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Matrix processing peptidase of mitochondria. Structure-function relationships.

H Schneider1, M Arretz, E Wachter

  • 1Institut für Physiologische Chemie, Physikalische Biochemie und Zellbiologie, Universität München, Federal Republic of Germany.

The Journal of Biological Chemistry
|June 15, 1990
PubMed
Summary
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Mitochondrial processing peptidase (MPP) and processing enhancing protein (PEP) cleave mitochondrial precursor proteins. Neurospora MPP

Area of Science:

  • Mitochondrial biology
  • Protein processing
  • Molecular genetics

Background:

  • Mitochondrial precursor proteins require proteolytic cleavage of targeting sequences.
  • Mitochondrial processing peptidase (MPP) and processing enhancing protein (PEP) are key enzymes in this process.

Purpose of the Study:

  • To determine the cDNA sequence of Neurospora MPP.
  • To elucidate the structural and functional characteristics of Neurospora MPP and its relationship to PEP.

Main Methods:

  • Expression cloning of Neurospora MPP cDNA.
  • Sequence analysis and comparison with yeast MPP and PEP.
  • Biochemical assays to determine enzyme activity and metal ion dependence.

Main Results:

Related Experiment Videos

  • The cDNA sequence of Neurospora MPP was determined.
  • Neurospora MPP exhibits a two-domain structure with similarity to yeast MPP and both yeast and Neurospora PEP.
  • Four conserved cysteine residues were identified in Neurospora and yeast MPP.
  • MPP activity is dependent on divalent metal ions and can be inactivated by sulfhydryl reagents.
  • Both MPP and PEP are synthesized as precursors processed during mitochondrial import.

Conclusions:

  • Neurospora MPP shares structural homology with related proteins, suggesting conserved functional mechanisms.
  • Divalent metal ions and specific cysteine residues are crucial for MPP activity.
  • The processing of MPP and PEP precursors highlights a coordinated import and maturation pathway within mitochondria.