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Nuclear reformation after mitosis requires downregulation of the Ran GTPase effector RanBP1 in mammalian cells (Articolo in rivista)

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Nuclear reformation after mitosis requires downregulation of the Ran GTPase effector RanBP1 in mammalian cells (Articolo in rivista) (literal)

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Ciciarello M, Roscioli E, Di Fiore B, Di Francesco L, Sobrero F, Bernard D, Mangiacasale R, Harel A, Schininà ME, Lavia P. (2010)
Nuclear reformation after mitosis requires downregulation of the Ran GTPase effector RanBP1 in mammalian cells
in Chromosoma (Berl., Print); Springer, Berlin Heidelberg (Germania)
(literal)

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Ciciarello M, Roscioli E, Di Fiore B, Di Francesco L, Sobrero F, Bernard D, Mangiacasale R, Harel A, Schininà ME, Lavia P. (literal)

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Pubblicazione prodotta nell'ambito del programma triennale FIRB-Internazionalizzazione del MIUR tra Italia-Israele (2006-09, poi prorogato al gennaio 2010) \"Analisi cellulare e molecolare delle interazioni regolative tra apparato mitotico e involucro nucleare: segnali che regolano la transizione mitosi-interfase\" di cui l'IBPM è stato il capofila Italiano. (literal)

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M. Ciciarello, E. Roscioli, F. Sobrero, R. Mangiacasale, P. Lavia: CNR IBPM; B. Di Fiore: Wellcome Trust/Cancer Research UK, Gurdon Institute, Cambridge, UK; L. Di Francesco, M. E. Schininà: Sapienza Università di Roma; D. Bernard, Department of Plant Sciences, University of Cambridge, Cambridge, UK; A. Harel, Technion-Israel Institute of Technology, Haifa, Israel (literal)

Titolo

Nuclear reformation after mitosis requires downregulation of the Ran GTPase effector RanBP1 in mammalian cells (literal)

Abstract

The GTPase Ran regulates nucleocytoplasmic transport in interphase and spindle organisation in mitosis via effectors of the importin beta superfamily. Ran-binding protein 1 (RanBP1) regulates guanine nucleotide turnover on Ran, as well as its interactions with effectors. Unlike other Ran network members that are steadily expressed, RanBP1 abundance is modulated during the mammalian cell cycle, peaking in mitosis and declining at mitotic exit. Here, we show that RanBP1 downregulation takes place in mid to late telophase, concomitant with the reformation of nuclei. Mild RanBP1 overexpression in murine cells causes RanBP1 to persist in late mitosis and hinders a set of events underlying the telophase to interphase transition, including chromatin decondensation, nuclear expansion and nuclear lamina reorganisation. Moreover, the reorganisation of nuclear pores fails associated with defective nuclear relocalisation of NLS cargoes. Co-expression of importin beta, together with RanBP1, however mitigates these defects. Thus, RanBP1 downregulation is required for nuclear reorganisation pathways operated by importin beta after mitosis. (literal)

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