular Biology, Journal Name: Nature Structural & Molecular Biology Journal Issue: 11 Vol. 23; ISSN 1545-9993
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
ENGLISH

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Cited By (7)

The Hsp70 homolog Ssb affects ribosome biogenesis via the TORC1-Sch9 signaling pathway journal October 2017
Structure and evolution of the 4-helix bundle domain of Zuotin, a J-domain protein co-chaperone of Hsp70 journal May 2019
Structural insights into a unique Hsp70-Hsp40 interaction in the eukaryotic ribosome-associated complex journal January 2017
Two chaperones locked in an embrace: structure and function of the ribosome-associated complex RAC journal August 2017
The Hsp70 chaperone network journal June 2019
A dual role of the ribosome-bound chaperones RAC/Ssb in maintaining the fidelity of translation termination journal May 2019
Fluorescent polysome profiling reveals stress-mediated regulation of HSPA14-ribosome interactions posted_content March 2020

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