J. Cell Biol.
© The Rockefeller University Press
0021-9525/97/04/27/09 $2.00
Volume 137, Number 1, April 7, 1997 27-35

A Role for the M9 Transport Signal of hnRNP A1 in mRNA Nuclear Export

Elisa Izaurralde,^* Artur Jarmolowski,^* Christina Beisel,^* Iain W. Mattaj,^* Gideon Dreyfuss, and Utz Fischer

^* European Molecular Biology Laboratory, D-69117 Heidelberg, Germany; and  Howard Hughes Medical Institute and Department of Biochemistry and Biophysics, University of Pennsylvania School of Medicine, Pennsylvania 19104-6148

Among the nuclear proteins associated with mRNAs before their export to the cytoplasm are the abundant heterogeneous nuclear (hn) RNPs. Several of these contain the M9 signal that, in the case of hnRNP A1, has been shown to be sufficient to signal both nuclear export and nuclear import in cultured somatic cells. Kinetic competition experiments are used here to demonstrate that M9-directed nuclear import in Xenopus oocytes is a saturable process. Saturating levels of M9 have, however, no effect on the import of either U snRNPs or proteins carrying a classical basic NLS. Previous work demonstrated the existence of nuclear export factors specific for particular classes of RNA. Injection of hnRNP A1 but not of a mutant protein lacking the M9 domain inhibited export of mRNA but not of other classes of RNA. This suggests that hnRNP A1 or other proteins containing an M9 domain play a role in mRNA export from the nucleus. However, the requirement for M9 function in mRNA export is not identical to that in hnRNP A1 protein transport.

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