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Transportin-1-dependent YB-1 nuclear import.

Authors:
Daria A Mordovkina Ekaterina R Kim Ilya A Buldakov Alexey V Sorokin Irina A Eliseeva Dmitry N Lyabin Lev P Ovchinnikov

Biochem Biophys Res Commun 2016 Nov 26;480(4):629-634. Epub 2016 Oct 26.

Institute of Protein Research, Russian Academy of Sciences, 4 Institutskaya St., 142290, Pushchino, Moscow Region, Russia. Electronic address:

The DNA/RNA-binding protein YB-1 (Y-box binding protein 1) performs multiple functions both in the cytoplasm and the nucleus of the cell. Generally localized to the cytoplasm, under certain conditions YB-1 is translocated to the nucleus. Here we report for the first time a transport factor that mediates YB-1 nuclear import - transportin-1. The YB-1/transportin-1 complex can be isolated from HeLa cell extract. Nuclear import of YB-1 and its truncated form YB-1 (1-219) in in vitro transport assay was diminished in the presence of a competitor substrate and ceased in the presence of transportin-1 inhibitor M9M. Inhibitors of importin β1 had no effect on YB-1 transport. Furthermore, transport of YB-1 (P201A/Y202A) and YB-1 (1-219) (P201A/Y202A) bearing inactivating mutations in the transportin-1-dependent nuclear localization signal was practically abolished. Together, these results indicate that transportin-1 mediates YB-1 nuclear translocation.

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http://dx.doi.org/10.1016/j.bbrc.2016.10.107DOI Listing
November 2016

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