title: Characterization and expression of a Neurospora crassa ribosomal protein gene, crp-7.
abstract: We have isolated and characterized a Neurospora crassa cytoplasmic ribosomal protein gene, named crp-7, which is found upstream of the photolyase gene. The deduced amino-acid sequence of this gene is highly homologous to the YS25 ribosomal protein of Saccharomyces cerevisiae. The crp-7 ORF consists of two exons which are separated by a short intron. The deduced polypeptide contains 87 amino acid residues and has a calculated molecular weight of 9.7 kDa. RFLP mapping showed that the crp-7 gene is located on the right arm of linkage group I. Southern blot hybridization analyses indicated that there is only one copy of the crp-7 gene in the N. crassa genome. Transcriptional elements, the Dde box, the Taq box and the CG element, that have been identified in other N. crassa ribosomal protein genes are observed in the promoter region of the crp-7 gene. The crp-7 mRNA levels were low in conidia and highest in young mycelia during vegetative growth. The mRNA levels of four r-protein genes, including the crp-7 gene, as well as the tef-1 gene encoding translational elongation factor 1 alpha, were raised following the treatment of mycelia with a low concentration of cycloheximide. This indicates that the expression of r-protein genes is under the control of so-called super-induction.
authors.affiliation: Laboratory of Genetics, Department of Regulation Biology, Faculty of Science, Urawa, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Kusuda
authors.forename: H
authors.initials: H
authors.lastname: Yajima
authors.forename: H
authors.initials: H
authors.lastname: Inoue
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D003513:Cycloheximide / Q000494:pharmacology; D004271:DNA, Fungal / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification; D005091:Exons; D005656:Fungal Proteins; D018628:Gene Dosage; D015966:Gene Expression Regulation, Fungal / Q000187:drug effects; D005800:Genes, Fungal / Q000235:genetics*; D007438:Introns; D008969:Molecular Sequence Data; D009492:Neurospora crassa / Q000187:drug effects / Q000235:genetics*; D012150:Polymorphism, Restriction Fragment Length; D012331:RNA, Fungal / Q000187:drug effects / Q000235:genetics / Q000378:metabolism; D012269:Ribosomal Proteins / Q000235:genetics*; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid
chemical_list: C407882:CRP7 protein, Neurospora crassa; D004271:DNA, Fungal; D005656:Fungal Proteins; D012331:RNA, Fungal; D012269:Ribosomal Proteins; D003513:Cycloheximide