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Related Experiment Video

Updated: Jul 2, 2026

Isolation of Mitochondria for Mitochondrial Supercomplex Analysis from Small Tissue and Cell Culture Samples

Isolation of Mitochondria for Mitochondrial Supercomplex Analysis from Small Tissue and Cell Culture Samples

Published on: May 3, 2024

Subunit mass fingerprinting of mitochondrial complex I.

Nina Morgner¹, Volker Zickermann, Stefan Kerscher

¹Institute of Physical and Theoretical Chemistry, Johann Wolfgang Goethe-Universität, Frankfurt am Main, Germany.

Biochimica Et Biophysica Acta

|September 3, 2008

Summary

Laser induced liquid bead ion desorption (LILBID) mass spectrometry accurately identified respiratory chain complex I subunits from Yarrowia lipolytica. This method efficiently analyzes membrane-bound protein complexes, even from small samples.

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Area of Science:

Biochemistry
Proteomics
Mass Spectrometry

Background:

Respiratory chain complex I is a crucial membrane-bound multiprotein complex.
Understanding its subunit composition is vital for cellular respiration research.
Previous methods faced challenges in analyzing such large, hydrophobic complexes.

Purpose of the Study:

To determine the total mass and subunit composition of respiratory chain complex I from Yarrowia lipolytica.
To evaluate the utility of laser induced liquid bead ion desorption (LILBID) mass spectrometry for this purpose.
To demonstrate LILBID's capability in analyzing membrane-bound complexes from purified samples.

Main Methods:

Purification of respiratory chain complex I from Yarrowia lipolytica.
Analysis using laser induced liquid bead ion desorption (LILBID) mass spectrometry.
Comparison of observed ion masses with predicted protein masses for subunit identification.

Main Results:

Successfully assigned all 40 known subunits of complex I using LILBID.
Detected even highly hydrophobic subunits encoded by the mitochondrial genome.
Identified and corrected errors in genome-derived protein sequences, with masses within 100 Da of predicted values.
Demonstrated successful application of LILBID to complex I eluted from blue-native polyacrylamide gel electrophoresis.

Conclusions:

LILBID mass spectrometry is a powerful tool for subunit mass fingerprint analysis of large, membrane-bound protein complexes.
The method enables efficient proteomic analysis of complex I and its assembly intermediates.
LILBID significantly advances the study of complex biological assemblies, including both soluble and membrane-bound types.