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Reverse genetics-based biochemical studies of the ribosomal exit tunnel constriction region in eukaryotic ribosome stalling: spatial allocation of the regulatory nascent peptide at the constriction.

Abstract：

:A number of regulatory nascent peptides have been shown to regulate gene expression by causing programmed ribosome stalling during translation. Nascent peptide emerges from the ribosome through the exit tunnel, and one-third of the way along which β-loop structures of ribosomal proteins uL4 and uL22 protrude into the tunnel to form the constriction region. Structural studies have shown interactions between nascent peptides and the exit tunnel components including the constriction region. In eukaryotes, however, there is a lack of genetic studies for the involvement of the constriction region in ribosome stalling. Here, we established transgenic Arabidopsis lines that carry mutations in the β-loop structure of uL4. Translation analyses using a cell-free translation system derived from the transgenic Arabidopsis carrying the mutant ribosome showed that the uL4 mutations reduced the ribosome stalling of four eukaryotic stalling systems, including those for which stalled structures have been solved. Our data, which showed differential effects of the uL4 mutations depending on the stalling systems, explained the spatial allocations of the nascent peptides at the constriction that were deduced by structural studies. Conversely, our data may predict allocation of the nascent peptide at the constriction of stalling systems for which structural studies are not done.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Takamatsu S,Ohashi Y,Onoue N,Tajima Y,Imamichi T,Yonezawa S,Morimoto K,Onouchi H,Yamashita Y,Naito S

doi

10.1093/nar/gkz1190

subject

Has Abstract

pub_date

2020-02-28 00:00:00

pages

1985-1999

issue

4

eissn

0305-1048

issn

1362-4962

pii

5686797

journal_volume

48

pub_type

杂志文章

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