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Structure and function of the yeast listerin (Ltn1) conserved N-terminal domain in binding to stalled 60S ribosomal subunits

The Ltn1 E3 ligase (listerin in mammals) has emerged as a paradigm for understanding ribosome-associated ubiquitylation. Ltn1 binds to 60S ribosomal subunits to ubiquitylate nascent polypeptides that become stalled during synthesis; among Ltn1’s substrates are aberrant products of mRNA lacking stop...

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Hauptverfasser: Doamekpor, Selom (VerfasserIn) , Lee, Joong-Won (VerfasserIn) , Hepowit, Nathaniel L. (VerfasserIn) , Wu, Cheng (VerfasserIn) , Charenton, Clement (VerfasserIn) , Leonard, Marilyn (VerfasserIn) , Bengtson, Mario H. (VerfasserIn) , Rajashankar, Kanagalaghatta R. (VerfasserIn) , Sachs, Matthew S. (VerfasserIn) , Lima, Christopher D. (VerfasserIn) , Joazeiro, Claudio A. P. (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: May 25, 2016
In: Proceedings of the National Academy of Sciences of the United States of America
Year: 2016, Jahrgang: 113, Heft: 29, Pages: E4151-E4160
ISSN:1091-6490
DOI:10.1073/pnas.1605951113
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1073/pnas.1605951113
Verlag, lizenzpflichtig, Volltext: https://www.pnas.org/content/113/29/E4151
Volltext
Verfasserangaben:Selom K. Doamekpor, Joong-Won Lee, Nathaniel L. Hepowit, Cheng Wu, Clement Charenton, Marilyn Leonard, Mario H. Bengtson, Kanagalaghatta R. Rajashankar, Matthew S. Sachs, Christopher D. Lima, and Claudio A.P. Joazeiro
Beschreibung
Zusammenfassung:The Ltn1 E3 ligase (listerin in mammals) has emerged as a paradigm for understanding ribosome-associated ubiquitylation. Ltn1 binds to 60S ribosomal subunits to ubiquitylate nascent polypeptides that become stalled during synthesis; among Ltn1’s substrates are aberrant products of mRNA lacking stop codons [nonstop translation products (NSPs)]. Here, we report the reconstitution of NSP ubiquitylation in Neurospora crassa cell extracts. Upon translation in vitro, ribosome-stalled NSPs were ubiquitylated in an Ltn1-dependent manner, while still ribosome-associated. Furthermore, we provide biochemical evidence that the conserved N-terminal domain (NTD) plays a significant role in the binding of Ltn1 to 60S ribosomal subunits and that NTD mutations causing defective 60S binding also lead to defective NSP ubiquitylation, without affecting Ltn1’s intrinsic E3 ligase activity. Finally, we report the crystal structure of the Ltn1 NTD at 2.4-Å resolution. The structure, combined with additional mutational studies, provides insight to NTD’s role in binding stalled 60S subunits. Our findings show that Neurospora extracts can be used as a tool to dissect mechanisms underlying ribosome-associated protein quality control and are consistent with a model in which Ltn1 uses 60S subunits as adapters, at least in part via its NTD, to target stalled NSPs for ubiquitylation.
Beschreibung:Gesehen am 11.05.2020
Beschreibung:Online Resource
ISSN:1091-6490
DOI:10.1073/pnas.1605951113

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