title: Isolation, characterization, and inactivation of the APA1 gene encoding yeast diadenosine 5',5'''-P1,P4-tetraphosphate phosphorylase.
abstract: The gene encoding diadenosine 5',5'''-P1,P4-tetraphosphate (Ap4A) phosphorylase from yeast was isolated from a lambda gt11 library. The DNA sequence of the coding region was determined, and more than 90% of the deduced amino acid sequence was confirmed by peptide sequencing. The Ap4A phosphorylase gene (APA1) is unique in the yeast genome. Disruption experiments with this gene, first, supported the conclusion that, in vivo, Ap4A phosphorylase catabolizes the Ap4N nucleotides (where N is A, C, G, or U) and second, revealed the occurrence of a second Ap4A phosphorylase activity in yeast cells. Finally, evidence is provided that the APA1 gene product is responsible for most of the ADP sulfurylase activity in yeast extracts.
authors.affiliation: Laboratoire de Biochimie, Unité de Recherche Associée 240 Centre National de Recherche Scientifique, Ecole Polytechnique, Palaiseau, France.
authors.forename: P
authors.initials: P
authors.lastname: Plateau
authors.forename: M
authors.initials: M
authors.lastname: Fromant
authors.forename: J M
authors.initials: JM
authors.lastname: Schmitter
authors.forename: J M
authors.initials: JM
authors.lastname: Buhler
authors.forename: S
authors.initials: S
authors.lastname: Blanquet
mesh_terms: D000595:Amino Acid Sequence; D000906:Antibodies; D000936:Antigen-Antibody Complex / Q000032:analysis; D010582:Bacteriophage lambda / Q000235:genetics; D001483:Base Sequence; D003001:Cloning, Molecular; D004271:DNA, Fungal / Q000037:antagonists & inhibitors / Q000235:genetics* / Q000302:isolation & purification; D004926:Escherichia coli / Q000235:genetics; D005800:Genes, Fungal; D015698:Genomic Library; D007700:Kinetics; D008969:Molecular Sequence Data; D009713:Nucleotidyltransferases / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism; D010957:Plasmids; D015183:Restriction Mapping; D012441:Saccharomyces cerevisiae / Q000201:enzymology / Q000235:genetics*; D010948:Viral Plaque Assay
chemical_list: D000906:Antibodies; D000936:Antigen-Antibody Complex; D004271:DNA, Fungal; D009713:Nucleotidyltransferases; C044740:diadenosine 5,5'''-P(1),P(4)-tetraphosphate alpha,beta-phosphorylase