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Molecular basis for protection of ribosomal protein L4 from cellular degradation

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms14354· OSTI ID:1623872
 [1];  [2]
  1. California Institute of Technology (CalTech), Pasadena, CA (United States). Division of Chemistry and Chemical Engineering; DOE/OSTI
  2. California Institute of Technology (CalTech), Pasadena, CA (United States). Division of Chemistry and Chemical Engineering
Eukaryotic ribosome biogenesis requires the nuclear import of B80 nascent ribosomal proteins and the elimination of excess amounts by the cellular degradation machinery. Assembly chaperones recognize nascent unassembled ribosomal proteins and transport them together with karyopherins to their nuclear destination. We report the crystal structure of ribosomal protein L4 (RpL4) bound to its dedicated assembly chaperone of L4 (Acl4), revealing extensive interactions sequestering 70 exposed residues of the extended RpL4 loop. The observed molecular recognition fundamentally differs from canonical promiscuous chaperone–substrate interactions. We demonstrate that the eukaryote-specific RpL4 extension harbours overlapping binding sites for Acl4 and the nuclear transport factor Kap104, facilitating its continuous protection from the cellular degradation machinery. Thus, Acl4 serves a dual function to facilitate nuclear import and simultaneously protect unassembled RpL4 from the cellular degradation machinery.
Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1623872
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 8; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (11)

Ribosomal protein L14 contributes to the early assembly of 60S ribosomal subunits in Saccharomyces cerevisiae journal February 2018
Placeholder factors in ribosome biogenesis: please, pave my way journal May 2017
The molecular mechanism for nuclear transport and its application journal January 2017
Eukaryotic ribosome assembly, transport and quality control journal September 2017
Molecular basis for disassembly of an importin:ribosomal protein complex by the escortin Tsr2 journal September 2018
Tsr4 and Nap1, two novel members of the ribosomal protein chaperOME journal May 2019
Dimerization of human Rio2 kinase/ATPase locks its ATP-binding site in an apo state journal August 2019
Tsr4 is a cytoplasmic chaperone for the ribosomal protein Rps2 in Saccharomyces cerevisiae journal February 2019
AstroDot: a new method for studying the spatial distribution of mRNA in astrocytes journal September 2019
Tsr4 Is a Cytoplasmic Chaperone for the Ribosomal Protein Rps2 in Saccharomyces cerevisiae journal June 2019
Molecular basis for disassembly of an importin:ribosomal protein complex by the escortin Tsr2 text January 2018

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