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Mol. Cell. Biol., Oct 1996, 5375-5385, Vol 16, No. 10
X Wang, MF Hoekstra, AJ DeMaggio, N Dhillon, A Vancura, J Kuret, GC Johnston and RA Singer
The GCS1 gene of the budding yeast Saccharomyces cerevisiae mediate the
resumption of cell proliferation from the starved, stationary-phase state.
Here we identify yeast genes that, in increased dosages, overcome the
growth defect of gcs1 delta mutant cells. Among these are YCK1 (CK12) and
YCK2 (CKI1), encoding membrane-associated casein kinase I, and YCK3,
encoding a novel casein kinase I isoform. Some Yck3p gene product was found
associated with the plasma membrane, like Yck1p and Yck2p, but most
confractionated with the nucleus, like another yeast casein kinase I
isoform, Hrr25p. Genetic studies showed that YCK3 and HRR25 constitute an
essential gene family and that Yck3p can weakly substitute for Yck1p-Yck2p.
For gcs1 delta suppression, both a protein kinase domain and a C-terminal
prenylation motif were shown to be necessary. An impairment in endocytosis
was found for gcs1 delta mutant cells, which was alleviated by an increased
YCK2 gene dosage. The ability of an increased casein kinase I gene dosage
to suppress the effects caused by the absence of Gcs1p suggests that Gcs1p
and Yck1p- Yck2p affect parallel pathways.
Copyright © 1996, American Society for Microbiology
Prenylated isoforms of yeast casein kinase I, including the novel Yck3p, suppress the gcs1 blockage of cell proliferation from stationary phase
Department of Biochemistry, Dalhousie University, Halifax, Nova Scotia, Canada.
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