Perturbation of protein kinase CK2 uncouples executive part of phosphate maintenance pathway from cyclin-CDK control
Thomas Barz1, Karin Ackermann, Walter Pyerin
1Biochemische Zellphysiologie (A135), Deutsches Krebsforschungszentrum, Im Neuenheimer Feld 280, D-69120 Heidelberg, Germany.
Abstract:
The budding yeast Saccharomyces cerevisiae encounters phosphate starvation by the transcription-regulated PHO pathway. We find that genetic perturbation of protein kinase CK2, a conserved tetrameric Ser/Thr phosphotransferase with links to cell cycle and transcription, affects expression of PHO pathway genes in a subunit- and isoform-specific manner. Remarkably, the genes encoding phosphate supplying phosphatases and transporters are significantly repressed, while the genes encoding components of the central pathway regulator complex, a cyclin-dependent kinase (CDK), a cyclin, and a CDK inhibitor, remain unaltered. Thus, perturbation of CK2 uncouples the executive part of the PHO pathway from its cyclin-CDK control complex.
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