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J Cell Biochem. 2006 Oct 15;99(3):890-904.

CDC2L5, a Cdk-like kinase with RS domain, interacts with the ASF/SF2-associated protein p32 and affects splicing in vivo.

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  • 1Laboratoire Arago, CNRS-UMR 7628/Universit√© Pierre et Marie Curie, BP 44, F-66651 Banyuls-sur-Mer cedex, France.


The human CDC2L5 gene encodes a protein of unknown physiological function. This protein is closely related to the cyclin-dependent kinase (Cdks) family and contains an arginine/serine-rich (RS) domain. The Cdks were first identified as crucial regulators of cell-cycle progression, more recently they were found to be involved in transcription and mRNA processing. RS domains are mainly present in proteins regulating pre-mRNA splicing, suggesting CDC2L5 having a possible role in this process. In this study, we demonstrate that CDC2L5 is located in the nucleoplasm, at a higher concentration in speckles, the storage sites for splicing factors. Furthermore, this localization is dependent on the presence of the N-terminal sequence including the RS domain. Then, we report that CDC2L5 directly interacts with the ASF/SF2-associated protein p32, a protein involved in splicing regulation. Overexpression of CDC2L5 constructs disturbs constitutive splicing and switches alternative splice site selection in vivo. These results argue in favor of a functional role of the CDC2L5 kinase in splicing regulation.

2006 Wiley-Liss, Inc.

[PubMed - indexed for MEDLINE]
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