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  • Title: Identification of the polypeptide encoded by the URF-1 gene of Neurospora crassa mtDNA.
    Author: Zauner R, Christner J, Jung G, Borchart U, Machleidt W, Videira A, Werner S.
    Journal: Eur J Biochem; 1985 Aug 01; 150(3):447-54. PubMed ID: 3160590.
    Abstract:
    Two peptides, potentially representing antigenic determinants of a proposed gene product, were synthesized. The peptide sequences were deduced from the nucleotide sequence of the unidentified reading frame (URF)1 of the Neurospora crassa mitochondrial genome. Specific antisera to the synthetic peptides were produced. The antibodies recognized a single polypeptide species with an apparent relative molecular mass of about 30 000. The mitochondrial origin of this polypeptide was verified by in vivo labelling experiments in the presence of cycloheximide, as well as by in vitro translation using isolated mitochondria. The chemical identification of the protein was performed by partial radiosequencing of the N-terminal portion of the immunoprecipitated URF-1 product. The amount of URF-1 polypeptide present in N. crassa mitochondria is in the range of 1-2%. The protein is a constituent of the inner envelope of the organelle and probably part of a more complex membrane unit.
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