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- W2023581846 abstract "The RBCK1 protein was recently identified as a protein kinase C-interacting protein with a new type of RBCC (RING-B-Box-Coiled-coil) region, possessing both DNA-binding and transcriptional activities unlike other proteins in the RBCC protein family (Tokunagaet al. Biochem. Biophys. Res. Commun.244, 353–359, 1998). To identify protein motifs in the RBCC region of RBCK1 essential for the transcriptional activity, RBCK1 mutant proteins have been constructed and analyzed by using the GAL4 chimeric transcription regulator system. We have found that both of the RING-finger and the B-Box motifs are indispensable for the transcriptional activity of RBCK1. This is the first observation that these protein motifs of the RBCC protein family play a crucial role in transcriptional activation. In addition, we have examined the effect of co-expression of several protein kinases on the transcriptional activity of RBCK1. Protein kinase A (PKA) was found to enhance the activity by about eightfold, whereas both ERK (extracellular signal-regulated kinase) activator kinase 1 (MEK1) and MEK kinase 1 (MEKK1) significantly repressed the activity. Because RBCC proteins are presumed to act as a proto-oncoprotein, these results suggest that the RBCK1 protein is involved in the intracellular signaling cascades along with PKA, MEK1, and MEKK1 and mediates cell growth and differentiation." @default.
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- W2023581846 date "1998-06-01" @default.
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- W2023581846 title "Transcriptional Activity of RBCK1 Protein (RBCC Protein Interacting with PKC 1): Requirement of RING-Finger and B-Box Motifs and Regulation by Protein Kinases" @default.
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- W2023581846 doi "https://doi.org/10.1006/bbrc.1998.8795" @default.
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