Mol. Cell. Biol., Apr 1995, 1835-1846, Vol 15, No. 4
CJ Di Como, H Chang and KT Arndt
The Saccharomyces cerevisiae CLN3 protein, a G1 cyclin, positively
regulates the expression of CLN1 and CLN2, two additional G1 cyclins whose
expression during late G1 is activated, in part, by the transcription
factors SW14 and SW16. We isolated 12 complementation groups of mutants
that require CLN3. The members of one of these complementation groups have
mutations in the BCK2 gene. In a wild-type CLN3 genetic background, bck2
mutants have a normal growth rate but have a larger cell size, are more
sensitive to alpha-factor, and have a modest defect in the accumulation of
CLN1 and CLN2 RNA. In the absence of CLN3, bck2 mutations cause an
extremely slow growth rate: the cells accumulate in late G1 with very low
levels of CLN1 and CLN2 RNA. The slow growth rate and long G1 delay of bck2
cln3 mutants are cured by heterologous expression of CLN2. Moreover,
overexpression of BCK2 induces very high levels of CLN1, CLN2, and HCS26
RNAs. The results suggest that BCK2 and CLN3 provide parallel activation
pathways for the expression of CLN1 and CLN2 during late G1.
Copyright © 1995, American Society for Microbiology
Activation of CLN1 and CLN2 G1 cyclin gene expression by BCK2
Cold Spring Harbor Laboratory, New York 11724-2212.
This article has been cited by other articles:
Copyright © 2009 by the American Society for Microbiology. For an alternate route to Journals.ASM.org, visit: http://intl-journals.asm.org | More Info»