title: Cloning and characterization of two genes restoring acid phosphatase activity in pho1- mutants of Schizosaccharomyces pombe.
abstract: Schizosaccharomyces pombe acid phosphatase (APh) is a secreted cell surface glycoprotein which is deficient in pho1 mutants. By screening an S. pombe gene bank for sequences which can functionally rescue the pho1-44 mutation, we have isolated two genomic clones carried in plasmids pSp4B and pSp4C/2. These two sequences map of different genetic loci and show no cross hybridization by Southern blotting. pSp4C/2 was found to contain the PHO1 gene, and cells transformed with this plasmid produce a protein which cross-reacts with antibodies raised against the protein moiety of APh. Data from Northern blotting experiments show that pSp4C/2 encodes a 1.6-kb transcript, and that mRNA levels are increased when cells are grown in low concentrations of inorganic phosphate. The results indicate that pSp4C/2 contains the structural gene for APh, PHO1, whereas pSp4B appears to carry a gene coding for a minor species of APh, PHO4 which is not regulated by extracellular phosphate.
mesh_terms: D000135:Acid Phosphatase / Q000235:genetics* / Q000276:immunology; D003001:Cloning, Molecular; D003429:Cross Reactions; D005786:Gene Expression Regulation; D005796:Genes; D005800:Genes, Fungal; D006023:Glycoproteins / Q000235:genetics; D009154:Mutation; D010710:Phosphates / Q000502:physiology; D010957:Plasmids; D012333:RNA, Messenger / Q000235:genetics; D004718:Saccharomycetales / Q000235:genetics*; D012568:Schizosaccharomyces / Q000235:genetics*
chemical_list: D006023:Glycoproteins; D010710:Phosphates; D012333:RNA, Messenger; D000135:Acid Phosphatase