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Journal of Bacteriology, November 1998, p. 5718-5726, Vol. 180, No. 21
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
The Highly Conserved, Coregulated SNO
and SNZ Gene Families in Saccharomyces cerevisiae
Respond to Nutrient Limitation
Pamela A.
Padilla,
Edwina K.
Fuge,
Matthew E.
Crawford,
Allison
Errett, and
Margaret
Werner-Washburne*
Department of Biology, University of New
Mexico, Albuquerque, New Mexico 87131
Received 20 July 1998/Accepted 31 August 1998
SNZ1, a member of a highly conserved gene family, was
first identified through studies of proteins synthesized in
stationary-phase yeast cells. There are three SNZ genes in
Saccharomyces cerevisiae, each of which has another highly
conserved gene, named SNO (SNZ proximal open
reading frame), upstream. The DNA sequences and relative positions of
SNZ and SNO genes have been phylogenetically conserved. This report details studies of the expression of the SNZ-SNO gene pairs under various conditions and phenotypic
analysis of snz-sno mutants. An analysis of total RNA was
used to determine that adjacent SNZ-SNO gene pairs are
coregulated. SNZ2/3 and SNO2/3 mRNAs are
induced prior to the diauxic shift and decrease in abundance during the
postdiauxic phase, when SNZ1 and SNO1 are
induced. In snz2 snz3 mutants, SNZ1 mRNA is
induced prior to the diauxic shift, when SNZ2/3 mRNAs are
normally induced. Under nitrogen-limiting conditions, SNZ1
mRNAs accumulate in tryptophan, adenine, and uracil auxotrophs but not
in prototrophic strains, indicating that induction occurs in response
to the limitation of specific nutrients. Strains carrying deletions in
all SNZ-SNO gene pairs are viable, but snz1 and
sno1 mutants are sensitive to 6-azauracil (6-AU), an
inhibitor of purine and pyrimidine biosynthetic enzymes, and methylene
blue, a producer of singlet oxygen. The conservation of sequence and
chromosomal position, the coregulation and pattern of expression of
SNZ1 and SNO1 genes, and the sensitivity of
snz1 and sno1 mutants to 6-AU support the
hypothesis that the associated proteins are part of an ancient response
to nutrient limitation.
*
Corresponding author. Mailing address: Department of
Biology, University of New Mexico, Albuquerque, NM 87131. Phone: (505) 277-9338. Fax: (505) 277-0304. E-mail: maggieww{at}unm.edu.
Journal of Bacteriology, November 1998, p. 5718-5726, Vol. 180, No. 21
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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