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Published on: May 27, 2021
Differential dynamics of membrane proteins in yeast
Sourav Ganguly1, Pushpendra Singh, Raman Manoharlal
1Centre for Cellular and Molecular Biology, Council of Scientific and Industrial Research, Hyderabad, Andhra Pradesh, India.
Biochemical and Biophysical Research Communications
|July 21, 2009
Summary
Lateral diffusion of membrane proteins in yeast is slow. This study compared the dynamics of Candida drug resistance protein-1 (Cdr1p) and the human serotonin(1A) receptor (5-HT(1A)R), finding distinct mobility patterns influenced by membrane composition and cytoskeleton interactions.
Area of Science:
- Cell Biology
- Biophysics
- Membrane Protein Dynamics
Background:
- Lateral diffusion of lipids and proteins in yeast plasma membranes is anomalously slow, potentially contributing to yeast polarization.
- Understanding membrane protein dynamics is crucial for comprehending cellular functions and responses.
Purpose of the Study:
- To investigate the lateral diffusion of two distinct membrane proteins, Candida drug resistance protein-1 (Cdr1p) and the human serotonin(1A) receptor (5-HT(1A)R), in yeast plasma membranes.
- To elucidate factors influencing membrane protein mobility in yeast, including ergosterol levels and actin cytoskeleton integrity.
Main Methods:
- Utilized fluorescence recovery after photobleaching (FRAP) to measure the lateral mobility of Cdr1p-GFP and 5-HT(1A)R-EYFP in live yeast cells.
- Manipulated yeast cell membranes through ergosterol depletion and actin cytoskeleton destabilization to assess their impact on protein diffusion.
Main Results:
- Cdr1p-GFP exhibited slow lateral diffusion, whereas 5-HT(1A)R-EYFP showed significantly faster mobility.
- Ergosterol depletion increased 5-HT(1A)R-EYFP mobility but did not affect Cdr1p-GFP mobility.
- Actin cytoskeleton destabilization increased the mobile fraction of 5-HT(1A)R-EYFP but left Cdr1p-GFP mobility unaltered.
Conclusions:
- The study provides the first report on the dynamics of the drug resistance protein Cdr1p in yeast membranes.
- Differential mobility of Cdr1p and 5-HT(1A)R suggests distinct mechanisms of membrane anchoring and regulation in yeast.
- Findings offer novel insights into the factors governing membrane protein diffusion and behavior in yeast.
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