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Nucleic Acids Research, 2002, Vol. 30, No. 10 2251-2260
© 2002 Oxford University Press

Identification of nucleolin and nucleophosmin as genotoxic stress-responsive RNA-binding proteins

Chonglin Yang, Dony A. Maiguel and France Carrier*

University of Maryland, Baltimore, School of Medicine, Biochemistry and Molecular Biology Department, 108 North Greene Street, Baltimore, MD 21201-1503, USA

Genotoxic stress (DNA damage) can elicit multiple responses in mammalian cells, including the activation of numerous cascades of signal transduction that result in the activation of cellular genes involved in growth control, DNA repair and apoptosis. In an earlier report, we have shown that DNA-damaging agents can also induce the RNA-binding activity of several specific proteins that favor a double stem–loop RNA structure. Here we report the purification and identification of nucleophosmin (NPM) and nucleolin as two genotoxic stress-responsive RNA-binding proteins. UV radiation induces the protein expression levels and RNA-binding activity of NPM while nucleolin RNA-binding activity increases after UV or ionizing radiation exposure. Moreover, we have identified 40 mRNA ligands that are potentially regulated by nucleolin, several of which are stress-responsive transcripts. In addition, our data indicate that activation of nucleolin RNA-binding activity by genotoxic stress is mediated by stress-activated protein kinase p38. Our findings suggest that activation of the RNA-binding properties of nucleolin and NPM is part of the cellular response to genotoxic stress.

* To whom correspondence should be addressed. Tel: +1 410 706 5105; Fax: +1 410 706 8297; Email: fcarr001{at}umaryland.edu


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