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FEBS Lett. 2014 May 21;588(10):1857-68. doi: 10.1016/j.febslet.2014.04.023. Epub 2014 Apr 26.

Transportin-1 and Transportin-2: protein nuclear import and beyond.

Author information

1
Laboratoire de Biologie moléculaire du gène (CP300), Faculté des Sciences, Université Libre de Bruxelles (ULB), Belgium; Center for Microscopy and Molecular Imaging (CMMI), 6041 Gosselies, Belgium. Electronic address: ltwyffel@ulb.ac.be.
2
Laboratoire de Biologie moléculaire du gène (CP300), Faculté des Sciences, Université Libre de Bruxelles (ULB), Belgium.
3
Laboratoire de Biologie moléculaire du gène (CP300), Faculté des Sciences, Université Libre de Bruxelles (ULB), Belgium; Center for Microscopy and Molecular Imaging (CMMI), 6041 Gosselies, Belgium.

Abstract

Nearly 20 years after its identification as a new β-karyopherin mediating the nuclear import of the RNA-binding protein hnRNP A1, Transportin-1 is still commonly overlooked in comparison with its best known cousin, Importin-β. Transportin-1 is nonetheless a considerable player in nucleo-cytoplasmic transport. Over the past few years, significant progress has been made in the characterization of the nuclear localization signals (NLSs) that Transportin-1 recognizes, thereby providing the molecular basis of its diversified repertoire of cargoes. The recent discovery that mutations in the Transportin-dependent NLS of FUS cause mislocalization of this protein and result in amyotrophic lateral sclerosis illustrates the importance of Transportin-dependent import for human health. Besides, new functions of Transportin-1 are emerging in processes other than nuclear import. Here, we summarize what is known about Transportin-1 and the related β-karyopherin Transportin-2.

KEYWORDS:

FUS; Importins; Kap104p; Karyopherin-β2; Karyopherins; NLS; Nuclear import; Nucleo-cytoplasmic transport; Transportin; Transportin-1; Transportin-2; hnRNP A1

PMID:
24780099
DOI:
10.1016/j.febslet.2014.04.023
[Indexed for MEDLINE]
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