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Membrane-Assisted Isoelectric Focusing Device As a Micropreparative Fractionator for Two-Dimensional Shotgun Proteomics.

Authors :
Pirmoradian, Mohammad
Bo Zhang
Chingin, Konstantn
Astorga-Wells, Juan
Zubarev, Roman A.
Source :
Analytical Chemistry. 6/17/2014, Vol. 86 Issue 12, p5728-5732. 5p.
Publication Year :
2014

Abstract

Recently, we introduced an online multijunction capillary isoelectric focusing (OMJ-CIEF) fractionator to fractionate proteins and peptides in electrospray-friendly solution. In this follow-up study, the original configuration of the fractionator was modified to improve the resolving power and reproducibility of separation. The major improvements include stabilization of the electrical current through the device using a voltage divider and stepwise elution of peptide zones in conjunction with the repeated refocusing of remaining peptides. Also, a novel algorithm was developed to calculate more accurately the pi values of peptides identified from experimental data. The standard deviation of calculated pi values for unmodified peptides from the theoretically predicted pi values was on average 0.21 pH units, which is more accurate than in standard-resolution gel-based methods. In order to characterize the analytical performance of the improved device, it was applied for the pi fractionation of yeast proteome digest into 18 fractions, with the collected fractions being analyzed by reverse-phase liquid chromatography coupled with tandem mass spectrometry. Approximately 37% of 20047 identified peptides were detected in only one fraction and 27% - in two fractions. On average, every peptide was found in 2.4 fractions. These results strongly indicate the suitability of the improved device as a first dimension of separation in multidimensional shotgun proteomics analysis, with a potential for fully automated workflow. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00032700
Volume :
86
Issue :
12
Database :
Academic Search Index
Journal :
Analytical Chemistry
Publication Type :
Academic Journal
Accession number :
97103628
Full Text :
https://doi.org/10.1021/ac404180e