Nucleic Acids Research, 1987, Vol. 15, No. 24 10299-10309
© 1987
Articles |
Negative regulators of the PHO system in Saccharomyces cerevisiae: isolation and structural characterization of PHO85
Department of Fermentation Technology, Hiroshima University Shitami, Saijo, Higashihiroshima 724, Japan
*To whom correspondence should be addressed
Received September 11, 1987. Revised November 18, 1987. Accepted November 18, 1987.
One of the negative regulators of the PHO system of Saccharomyces cerevisiae, PHO85, has been isolated by transformation and complementation of a pho85 strain. The complementing activity was delimited within a 1258 bp DNA segment and this region has been sequenoed. The largest open reading frame found in this region can encode a protein of 302 amino acid residues. A pho85 mutant resulted from disruption of the chromosomal counterpart of the open reading frame described above. Therefore, we concluded that the gene we have cloned is PHO85. This result also indicates that PHO85 is nonessential. Northern analysis revealed that the size of the PHO85 message is l.l kb. No similarity was found between the putative amino acid sequences of two negative regulators, the PHO80 and PHO85 proteins.
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