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Background:
Nucleophosmin(NPM1) isaputativeribosomeassemblyfactorwithahighaffinityforpeptidescontainingnuclear localizationsignals(NLSs). Thetransportofproteinsacrossthenuclearenvelopeisaselective,multistepprocessinvolvingseveralcytoplasmicfactors.Proteinsmustbe recognizedasimportsubstrates,dockat thenuclearporecomplexandtranslocateacrossthenuclearenvelopeinanATP-dependent fashion.Severalcytosolicandnuclearproteinsthatarecentral tothisprocesshavebeenidentified.NPM1isinvolvedinribosomalassembly andrRNAtransport. It ishighlyphosphorylatedbyCdc2kinaseduringmitosis






