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Volume 272, Number 47, Issue of November 21, 1997 pp. 29475-29481
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.

Fibroblast Growth Factor 3, a Protein with Dual Subcellular Localization, Is Targeted to the Nucleus and Nucleolus by the Concerted Action of Two Nuclear Localization Signals and a Nucleolar Retention Signal

(Received for publication, July 11, 1997, and in revised form, September 8, 1997)

Marianne Antoine , Kerstin Reimers , Clive Dickson and Paul Kiefer

From the Ruhr-Universitaet Bochum, Medizinische Fakultaet, Institut fuer Hygiene und Mikrobiologie, Abteilung fuer Medizinische Mikrobiologie Virologie, Universitaetsstrasse 150, D-44780, Bochum, Gebaeude MA 6/130, Germany and  Imperial Cancer Research Fund Laboratories, 44 Lincoln's Inn Fields, London WC2A 3PX, United Kingdom

The major isoform of fibroblast growth factor 3 (FGF3) is initiated from a CUG codon, and the resultant product is distributed to the nucleus/nucleolus and secretory pathway. This dual subcellular localization is achieved in part by the competing effects of two classical intracellular targeting signals located near the amino terminus. At the extreme amino terminus is a short stretch of 29 amino acids before a signal peptide necessary for translocation into the endoplasmic reticulum, which is next to an adjacent bipartite nuclear localization signal. The carboxyl-terminal region of FGF3 is also implicated in nuclear/nucleolar localization. We describe here the characterization of carboxyl-terminal signals by showing they are capable of directing a heterologous protein, -galactosidase, to the nucleus. Furthermore, appending both the amino- and carboxyl-terminal domains onto -galactosidase, reproduces the dual subcellular localization properties of FGF3. Nuclear uptake of FGF3 appears to be signal-mediated since it binds to karyopherin , the nuclear localization signal binding subunit of a heterodimeric receptor of the nuclear import machinery. The import of FGF3 into the nucleus is energy-dependent, and the inhibition of this process has demonstrated the importance of the nucleolar retention signal in nucleoplasmic and nucleolar accumulation.

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