title: Properties of a polynucleotide synthesized by strain 74A of Neurospora crassa.
abstract: A polynucleotide (or a fragment of RNA) was purified to apparent homogeneity by HPLC from mycelium of the wild strain 74A of the mould Neurospora crassa, after growth on sucrose and in the presence of saturating amounts of inorganic phosphate (Pi) for 72 hr at 30 degrees. The M(r) was ca 20,000 as determined by HPLC at pH 6.8. Polynucleotide synthesis ranged from 4.0 to 6.5 micrograms polynucleotide per mg dry mycelium in mycelium of the wild strain 74A and the various phosphorus regulatory and structural mutant strains of the mould N. crassa. Kinetic data showed that the polynucleotide interacts with mycelial Pi-repressible alkaline phosphatase by inhibiting its p-nitrophenylphosphatase activity and by protecting the enzyme against thermal inactivation in the presence of high concentrations of ammonium sulphate.
authors.affiliation: Departamento de Bioquimica e Microbiologia, IB - UNESP, Rio Claro, SP, Brazil
authors.forename: E C
authors.initials: EC
authors.lastname: Carmona
authors.forename: S W
authors.initials: SW
authors.lastname: Han
authors.forename: M S
authors.initials: MS
authors.lastname: Palma
authors.forename: A
authors.initials: A
authors.lastname: Rossi
mesh_terms: D000469:Alkaline Phosphatase / Q000378:metabolism; D004789:Enzyme Activation; D006358:Hot Temperature; D007700:Kinetics; D008970:Molecular Weight; D009492:Neurospora crassa / Q000737:chemistry / Q000378:metabolism*; D010710:Phosphates / Q000378:metabolism; D011119:Polynucleotides / Q000096:biosynthesis* / Q000302:isolation & purification; D012331:RNA, Fungal / Q000096:biosynthesis* / Q000302:isolation & purification
chemical_list: D010710:Phosphates; D011119:Polynucleotides; D012331:RNA, Fungal; D000469:Alkaline Phosphatase