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    Tissue Cell. 2005 Feb;37(1):53-8. Epub 2005 Jan 25.

    Cyclin-dependent kinase activating kinase/Cdk7 co-localizes with PKC-iota in human glioma cells.

    Bicaku E, Patel R, Acevedo-Duncan M.

    Department of Chemistry, University of South Florida, USA.

    Cyclin-dependent kinase activating kinase (CAK) is a trimeric complex composed of cdk7, cyclin H and MAT1. CAK/cdk7 functions as a master cell cycle regulator by phosphorylating cyclin-dependent kinases for cell cycle progression. We have previously reported that protein kinase C-iota (PKC-iota) associates with CAK/cdk7. In this investigation, immunofluorescence confocal microscopy was used to provide further evidence for the co-localization of PKC-iota with CAK/cdk7. PKC-iota was labeled with Alexa Fluor 488 (green fluorescent dye) and CAK/cdk7 was labeled with Alexa Fluor 555 (red fluorescent dye). The fusion of the red and green fluorescent colors produced a yellow color, which was used to quantify co-localization of PKC-iota and CAK/cdk7. Confocal microscopy revealed the co-localization of PKC-iota with CAK/cdk7 in both the cytoplasm and nucleus of U-373 MG cells.

    PMID: 15695176 [PubMed - indexed for MEDLINE]

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