Click here to close Hello! We notice that you are using Internet Explorer, which is not supported by Xenbase and may cause the site to display incorrectly. We suggest using a current version of Chrome, FireFox, or Safari.
XB-ART-13801
EMBO J 1998 Dec 15;1724:7430-41. doi: 10.1093/emboj/17.24.7430.
Show Gene links Show Anatomy links

The role of exportin-t in selective nuclear export of mature tRNAs.

Arts GJ , Kuersten S , Romby P , Ehresmann B , Mattaj IW .


Abstract
Exportin-t (Xpo-t) is a vertebrate nuclear export receptor for tRNAs that binds tRNA cooperatively with GTP-loaded Ran. Xpo-t antibodies are shown to efficiently block tRNA export from Xenopus oocyte nuclei suggesting that it is responsible for at least the majority of tRNA export in these cells. We examine the mechanism by which Xpo-t-RanGTP specifically exports mature tRNAs rather than other forms of nuclear RNA, including tRNA precursors. Chemical and enzymatic footprinting together with phosphate modification interference reveals an extensive interaction between the backbone of the TPsiC and acceptor arms of tRNAPhe and Xpo-t-RanGTP. Analysis of mutant or precursor tRNA forms demonstrates that, aside from these recognition elements, accurate 5' and 3' end-processing of tRNA affects Xpo-t-RanGTP interaction and nuclear export, while aminoacylation is not essential. Intron-containing, end-processed, pre-tRNAs can be bound by Xpo-t-RanGTP and are rapidly exported from the nucleus if Xpo-t is present in excess. These results suggest that at least two mechanisms are involved in discrimination of pre-tRNAs and mature tRNAs prior to nuclear export.

PubMed ID: 9857198
PMC ID: PMC1171087
Article link: EMBO J


Species referenced: Xenopus
Genes referenced: kidins220 post ran trna xpot

References [+] :
Altman, Recent studies of ribonuclease P. 1993, Pubmed