A robust two-dimensional separation for top-down tandem mass spectrometry of the low-mass proteome.

A robust two-dimensional separation for top-down tandem mass spectrometry of the low-mass proteome.
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DOI:
10.1016/j.jasms.2009.08.001
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发表时间:
2009-12
影响因子:
3.2
通讯作者:
Kelleher NL
Kelleher NL
中科院分区:
化学3区
文献类型:
--
作者:
Lee JE;Kellie JF;Tran JC;Tipton JD;Catherman AD;Thomas HM;Ahlf DR;Durbin KR;Vellaichamy A;Ntai I;Marshall AG;Kelleher NL

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For fractionation of intact proteins by molecular weight (MW), a sharply improved two-dimensional (2D) separation is presented to drive reproducible and robust fractionation before top-down mass spectrometry of complex mixtures. The “GELFrEE” (i.e., gel-eluted liquid fraction entrapment electrophoresis) approach is implemented by use of Tris-glycine and Tris-tricine gel systems applied to human cytosolic and nuclear extracts from HeLa S3 cells, to achieve a MW-based fractionation of proteins from 5 to >100 kDa in 1 h. For top-down tandem mass spectroscopy (MS/MS) of the low-mass proteome (5–25 kDa), between 5 and 8 gel-elution (GE) fractions are sampled by nanocapillary-LC-MS/MS with 12 or 14.5 tesla Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometers. Single injections give about 40 detectable proteins, about half of which yield automated ProSight identifications. Reproducibility metrics of the system are presented, along with comparative analysis of protein targets in mitotic versus asynchronous cells. We forward this basic 2D approach to facilitate wider implementation of top-down mass spectrometry and a variety of other protein separation and/or characterization approaches.
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