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Hypermethylated-capped selenoprotein mRNAs in mammals.

Abstract：

:Mammalian mRNAs are generated by complex and coordinated biogenesis pathways and acquire 5'-end m(7)G caps that play fundamental roles in processing and translation. Here we show that several selenoprotein mRNAs are not recognized efficiently by translation initiation factor eIF4E because they bear a hypermethylated cap. This cap modification is acquired via a 5'-end maturation pathway similar to that of the small nucle(ol)ar RNAs (sn- and snoRNAs). Our findings also establish that the trimethylguanosine synthase 1 (Tgs1) interacts with selenoprotein mRNAs for cap hypermethylation and that assembly chaperones and core proteins devoted to sn- and snoRNP maturation contribute to recruiting Tgs1 to selenoprotein mRNPs. We further demonstrate that the hypermethylated-capped selenoprotein mRNAs localize to the cytoplasm, are associated with polysomes and thus translated. Moreover, we found that the activity of Tgs1, but not of eIF4E, is required for the synthesis of the GPx1 selenoprotein in vivo.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Wurth L,Gribling-Burrer AS,Verheggen C,Leichter M,Takeuchi A,Baudrey S,Martin F,Krol A,Bertrand E,Allmang C

doi

10.1093/nar/gku580

subject

Has Abstract

pub_date

2014-07-01 00:00:00

pages

8663-77

issue

13

eissn

0305-1048

issn

1362-4962

pii

gku580

journal_volume

42

pub_type

杂志文章

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