Facilitating the hyphenation of CIEF and MALDI-MS for two-dimensional separation of proteins.

Facilitating the hyphenation of CIEF and MALDI-MS for two-dimensional separation of proteins.
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DOI:
10.1002/elps.201000085
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发表时间:
2010-08
期刊:
影响因子:
2.9
通讯作者:
Liu, Shaorong
Liu, Shaorong
中科院分区:
生物学3区
文献类型:
--
作者:
Cheng, Chang;Lu, Joann J.;Wang, Xiayan;Roberts, Jonathan;Liu, Shaorong
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Both CIEF and MALDI-MS are frequently used in protein analysis, but hyphenation of the two is not investigated proportionally. One of the major reasons is that the additives (such as carrier ampholytes and detergent) in CIEF severely suppress the MALDI-MS signal, which hampers the hyphenation of the two. In this paper, we develop a simple means to alleviate the above signal-suppressing effect. We first deposit 1 µL of water onto a MALDI-MS target, deliver a fraction of CIEF-separated protein (~0.1 µL) to the water droplet, evaporate the solvent, add 0.5 µL of MALDI matrix to the sample spot, dry the matrix, and move the target plate to a MALDI-TOF-MS for mass spectrum measurement. We optimize the droplet volume and the laser-ablation region. Under the optimized conditions, we improve the signal to noise ratio by 2–10 fold. We also apply this method for two-dimensional separations of standard proteins and Apolipoprotein A-I, a membrane protein expressed in E. Coli cells.
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