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Title: Ribosome-inactivation by a class of widely distributed C-tail anchored membrane proteins

Journal Article · · Structure
 [1];  [1];  [1];  [1];  [1];  [1];  [2]; ORCiD logo [1]
  1. Univ. of Freiburg (Germany)
  2. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Molecular Foundry; USDOE Joint Genome Institute (JGI), Berkeley, CA (United States)

Ribosome hibernation is a commonly used strategy that protects ribosomes under unfavorable conditions and regulates developmental processes. Multiple ribosome-hibernation factors have been identified in all domains of life, but due to their structural diversity and the lack of a common inactivation mechanism, it is currently unknown how many different hibernation factors exist. Here, we show that the YqjD/ElaB/YgaM paralogs, initially discovered as membrane-bound ribosome binding proteins in E. coli, constitute an abundant class of ribosome-hibernating proteins, which are conserved across all proteobacteria and some other bacterial phyla. Our data demonstrate that they inhibit in vitro protein synthesis by interacting with the 50S ribosomal subunit. In vivo cross-linking combined with mass spectrometry revealed their specific interactions with proteins surrounding the ribosomal tunnel exit and even their penetration into the ribosomal tunnel. Thus, YqjD/ElaB/YgaM inhibit translation by blocking the ribosomal tunnel and thus mimic the activity of antimicrobial peptides and macrolide antibiotics.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
German Research Foundation (DFG); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2472466
Journal Information:
Structure, Journal Name: Structure Journal Issue: 12 Vol. 32; ISSN 0969-2126
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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