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Only correctly folded and mature tRNAs can leave the nucleus and enter the cytoplasm. Surprisingly, tRNA-aminoacylation has been found to occur, not only in the cytosol, but also inside the nucleus, where it may act as an additional proofreading step and facilitate the export of ‘ready-to-function’ aminoacyl-tRNAs.
One of the largest supramolecular assemblies in the eukaryotic cell, the nuclear pore complex, is now being dissected into its numerous molecular constituents. The combined use of biochemistry and genetics in yeast has made this rapid development possible. Although less is known about vertebrate nucleoporins, the first clues are now emerging about their in vivo function also. Much remains to be learned...
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