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Molecular and Cellular Biology, June 2000, p. 3843-3851, Vol. 20, No. 11
Departments of
Biochemistry1 and Cell
Biology,2 Albert Einstein College of Medicine,
Bronx, New York 10461
Received 12 January 2000/Returned for modification 14 February
2000/Accepted 8 March 2000
The transcription of ribosomal DNA, ribosomal protein (RP) genes,
and 5S and tRNA genes by RNA polymerases (Pols) I, II, and III,
respectively, is rapidly and coordinately repressed upon interruption
of the secretory pathway in Saccharomyces cerevisiae. We
find that repression of ribosome and tRNA synthesis in
secretion-defective cells involves activation of the cell integrity
pathway. Transcriptional repression requires the upstream components of
this pathway, including the Wsc family of putative plasma membrane
sensors and protein kinase C (PKC), but not the downstream
Bck1-Mkk1/2-Slt2 mitogen-activated protein kinase cascade. These
findings reveal a novel PKC effector pathway that controls more than
85% of nuclear transcription. It is proposed that the coordination of
ribosome and tRNA synthesis with cell growth may be achieved, in part,
by monitoring the turgor pressure of the cell.
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Repression of Ribosome and tRNA Synthesis in Secretion-Defective
Cells Is Signaled by a Novel Branch of the Cell Integrity
Pathway

*
Corresponding author. Mailing address: Department of
Biochemistry, Albert Einstein College of Medicine, 1300 Morris Park
Ave., Bronx, NY 10461. Phone: (718) 430-2839. Fax: (718) 430-8565. E-mail: willis{at}aecom.yu.edu.
Present address: Department of Physiology and Cellular Biophysics,
College of Physicians and Surgeons, Columbia University, New York, NY 10032.
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