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Related Concept Videos

Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

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Updated: Jun 5, 2026

Isolation and Respiratory Measurements of Mitochondria from Arabidopsis thaliana
09:54

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Published on: January 5, 2018

Proteomic approach to characterize mitochondrial complex I from plants.

Jennifer Klodmann1, Hans-Peter Braun

  • 1Institute for Plant Genetics, Faculty of Natural Sciences, Leibniz Universität Hannover, Herrenhäuser Str. 2, D-30419 Hannover, Germany. klodmann@genetik.uni-hannover.de

Phytochemistry
|December 21, 2010
PubMed
Summary

Plant mitochondrial complex I is larger than bovine complex I, featuring numerous unique subunits. Proteomic analysis reveals 47 distinct proteins, including plant-specific enzymes involved in vital functions like ascorbate biosynthesis.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Plant Science

Background:

  • Mitochondrial NADH dehydrogenase (complex I) is the largest respiratory chain enzyme, extensively studied in bovine mitochondria (45 subunits).
  • Previous studies on plant complex I composition were limited, necessitating a comprehensive proteomic exploration.

Purpose of the Study:

  • To review and present proteomic data on the protein constituents of plant mitochondrial complex I.
  • To provide a detailed proteomic re-evaluation of complex I's protein composition in plants, specifically Arabidopsis.

Main Methods:

  • Subunit separation using various gel electrophoresis techniques.
  • Protein identification through mass spectrometry.
  • Proteomic analysis of Arabidopsis complex I.

Main Results:

  • Arabidopsis complex I comprises 47 distinct protein types, exceeding the subunit count in bovine mitochondria.
  • An additional subunit, ND4L, was identified but not detected due to its unique biochemical properties.
  • Fifteen subunits are plant-specific, with some exhibiting known enzymatic functions like carbonic anhydrases and L-galactono-1,4-lactone dehydrogenase (GLDH).

Conclusions:

  • Plant complex I is significantly larger and more complex than previously understood, with numerous unique subunits.
  • The presence of plant-specific subunits suggests specialized roles in plant mitochondrial function and metabolism, including ascorbate biosynthesis.