High-sensitivity TFA-free LC-MS for profiling histones.

High-sensitivity TFA-free LC-MS for profiling histones.
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DOI:
10.1002/pmic.201000445
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发表时间:
2011-08
期刊:
影响因子:
3.4
通讯作者:
Freitas, Michael A.
Freitas, Michael A.
中科院分区:
生物学3区
文献类型:
--
作者:
You, Jia;Wang, Liwen;Saji, Motoyasu;Olesik, Susan V.;Ringel, Matthew D.;Lucas, David M.;Byrd, John C.;Freitas, Michael A.

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The analysis of proteins by reversed-phase liquid chromatography (RPLC) commonly involves the use of TFA as an ion-pairing agent, even though it forms adducts and suppresses sensitivity. The presence of adducts can complicate protein molecular weight assignment especially when protein isoforms coelute as in the case of histones. To mitigate the complicating effects of TFA adducts in protein LC-MS, we have optimized TFA-free methods for protein separation. Protein standards and histones were used to evaluate TFA-free separations using capillary (0.3 mm id) and nanoscale (0.1 mm id) C8 columns with the ion-pairing agents, formic acid or acetic acid. The optimized method was then used to examine the applicability of the approach for histone characterization in human cancer cell lines and primary tumor cells from chronic lymphocytic leukemia patients.
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