Extraction, Enrichment, Solubilization, and Digestion Techniques for Membrane Proteomics

详细信息    查看全文

• 作者：Stephanie M. Moore ; Stephanie M. Hess ; James W. Jorgenson
• 刊名：Journal of Proteome Research
• 出版年：2016
• 出版时间：April 1, 2016
• 年：2016
• 卷：15
• 期：4
• 页码：1243-1252
• 全文大小：457K
• ISSN：1535-3907

文摘

The importance of membrane proteins in biological systems is indisputable; however, their amphipathic nature makes them difficult to analyze. In this study, the most popular techniques for extraction, enrichment, solubilization, and digestion are compared, resulting in an overall improved workflow for the insoluble portion of Saccharomyces cerevisiae cell lysate. Yeast cells were successfully lysed using a French press pressure cell at 20 000 psi, and resulting proteins were fractionated prior to digestion to reduce sample complexity. The proteins were best solubilized with the addition of ionic detergent sodium deoxycholate (1%) and through the application of high-frequency sonication prior to a tryptic digestion at 37 °C. Overall, the improved membrane proteomic workflow resulted in a 26% increase in membrane protein identifications for baker’s yeast. In addition, more membrane protein identifications were unique to the improved protocol. When comparing membrane proteins that were identified in the improved protocol and the standard operating procedure (176 proteins), 93% of these proteins were present in greater abundance (higher intensity) when using the improved method.