Subscriber access provided by University of Groningen
Article
Phosphotyrosine biased enrichment of tryptic peptides from cancer cells by combining pY-MIP and TiO2 affinity resins Loreta Bllaci, Silje Bøen Torsetnes, Celina Katarzyna Wierzbicka, Sudhirkumar Shinde, Börje Sellergren, Adelina Rogowska-Wrzesinska, and Ole Nørregaard Jensen Anal. Chem., Just Accepted Manuscript • DOI: 10.1021/acs.analchem.7b02091 • Publication Date (Web): 03 Oct 2017 Downloaded from http://pubs.acs.org on October 5, 2017
Just Accepted “Just Accepted” manuscripts have been peer-reviewed and accepted for publication. They are posted online prior to technical editing, formatting for publication and author proofing. The American Chemical Society provides “Just Accepted” as a free service to the research community to expedite the dissemination of scientific material as soon as possible after acceptance. “Just Accepted” manuscripts appear in full in PDF format accompanied by an HTML abstract. “Just Accepted” manuscripts have been fully peer reviewed, but should not be considered the official version of record. They are accessible to all readers and citable by the Digital Object Identifier (DOI®). “Just Accepted” is an optional service offered to authors. Therefore, the “Just Accepted” Web site may not include all articles that will be published in the journal. After a manuscript is technically edited and formatted, it will be removed from the “Just Accepted” Web site and published as an ASAP article. Note that technical editing may introduce minor changes to the manuscript text and/or graphics which could affect content, and all legal disclaimers and ethical guidelines that apply to the journal pertain. ACS cannot be held responsible for errors or consequences arising from the use of information contained in these “Just Accepted” manuscripts.
Analytical Chemistry is published by the American Chemical Society. 1155 Sixteenth Street N.W., Washington, DC 20036 Published by American Chemical Society. Copyright © American Chemical Society. However, no copyright claim is made to original U.S. Government works, or works produced by employees of any Commonwealth realm Crown government in the course of their duties.
Page 1 of 11
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60
Analytical Chemistry
Phosphotyrosine biased enrichment of tryptic peptides from cancer cells by combining pY-MIP and TiO2 affinity resins Loreta Bllaci,§# Silje B. Torsetnes,‡§# Celina Wierzbicka,¶ Sudhirkumar Shinde,¶ Börje Sellergren,¶ Adelina Rogowska-Wrzesinska, § and Ole N. Jensen∗ § §
Department of Biochemistry and Molecular Biology and VILLUM Center for Bioanalytical Sciences, University of Southern Denmark, DK-5230 Odense M, Denmark ¶
Department of Biomedical Sciences, Malmö University, S-20506 Malmö, Sweden
ABSTRACT: Protein phosphorylation at distinct tyrosine residues (pY) is essential for fast, specific and accurate signal transduction in cells. Enrichment of pY-containing peptides derived from phosphoproteins is commonly facilitated by use of immobilized anti-pY antibodies prior to phosphoproteomics analysis by mass spectrometry. We here report on an alternative approach for pY-peptide enrichment using inexpensive pY imprinted polymer (pY-MIP). We assessed by mass spectrometry the performance of pY-MIP for enrichment and sequencing of phosphopeptides obtained by tryptic digestion of protein extracts from HeLa cells. The combination of pY-MIP and TiO2 based phosphopeptide enrichment provided more than 90% selectivity for phosphopeptides. Mass spectrometry signal intensities were enhanced for most pYphosphopeptides (approximately 70%) when using the pY-MIP-TiO2 combination as compared to TiO2 alone. pY constituted up to 8% of the pY-MIP-TiO2 enriched phosphopeptide fractions. The pY-MIP-TiO2 and the TiO2 protocols yielded comparable numbers of distinct phosphopeptides, 1693 and 1842 respectively, from microgram levels of peptide samples. Detailed analysis of physicochemical properties of pY-MIP-TiO2 enriched phosphopeptides demonstrated that this protocol retrieved phosphopeptides that tend to be smaller (
