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Identification of PSF as a protein kinase Cα-binding protein in the cell nucleus

✍ Scribed by Uwe Rosenberger; Ingo Lehmann; Christoph Weise; Peter Franke; Ferdinand Hucho; Klaus Buchner

Publisher
John Wiley and Sons
Year
2002
Tongue
English
Weight
148 KB
Volume
86
Category
Article
ISSN
0730-2312

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✦ Synopsis

Protein kinase C (PKC) isoforms are present in the cell nucleus in diverse cell lines and tissues. Since little is known about proteins interacting with PKC inside the cell nucleus, we used Neuro-2a neuroblastoma cells, in which PKCalpha is present in the nucleus, to screen for nuclear binding partners for PKC. Applying overlay assays, we detected several nuclear proteins which bind to PKCalpha. Specificity of binding was shown by its dependence on PKC activation by phorbol ester, calcium, and phosphatidylserine. The PKC-binding proteins were partially purified and analyzed by microsequencing and mass spectrometry. Four proteins could be identified: PTB-associated splicing factor (PSF), p68 RNA helicase, and the heterogeneous nuclear ribonucleoprotein (hnRNP) proteins A3 and L. In the case of PSF, binding to PKC could also be demonstrated in a GST-pull-down assay using GST-PKCalpha, expressed in insect cells. Phosphorylation experiments revealed that PSF is a weak in vitro substrate for PKCalpha.

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