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Differential recovery of membrane proteins after extraction by aqueous methanol and trifluoroethanol
Huoming Zhang1, Qingsong Lin, Sukumar Ponnusamy
1Department of Obstetrics and Gynaecology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.
Abstract:
Cell membrane proteome analysis is limited by inherent membrane hydrophobicity. Conventional membrane protein extraction techniques use detergents, chaotropes and organic acids that require sample clean-up or pH adjustment, and are associated with significant sample loss. We extracted membrane proteins from red blood cells (RBCs) using methanol (MeOH), trifluoroethanol (TFE) and urea, and identified membrane proteins using 2-D LC coupled with MALDI-TOF/TOF-MS. We show that organic solvents MeOH- and TFE-based methods have membrane protein analysis efficiencies comparable to urea, and are complementary for the recovery of both hydrophilic and hydrophobic peptides. The mean grand average of hydropathicity (GRAVY) value of identified peptides from the TFE-based method (-0.107) was significantly higher than that of the MeOH-based method (-0.465) (p<0.001). Sequential and adjunctive use of the organic solvents MeOH and TFE increases the number of proteins identified, and the confidence of their identification. We show that this strategy is effective for shotgun membrane proteome analysis.
Insights
This study introduces organic solvents like methanol and trifluoroethanol for red blood cell membrane protein extraction, offering an efficient alternative to conventional methods for comprehensive proteome analysis.
Area of Science:
- Biochemistry
- Proteomics
- Analytical Chemistry
Background:
- Cell membrane proteome analysis is challenging due to membrane protein hydrophobicity.
- Conventional extraction methods often involve detergents or harsh chemicals, leading to sample loss and complex procedures.
Purpose of the Study:
- To evaluate organic solvents (methanol and trifluoroethanol) as alternatives for membrane protein extraction.
- To compare the efficiency of organic solvent-based methods with conventional urea extraction.
- To assess the complementarity of organic solvents for recovering diverse peptides.
Main Methods:
- Extraction of membrane proteins from red blood cells (RBCs) using methanol (MeOH), trifluoroethanol (TFE), and urea.
- Identification of membrane proteins using two-dimensional liquid chromatography (2-D LC) coupled with MALDI-TOF/TOF-MS.
- Analysis of peptide hydrophobicity using grand average of hydropathicity (GRAVY) values.
Main Results:
- MeOH- and TFE-based methods demonstrated comparable efficiency to urea for membrane protein extraction.
- Organic solvents recovered both hydrophilic and hydrophobic peptides, showing complementary roles.
- TFE-based extraction yielded peptides with significantly higher GRAVY values compared to MeOH-based extraction.
- Sequential and combined use of MeOH and TFE enhanced the number and confidence of protein identifications.
Conclusions:
- Organic solvents (MeOH and TFE) provide an effective and complementary strategy for shotgun membrane proteome analysis.
- These methods offer an alternative to conventional techniques, potentially reducing sample loss and simplifying procedures.
- The combination of MeOH and TFE is particularly effective for maximizing protein identification in membrane proteome studies.
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