Rapid Enrichment of Phosphopeptides and Phosphoproteins from Complex Samples Using Magnetic Particles Coated with Alumina as the Concentrating Probes for MALDI MS Analysis
In this study, we used nanocomposite magnetic particles coated with alumina as the affinity probes to selectively concentrate phosphorylated peptides and proteins from a low volume of sample solution. Tryptic digest products of phosphoproteins including α- and β-caseins, human protein phosphatase in...
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Published in | Journal of proteome research Vol. 6; no. 1; pp. 316 - 325 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
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United States
American Chemical Society
01.01.2007
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Abstract | In this study, we used nanocomposite magnetic particles coated with alumina as the affinity probes to selectively concentrate phosphorylated peptides and proteins from a low volume of sample solution. Tryptic digest products of phosphoproteins including α- and β-caseins, human protein phosphatase inhibitor 1, nonfat milk, egg white, and a cell lysate were used as the samples to demonstrate the feasibility of this approach. In only 30 and 90 s, phosphopeptides and phosphoproteins sufficient for characterization by MALDI-MS were enriched by the particles, respectively. Proteins trapped on the particles could be directly digested on the particles. The same particles in the digest solution were employed for enrichment of phosphopeptides. We estimated the required time for performing the enrichment of phosphopeptides from complex samples and characterization by MALDI MS was within 5 min. A small volume (50 μL) and a low concentration (5 × 10-10 M) of tryptic digest product of a phosphoprotein sample could be dramatically enriched and characterized using this approach. Keywords: alumina • magnetic particles • phosphopeptides • phosphoproteins • MALDI MS |
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AbstractList | In this study, we used nanocomposite magnetic particles coated with alumina as the affinity probes to selectively concentrate phosphorylated peptides and proteins from a low volume of sample solution. Tryptic digest products of phosphoproteins including alpha and beta-caseins, human protein phosphatase inhibitor 1, nonfat milk, egg white, and a cell lysate were used as the samples to demonstrate the feasibility of this approach. In only 30 and 90 s, phosphopeptides and phosphoproteins sufficient for characterization by MALDI-MS were enriched by the particles, respectively. Proteins trapped on the particles could be directly digested on the particles. The same particles in the digest solution were employed for enrichment of phosphopeptides. We estimated the required time for performing the enrichment of phosphopeptides from complex samples and characterization by MALDI MS was within 5 min. A small volume (50 microL) and a low concentration (5 x 10(-10) M) of tryptic digest product of a phosphoprotein sample could be dramatically enriched and characterized using this approach. In this study, we used nanocomposite magnetic particles coated with alumina as the affinity probes to selectively concentrate phosphorylated peptides and proteins from a low volume of sample solution. Tryptic digest products of phosphoproteins including α- and β-caseins, human protein phosphatase inhibitor 1, nonfat milk, egg white, and a cell lysate were used as the samples to demonstrate the feasibility of this approach. In only 30 and 90 s, phosphopeptides and phosphoproteins sufficient for characterization by MALDI-MS were enriched by the particles, respectively. Proteins trapped on the particles could be directly digested on the particles. The same particles in the digest solution were employed for enrichment of phosphopeptides. We estimated the required time for performing the enrichment of phosphopeptides from complex samples and characterization by MALDI MS was within 5 min. A small volume (50 μL) and a low concentration (5 × 10-10 M) of tryptic digest product of a phosphoprotein sample could be dramatically enriched and characterized using this approach. Keywords: alumina • magnetic particles • phosphopeptides • phosphoproteins • MALDI MS |
Author | Chen, Wei-Yu Chen, Yu-Chie Tsai, Pei-Jane Chien, Kun-Yi Yu, Jau-Song Chen |
Author_xml | – sequence: 1 surname: Chen fullname: Chen – sequence: 2 givenname: Wei-Yu surname: Chen fullname: Chen, Wei-Yu – sequence: 3 givenname: Pei-Jane surname: Tsai fullname: Tsai, Pei-Jane – sequence: 4 givenname: Kun-Yi surname: Chien fullname: Chien, Kun-Yi – sequence: 5 givenname: Jau-Song surname: Yu fullname: Yu, Jau-Song – sequence: 6 givenname: Yu-Chie surname: Chen fullname: Chen, Yu-Chie |
BackLink | https://www.ncbi.nlm.nih.gov/pubmed/17203975$$D View this record in MEDLINE/PubMed |
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SubjectTerms | Aluminum Oxide - chemistry Amino Acid Sequence Carcinoma, Squamous Cell - metabolism Caseins - chemistry Cell Line, Tumor Humans Magnetics Molecular Sequence Data Peptide Mapping Phosphopeptides - chemistry Phosphoproteins - chemistry Protein Denaturation Proteomics - methods Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization - instrumentation Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization - methods Trypsin - chemistry |
Title | Rapid Enrichment of Phosphopeptides and Phosphoproteins from Complex Samples Using Magnetic Particles Coated with Alumina as the Concentrating Probes for MALDI MS Analysis |
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