期刊
ANALYTICA CHIMICA ACTA
卷 982, 期 -, 页码 200-208出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2017.06.007
关键词
Free-flow electrophoresis; Isoelectric focusing; Mitochondria; Purification; Proteomics
资金
- National Natural Science Foundation of China [21675110, 21475086, 21305087, 21275099]
- National Key Development of Scientific Instruments [2011YQ030139]
- Key Scientific Project of Shanghai Jiao Tong University [YG2013MS10, YG2014QN21, YG2015MS48]
- Recruitment Program of Global Youth Experts of China and National High-tech R&D Program of China [2014AA020545]
- NIH [R56NS074763, RO1AG033004]
Mitochondria play essential roles in both energy metabolism and cell signaling, which are critical for cell survival. Although significant efforts have been invested in understanding mitochondrial biology, methods for intact mitochondria preparation are technically challenging and remain to be improved. New methods for heterogeneous mitochondria purification will therefore boost our understanding on their physiological and biophysical properties. Herein, we developed a novel recycling free-flow isoelectric focusing (RFFIEF) with post-pH gradient sample injection (post-PGSI) for preparative separation of mitochondria. Crude mitochondria of rabbit liver obtained from differential centrifugation were purified by the developed method according to their pI values as six fractions. Transmission electron microscope images revealed that intact mitochondria existed in two fractions of pH 6.24 and 6.61, degenerative mitochondria were in two fractions of pH 5.46 and 5.72, and inner membrane vesicles (IMVs) appeared in the fractions of pH 4.70 and 5.04. Membrane potential measurement proved a dramatic difference between intact mitochondria and IMVs, which reflected the bioactivity of obtained populations. Particularly, proteomics analyses revealed that more number of proteins were identified in the intact fractions than that of IMVs or crude mitochondria, which demonstrated that RFFIEF could be powerful tool for the preparation of intact organelle as well as their proteomic and in-depth biological analysis. (C) 2017 Elsevier B.V. All rights reserved.
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