Molecular analysis of nuc-1+, a gene controlling phosphorus acquisition in Neurospora crassa.
In response to phosphorus starvation, Neurospora crassa makes several enzymes that are undetectable or barely detectable in phosphate-sufficient cultures. The nuc-1+ gene, whose product regulates the synthesis of these enzymes, was cloned and sequenced. The nuc-1+ gene encodes a protein of 824 amino acids with a predicted molecular weight of 87,429. The amino acid sequence shows homology with two yeast proteins whose functions are analogous to that of the NUC-1 protein. Two nuc-1+ transcripts of 3.2 and 3.0 kilobases were detected; they were present in similar amounts during growth at low or high phosphate concentrations. The nuc-2+ gene encodes a product normally required for NUC-1 function, and yet a nuc-2 mutation can be complemented by overexpression of the nuc-1+ gene. This implies physical interactions between NUC-1 protein and the negative regulatory factor(s) PREG and/or PGOV. Analysis of nuc-2 and nuc-1; nuc-2 strains transformed by the nuc-1+ gene suggests that phosphate directly affects the level or activity of the negative regulatory factor(s) controlling phosphorus acquisition.
Kang
S
S
Department of Physiological Chemistry, University of Wisconsin, Madison 53706.
Metzenberg
R L
RL
D000469:Alkaline Phosphatase / Q000235:genetics; D000595:Amino Acid Sequence; D001483:Base Sequence; D015139:Blotting, Southern; D015825:Chromosomes, Fungal; D003001:Cloning, Molecular; D003433:Crosses, Genetic; D004271:DNA, Fungal / Q000235:genetics / Q000302:isolation & purification; D005800:Genes, Fungal; D005816:Genetic Complementation Test; D008040:Genetic Linkage; D005838:Genotype; D008969:Molecular Sequence Data; D009154:Mutation; D009492:Neurospora crassa / Q000235:genetics* / Q000378:metabolism; D010758:Phosphorus / Q000378:metabolism*; D015183:Restriction Mapping; D012441:Saccharomyces cerevisiae / Q000235:genetics; D012689:Sequence Homology, Nucleic Acid; D014158:Transcription, Genetic
D004271:DNA, Fungal; D010758:Phosphorus; D000469:Alkaline Phosphatase