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Analysis of elements in the substrate required for processing by mitochondrial processing peptidase

T Ogishima1, T Niidome, K Shimokata

  • 1Department of Chemistry, Kyushu University, Fukuoka, Japan.

The Journal of Biological Chemistry
|December 22, 1995
PubMed
Summary

Synthetic peptides mimicking malate dehydrogenase extension peptides are substrates for mitochondrial processing peptidase. Specific arginine, proline, glycine, and P1

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzyme Kinetics

Background:

  • Mitochondrial processing peptidase (MPP) is crucial for mitochondrial protein maturation.
  • Previous studies identified specific arginine residues in synthetic peptides as important for MPP recognition.

Purpose of the Study:

  • To further investigate the structural elements required for MPP substrate recognition.
  • To develop a rapid and quantitative method for analyzing MPP activity.

Main Methods:

  • Development of intramolecularly quenched fluorescent substrates.
  • Analysis of substrate cleavage by MPP using the developed fluorogenic substrates.

Main Results:

  • The presence of proline and/or glycine between distal and proximal arginine residues is important for substrate recognition.

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  • Other connecting sequences between these arginine residues are dispensable.
  • The protease exhibits a preference for aromatic and hydrophobic amino acids at the P1' position.

    • Conclusions:

    • Specific determinants for MPP substrate cleavage include proximal and distal arginine residues, proline and/or glycine, and the P1' amino acid.
    • These findings provide critical insights into the substrate specificity of mitochondrial processing peptidase.