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  • Original Article
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Nuclear import of LASP-1 is regulated by phosphorylation and dynamic protein–protein interactions

Abstract

LASP-1 is a multidomain protein predominantly localized at focal contacts, where it regulates cytoskeleton dynamics and cell migration. However, in different tumor entities, a nuclear LASP-1 accumulation is observed, thought to have an important role in cancer progression. Until now, the molecular mechanisms that control LASP-1 nuclear import were not elucidated. Here, we identified a novel LASP-1-binding partner, zona occludens protein 2 (ZO-2), and established its role in the signal transduction pathway of LASP-1 nucleo-cytoplasmatic shuttling. Phosphorylation of LASP-1 by PKA at serine 146 induces translocation of the LASP-1/ZO-2 complex from the cytoplasm to the nucleus. Interaction occurs within the carboxyterminal proline-rich motif of ZO-2 and the SH3 domain in LASP-1. In situ proximity ligation assay confirmed the direct binding between LASP-1 and ZO-2 and visualized the shuttling. Nuclear export is mediated by Crm-1 and a newly identified nuclear export signal in LASP-1. Finally, dephosphorylation of LASP-1 by phosphatase PP2B is suggested to relocalize the protein back to focal contacts. In summary, we define a new pathway for LASP-1 in tumor progression.

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Acknowledgements

We thank Dr Viacheslav Nikolaev for his help with confocal microscopy. This work was supported by grants from the DFG (BU 740/6-2 to EB, RE 3183/1-1 to CR, SFB 688 A2 to SG) the Innovative Medizinische Forschung, University Hospital Münster (KR110904 to JK) and the Ministerium für Innovation, Wissenschaft und Forschung des Landes Nordrhein-Westfalen (UL and AS).

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Correspondence to E Butt.

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Mihlan, S., Reiß, C., Thalheimer, P. et al. Nuclear import of LASP-1 is regulated by phosphorylation and dynamic protein–protein interactions. Oncogene 32, 2107–2113 (2013). https://doi.org/10.1038/onc.2012.216

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