High throughput analysis of vacuolar acidification.

Area of Science:

• Cell Biology
• Biochemistry
• Molecular Biology

Background:

• Eukaryotic cells utilize membrane-bound organelles with distinct lumenal pH for specialized functions.
• Vacuolar-type H+-ATPase (V-ATPase) regulates lumenal pH in the endocytic and secretory pathways.
• Lysosome acidification, crucial for macromolecule breakdown and disease, is V-ATPase-dependent.

Purpose of the Study:

• To develop a high-throughput screening method for V-ATPase activity modulators.
• To enable real-time measurement of vacuolar acidification using a fluorescent reporter.
• To facilitate the study of V-ATPase regulation and its link to diseases.

Main Methods:

• Utilized Acridine Orange as a fluorescent reporter for acidified yeast vacuoles.
• Developed a high-throughput assay adaptable to 96-well and 384-well plate formats.
• Measured real-time acidification of purified yeast vacuoles.

Main Results:

• Established a cost-effective and time-efficient method for screening V-ATPase modulators.
• Demonstrated the ability to measure vacuolar acidification in reduced reagent volumes.
• Enabled rapid assessment of V-ATPase activity in various conditions.

Conclusions:

• The developed Acridine Orange-based assay is a powerful tool for high-throughput screening of V-ATPase inhibitors and activators.
• This method significantly reduces reagent costs and assay time compared to traditional methods.
• Facilitates research into V-ATPase function, regulation, and therapeutic targeting for associated diseases.