Abstract
Two clones from a lambda phage collection containing yeast genes regulated by inorganic phosphate were shown by low-stringency hybridization to select three mRNAs that direct the in vitro synthesis of repressible acid phosphatase (EC 3.1.3.2) polypeptides p60, p58, and p56. By higher stringency hybridization one yeast fragment [8 kilobases (kb)] selects p60 mRNA and the other (5 kb) selects p56 mRNA. These EcoRI digestion fragments were subcloned in yeast transformation vectors and hybridization selection assignments were confirmed by measuring enzyme and mRNA levels in transformants. Enzyme and mRNA levels in (8-kb) high copy number transformants grown in high inorganic phosphate medium revealed a hitherto undetected acid phosphatase protein, P57, which is believed to correspond to the constitutive enzyme encoded by PHO3. The identify of the 8-kb fragment purported to contain the PHO5/PHO3 genes was confirmed by genetic mapping of an integrated copy of this fragment. The site of integration of the 5-kb fragment was demonstrated to be unlinked to the PHO5/PHO3 genes.
MeSH Terms
Acid Phosphatase/genetics
Bacteriophage lambda/genetics
Chromosome Mapping
DNA, Recombinant/metabolism
Genes
Nucleic Acid Hybridization
Operon
RNA, Messenger/genetics,metabolism
Saccharomyces cerevisiae/genetics
Transcription, Genetic
Chemicals
DNA, Recombinant
RNA, Messenger
Acid Phosphatase
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Rogers D T
Lemire J M
Bostian K A
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