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Pho85, a multifunctional cyclin‐dependent protein kinase in budding yeast
Author(s) -
Huang Dongqing,
Friesen Helena,
Andrews Brenda
Publication year - 2007
Publication title -
molecular microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.857
H-Index - 247
eISSN - 1365-2958
pISSN - 0950-382X
DOI - 10.1111/j.1365-2958.2007.05914.x
Subject(s) - cyclin dependent kinase , biology , cyclin dependent kinase 1 , cyclin , cell cycle , saccharomyces cerevisiae , kinase , microbiology and biotechnology , cell cycle protein , yeast , biochemistry , gene
Summary Pho85 is a multifunctional cyclin‐dependent kinase (Cdk) in Saccharomyces cerevisiae that has emerged as an important model for the role of Cdks in both cell cycle control and other processes. Pho85 is targeted to its substrates by 10 different cyclins or Pcls. Three of these Pcls have specific roles in G1 phase of the cell cycle, both in regulating G1‐specific gene expression and in controlling polarized growth. Many known substrates of the G1 forms of Pho85 are also phosphorylated by the homologous Cdk Cln–Cdc28, suggesting parallel or overlapping roles. Most of the remaining Pcls function in signalling: Pho85 is generally active when environmental conditions are satisfactory, phosphorylating proteins involved in transcription and other regulatory events to keep the stress response and inappropriate activities turned off. Recently, genetic screens for synthetic lethality and synthetic dosage lethality, and proteomic screens for in vitro Pho85 substrates, have revealed more details about how Pho85 functions to regulate a variety of cellular processes.