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ENRICHMENT AND DETECTION METHODOLOGIES FOR EGFR PHOSPHOPEPTIDES

EGFR 磷酸肽的富集和检测方法

基本信息

批准号：
8365555
负责人：
Vickery E Trinkaus-Randall
金额：
$ 5.08万
依托单位：
BOSTON UNIVERSITY MEDICAL CAMPUS
依托单位国家：
美国
项目类别：
财政年份：
2011
资助国家：
美国
起止时间：
2011-06-01 至 2012-08-09
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/8365555
关键词：
Affinity Chromatography Antibodies Biological Biology Cations Cell Line Cells Chromatography Complex Cornea Coupled Cytolysis Detection EGF gene Electrostatics Epidermal Growth Factor Receptor Epithelial Cells Exposure to Fractionation Funding Grant Human Immunoprecipitation Link Mass Spectrum Analysis Medicine Metals Methodology Methods Monitor National Center for Research Resources Peptides Phosphopeptides Phosphoproteins Phosphorylation Phosphorylation Site Phosphoserine Phosphothreonine Phosphotyrosine Play Principal Investigator Protease Inhibitor Protein Tyrosine Kinase Proteins Research Research Infrastructure Resources Role Sampling Signal Pathway Source Specificity Stable Isotope Labeling Stimulus Trypsin Tyrosine Tyrosine Phosphorylation United States National Institutes of Health Urea Water base cell growth cell injury cost limbal liquid chromatography mass spectrometry migration phosphatase inhibitor research study response reversed phase chromatography stoichiometry titanium dioxide tool zirconium oxide

项目摘要

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. Primary support for the subproject and the subproject's principal investigator may have been provided by other sources, including other NIH sources. The Total Cost listed for the subproject likely represents the estimated amount of Center infrastructure utilized by the subproject, not direct funding provided by the NCRR grant to the subproject or subproject staff. Epidermal growth factor receptor (EGFR) tyrosine kinase plays an important role in regulating cell growth, proliferation, and migration. Differential phosphorylation of specific tyrosine residues in EGFR in response to diverse external stimuli (e.g., exposure to EGF, ATP, cell injury, etc.) serves as the key link between these stimuli and the internal signaling pathways that they activate. EGFR phosphosite-specific antibodies have been used as highly sensitive tools to monitor phosphorylation site occupancy, however, they suffer from a lack of specificity. Recently, highly sensitive mass spectrometric-based detection strategies have been described to characterize the EGFR tyrosine phosphorylation cascade under a variety of conditions. Currently, many phosphopeptide enrichment methods are in use, including immunoprecipitation of phosphoproteins/peptides with specific antibodies, strong cation exchange chromatography, electrostatic repulsion hydrophilic interaction chromatography, immobilized metal affinity chromatography, zirconium dioxide and titanium dioxide chromatography. Used independently, each of these methods does increase the efficiency of detection for phosphopeptides;each has advantages and limitations. Combining different phosphopeptide enrichment methods is, therefore, crucial for a more comprehensive detection of phosphopeptides in complex biological samples. In our most recent experiments, Human Corneal Limbal Epithelial cell lines (HCLEs) were grown to confluence, stimulated with EGF, and lysed with 8M urea supplemented with phosphatase and protease inhibitors. For quantitative phosphorylation analyses, stable isotope-labeled cells were used. An average of 10 mg total protein was reduced, alkylated and digested with trypsin. Peptides were desalted with SepPak C18 reversed phase chromatography. Phosphotyrosine peptides were immunoprecipitated using a combination of three anti-phosphotyrosine antibodies. The flow-through was further fractionated with either electrostatic repulsion hydrophilic interaction chromatography (ERLIC) or strong cation exchange (SCX) chromatography. Fractions were further phosphoenriched using immobilized metal affinity chromatography (IMAC) and analyzed by LC/MSn using a nanoAcuity UPLC (Waters) coupled through a TriVersa NanoMate (Advion) to an LTQ-Orbitrap MS (Thermo-Fisher). When employed alone, SCX chromatographic fractionation of samples, resulted in low detection efficiency for phosphopeptides. The relatively high amount of non-phosphopeptides in the SCX fractions outcompeted the phosphopeptides for detection. Further phospho-based enrichment of the SCX fractions with either IMAC or TiO2 chromatography eliminated most of the non-phosphopeptides and significantly increased detection efficiency for the phosphopeptides. In a parallel experiment, we fractionated peptides using ERLIC and analyzed the resulting fractions directly by LC/MS/MS. ERLIC alone provided significantly increased detection of phosphopeptides. Given the low stoichiometry of phosphotyrosine compared to phosphoserine or phosphothreonine in biological samples, however, their detection level of remains a challenge. Further reasearch is presently underway to increase the detection efficiency for phosphotyrosine peptides. Our current approach employs immunoprecipitation of phosphotyrosine peptides prior to fractionation by either SCX or ERLIC. The flow-through is then divided in to two and fractionated further - one half is subjected to SCX and the other half to ERLIC. All the immunoprecipitated peptides, the SCX and ERLIC fractions are further phosphoenriched using IMAC before LC/MSn analysis.

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