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Related Experiment Videos

Acidosomes from Dictyostelium. Initial biochemical characterization.

K V Nolta1, H Padh, T L Steck

  • 1Department of Biochemistry and Molecular Biology, University of Chicago, Illinois 60637.

The Journal of Biological Chemistry
|September 25, 1991
PubMed
Summary
This summary is machine-generated.

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The acidosome, a unique Dictyostelium discoideum organelle, efficiently acidifies vacuoles using proton pumps. This biochemically distinct organelle, separate from other endomembranes, plays a key role in cellular processes.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The acidosome is a newly identified organelle in Dictyostelium discoideum.
  • It plays a crucial role in the acidification of endocytic vacuoles.

Purpose of the Study:

  • To biochemically characterize the acidosome and its associated vacuolar proton pumps (V-H(+)-ATPases).
  • To determine the purity and composition of isolated acidosomes.
  • To investigate the structure and properties of the V-H(+)-ATPase within acidosomes.

Main Methods:

  • Organelle purification and biochemical analysis.
  • Enzyme activity assays for proton pump function.
  • Gel electrophoresis and densitometry for protein composition analysis.
  • Lipid analysis of purified acidosomes.

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Main Results:

  • Purified acidosomes showed minimal contamination from other organelles.
  • The specific activity of the V-H(+)-ATPase in acidosomes was the highest reported to date.
  • The V-H(+)-ATPase was the predominant protein, with a defined subunit composition and stoichiometry.
  • Acidosomes exhibited unique lipid profiles, with high levels of phosphatidylcholine and phosphatidylserine.

Conclusions:

  • The acidosome is a biochemically discrete organelle in Dictyostelium discoideum.
  • It is distinct from other endomembranes and the plasma membrane.
  • The acidosome is produced by the endoplasmic reticulum/Golgi apparatus and contributes significantly to cellular protein and phospholipid content.