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Snurportin 1 is an adaptor protein that mediates the active nuclear import of uridine-rich small nuclear RNAs (U snRNA) by the importin-β receptor pathway. Its cellular activity influences the overall transport yield of small ribonucleoprotein complexes containing N2,N2,7-trimethylguanosine (TMG) capped U snRNA. So far little is still known about structural requirements related to molecular recognition...
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