title: CDK13/CDC2L5 interacts with L-type cyclins and regulates alternative splicing.
abstract: Due to the strong sequence homology it has been suggested that CDC2L5 and CDK12 belong to a high molecular weight subfamily of CDC2 family with PITAI/VRE motifs [F. Marques, J.L. Moreau, G. Peaucellier, J.C. Lozano, P. Schatt, A. Picard, I. Callebaut, E. Perret, A.M. Geneviere, A new subfamily of high molecular mass CDC2-related kinases with PITAI/VRE motifs, Biochem. Biophys. Res. Commun. 279 (2000) 832-837]. Recently, we reported that CDK12 interacts with L-type cyclins and is involved in alternative splicing regulation [H.-H. Chen, Y.-C. Wang, M.-J. Fann, Identification and characterization of the CDK12/Cyclin L1 complex involved in alternative splicing regulation, Mol. Cel. Biol. 26 (2006) 2736-2745]. Here, we provide evidence that CDC2L5 also interacts with L-type cyclins and thus rename it as cyclin-dependent kinase 13 (CDK13). The kinase domain of CDK13 is sufficient to bind the cyclin domains of L-type cyclins. Moreover, CDK13 and L-type cyclins modulate each other's subcellular localization. When CDK13 and an E1a minigene reporter construct were over-expressed in HEK293T cells, CDK13 alters the splicing pattern of E1a transcripts in a dose-dependent manner. Similar to effects of CDK12, effects of CDK13 on splicing pattern are counteracted by SF2/ASF and SC35. These findings strengthen CDK12 and CDK13 as a subfamily of cyclin-dependent kinases that regulate alternative splicing.
authors.affiliation: Institute of Neuroscience, National Yang-Ming University, Taipei 11221, Taiwan, ROC.
authors.forename: Hung-Hsi
authors.initials: HH
authors.lastname: Chen
authors.forename: Yu-Hui
authors.initials: YH
authors.lastname: Wong
authors.forename: Anne-Marie
authors.initials: AM
authors.lastname: Geneviere
authors.forename: Ming-Ji
authors.initials: MJ
authors.lastname: Fann
mesh_terms: D017398:Alternative Splicing / Q000235:genetics / Q000502:physiology*; D000595:Amino Acid Sequence; D015153:Blotting, Western; D016203:CDC2 Protein Kinase / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D002478:Cells, Cultured; D016213:Cyclins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D008969:Molecular Sequence Data; D008970:Molecular Weight; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism
chemical_list: C468873:CCNL1 protein, human; D016213:Cyclins; D012333:RNA, Messenger; D016203:CDC2 Protein Kinase; C072262:CDK13 protein, human