The signal sequence coding region promotes nuclear export of mRNA.

Abstract:

:In eukaryotic cells, most mRNAs are exported from the nucleus by the transcription export (TREX) complex, which is loaded onto mRNAs after their splicing and capping. We have studied in mammalian cells the nuclear export of mRNAs that code for secretory proteins, which are targeted to the endoplasmic reticulum membrane by hydrophobic signal sequences. The mRNAs were injected into the nucleus or synthesized from injected or transfected DNA, and their export was followed by fluorescent in situ hybridization. We made the surprising observation that the signal sequence coding region (SSCR) can serve as a nuclear export signal of an mRNA that lacks an intron or functional cap. Even the export of an intron-containing natural mRNA was enhanced by its SSCR. Like conventional export, the SSCR-dependent pathway required the factor TAP, but depletion of the TREX components had only moderate effects. The SSCR export signal appears to be characterized in vertebrates by a low content of adenines, as demonstrated by genome-wide sequence analysis and by the inhibitory effect of silent adenine mutations in SSCRs. The discovery of an SSCR-mediated pathway explains the previously noted amino acid bias in signal sequences and suggests a link between nuclear export and membrane targeting of mRNAs.

journal_name

PLoS Biol

journal_title

PLoS biology

authors

Palazzo AF,Springer M,Shibata Y,Lee CS,Dias AP,Rapoport TA

doi

10.1371/journal.pbio.0050322

subject

Has Abstract

pub_date

2007-12-01 00:00:00

pages

e322

issue

12

eissn

1544-9173

issn

1545-7885

pii

07-PLBI-RA-1314

journal_volume

5

pub_type

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