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Toward high sequence coverage of proteins in human breast cancer cells using on‐line monolith‐based HPLC‐ESI‐TOF MS compared to CE MS
Author(s) -
Yoo Chul,
Pal Manoj,
Miller Fred R.,
Barder Timothy J.,
Huber Christian,
Lubman David M.
Publication year - 2006
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.200500651
Subject(s) - chromatography , monolithic hplc column , fractionation , high resolution , monolith , human breast , chemistry , sequence (biology) , peptide , high performance liquid chromatography , divinylbenzene , resolution (logic) , lysis , materials science , analytical chemistry (journal) , styrene , breast cancer , cancer , biology , computer science , biochemistry , polymer , remote sensing , organic chemistry , copolymer , genetics , geology , catalysis , artificial intelligence
A method is developed toward high sequence coverage of proteins isolated from human breast cancer MCF10 cell lines using a 2‐D liquid separations. Monolithic‐capillary columns prepared by copolymerizing styrene with divinylbenzene are used to achieve high‐resolution separation of peptides from protein digests. This separation is performed with minimal sample preparation directly from the 2‐D liquid fractionation of the cell lysate. The monolithic column separation is directly interfaced to ESI‐TOF MS to obtain a peptide map. The protein digests were also analyzed by MALDI‐TOF MS and an accurate M r of the intact protein was obtained using an HPLC‐ESI‐TOF MS. The result is that these techniques provide complementary information where nearly complete sequence coverage of the protein is obtained and can be compared to the experimental M r value. The high sequence coverage provides information on isoforms and other post‐translational modifications that would not be available from methods that result in low sequence coverage. The results from the use of monolithic columns are compared to that obtained by CE‐MS. The monolithic column separations provide a rugged and highly reproducible method for separating protein digests prior to MS analysis and is suited to confidently identify biomarkers associated with cancer progression.