Top-down/Bottom-up Mass Spectrometry Workflow Using Dissolvable Polyacrylamide Gels.

Top-down/Bottom-up Mass Spectrometry Workflow Using Dissolvable Polyacrylamide Gels.
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DOI:
10.1021/acs.analchem.7b00357
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发表时间:
2017-08-15
影响因子:
7.4
通讯作者:
Loo JA
Loo JA
中科院分区:
化学1区
文献类型:
--
作者:
Takemori N;Takemori A;Wongkongkathep P;Nshanian M;Loo RRO;Lermyte F;Loo JA

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Biologists’ preeminent toolbox for separating, analyzing, and visualizing proteins is SDS-PAGE, yet recovering the proteins embedded in these polyacrylamide media as intact species is a long-standing challenge for mass spectrometry. In conventional workflows, protein mixtures from crude biological samples are electrophoretically separated at high-resolution within N,N′-methylene-bis-acrylamide crosslinked polyacrylamide gels to reduce sample complexity and facilitate sensitive characterization. However, low protein recoveries, especially for high molecular weight proteins, often hinder characterization by mass spectrometry. We describe a workflow for top-down/bottom-up mass spectrometric analyses of proteins in polyacrylamide slab gels using dissolvable, bis-acryloylcystamine-crosslinked polyacrylamide, enabling high-resolution protein separations while recovering intact proteins over a broad size range efficiently. The inferior electrophoretic resolution long associated with reducible gels has been overcome, as demonstrated by SDS-PAGE of crude tissue extracts. This workflow elutes intact proteins efficiently, supporting MS and MS/MS from proteins resolved on biologists’ preferred separation platform.
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