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Abstract

  1. Top of page
  2. Abstract
  3. REFERENCES

We have previously reported the isolation of the gene coding for a 25-kDa polypeptide present in a purified yeast QH2:cytochrome c oxidoreductase preparation, which was thus identified as the gene for the Rieske ironsulphur protein [Van Loon et al. (1983) Gene 26, 261–272]. Subsequent DNA sequence analysis reported here reveals, however, that the encoded protein is in fact manganese superoxide dismutase, a mitochondrial matrix protein. Comparison with the known amino acid sequence of the mature protein indicates that it is synthesized with an N-terminal extension of 27 amino acids. In common with the N-terminal extensions of other imported mitochondrial proteins, the presequence has several basic residues but lacks negatively charged residues. The function of these positive charges and other possible topogenic sequences are discussed. Sequences 5′ of the gene contain two elements that may be homologous to the suggested regulatory sites, UAS 1 and UAS 2 in the yeast CYC1-gene [Guarente et al. (1984) Cell 36, 503–511]. The predicted secondary structures in manganese superoxide dismutase appear to be very similar to those reported for iron superoxide dismutase, suggesting similar three-dimensional structures. Making use of the known three-dimensional structure of the Fe enzyme, the Mn ligands are predicted.

Abbreviations
QH2

ubiquinol

kb

103 bases

bp

base pairs

Enzymes
 

QH2:cytochrome c oxidoreductase (EC 1.10.2.2)

 

superoxide dismutase (EC 1.15.1.1)

REFERENCES

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  2. Abstract
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