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Mol. Cell. Biol., 06 1995, 3129-3137, Vol 15, No. 6
M Maher, F Cong, D Kindelberger, K Nasmyth and S Dalton
Clb2 is the major B-type mitotic cyclin required for entry into mitosis in
the budding yeast Saccharomyces cerevisiae. We showed that accumulation of
CLB2 transcripts in G2 cells is controlled at the transcriptional level and
identified a 55-bp upstream activating sequence (UAS) containing an Mcm1
binding site as being necessary and sufficient for cell cycle regulation.
Sequences within the cell cycle- regulated UAS were shown to bind Mcm1 in
vitro, and mutation which abolished Mcm1-dependent DNA binding activity
eliminated cell cycle- regulated transcription in vivo. A second protein
with no autonomous DNA binding activity was also recruited into Mcm1-UAS
complexes, generating a ternary complex. A point mutation in the CLB2 UAS
which blocked ternary complex formation, but still allowed Mcm1 to bind,
resulted in loss of cell cycle regulation in vivo, suggesting that the
ternary complex factor is also important in control of CLB2 transcription.
We discuss the possibility that the CLB2 gene is coregulated with other
genes known to be regulated with the same periodicity and suggest that Mcm1
and the ternary complex factor may coordinately regulate several other
G2-regulated transcripts.
Copyright © 1995, American Society for Microbiology
Cell cycle-regulated transcription of the CLB2 gene is dependent on Mcm1 and a ternary complex factor
Roche Institute of Molecular Biology, Nutley, New Jersey 07110-1199, USA.
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