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Jiang Y, Liang W, Wang B, Feng Q, Xia C, Wang Q, Yan Y, Zhao L, Cui W, Liang H. Magnetic mesoporous silica nanoparticles modified by phosphonate functionalized ionic liquid for selective enrichment of phosphopeptides. RSC Adv 2022; 12:26859-26865. [PMID: 36320858 PMCID: PMC9490807 DOI: 10.1039/d2ra04609a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2022] [Accepted: 09/12/2022] [Indexed: 11/30/2022] Open
Abstract
In this study, new magnetic nanoparticles (denotated as Fe3O4@mSiO2-PFIL-Ti4+) have been prepared by immobilizing titanium ions with phosphonate functionalized ionic liquid (PFIL) on the wall of core–shell structured mesoporous nanomaterials. The resulting nanoparticles possess large specific surface area, strong hydrophilicity and fast magnetic response. The composites can capture traces of phosphopeptides from the tryptic β-casein digest (0.08 fmol), a digest mixture of β-casein and BSA (1 : 10 000, molar ratio) as well as a blend of β-casein digest and a great quantity of phosphorylated protein (β-casein) and non-phosphorylated protein (BSA) (1 : 2000 : 2000, mass ratio), respectively, showing excellent sensitivity, selectivity and size exclusion ability. Additionally, Fe3O4@mSiO2-PFIL-Ti4+ shows excellent steadiness and can be reused at least 12 times. Moreover, this material was successfully applied to enrich endogenous phosphopeptides from complex bio-samples, including human saliva and serum. A new magnetic IMAC core–shell nanomaterial (Fe3O4@mSiO2-PFIL-Ti4+) modified with phosphonate functionalized ionic liquid (PFIL) has been prepared and exhibits excellent specific enrichment of phosphopeptides.![]()
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Affiliation(s)
- Yufei Jiang
- Key Laboratory of Advanced Mass Spectrometry and Molecular Analysis of Zhejiang Province, School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
| | - Weida Liang
- Key Laboratory of Advanced Mass Spectrometry and Molecular Analysis of Zhejiang Province, School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
| | - Binbin Wang
- Key Laboratory of Advanced Mass Spectrometry and Molecular Analysis of Zhejiang Province, School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
| | - Quanshou Feng
- Key Laboratory of Advanced Mass Spectrometry and Molecular Analysis of Zhejiang Province, School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
| | - Chenglong Xia
- Key Laboratory of Advanced Mass Spectrometry and Molecular Analysis of Zhejiang Province, School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
| | - Qiyao Wang
- Ningbo Key Laboratory of Behaviour Neuroscience, Zhejiang Province Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo 315211, China
| | - Yinghua Yan
- Key Laboratory of Advanced Mass Spectrometry and Molecular Analysis of Zhejiang Province, School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
| | - Lingling Zhao
- Key Laboratory of Advanced Mass Spectrometry and Molecular Analysis of Zhejiang Province, School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
| | - Wei Cui
- Ningbo Key Laboratory of Behaviour Neuroscience, Zhejiang Province Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo 315211, China
| | - Hongze Liang
- Key Laboratory of Advanced Mass Spectrometry and Molecular Analysis of Zhejiang Province, School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
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Ohara K, Hayashi Y, Yamaguchi K. Laser Desorption Ionization-Mass Spectrometry of Linear Diphenylenes Encapsulated in Crystalline Sponge. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2020. [DOI: 10.1246/bcsj.20200062] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Kazuaki Ohara
- Faculty of Pharmaceutical Sciences at Kagawa Campus, Tokushima Bunri University, 1314-1 Shido, Sanuki, Kagawa 769-2193, Japan
| | - Yukako Hayashi
- Faculty of Pharmaceutical Sciences at Kagawa Campus, Tokushima Bunri University, 1314-1 Shido, Sanuki, Kagawa 769-2193, Japan
| | - Kentaro Yamaguchi
- Faculty of Pharmaceutical Sciences at Kagawa Campus, Tokushima Bunri University, 1314-1 Shido, Sanuki, Kagawa 769-2193, Japan
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Thawornpan P, Thanapongpichat S, Tun AW, Phongdara A, de Jong L, Buncherd H. Fly-ash as a low-cost material for isolation of phosphoproteins. CHEMOSPHERE 2018; 213:124-132. [PMID: 30216812 DOI: 10.1016/j.chemosphere.2018.08.150] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Revised: 08/27/2018] [Accepted: 08/29/2018] [Indexed: 06/08/2023]
Abstract
Metal oxide affinity chromatography (MOAC) is one of the most commonly used techniques for selective isolation phosphoproteins and phosphopeptides. This technique is capable of capturing the phosphorylated biomolecules through the affinity of the phosphoryl group for metal oxides/hydroxides. Fly-ash (FA), a by-product of coal-combustion power plants, is primarily composed of oxides of silicon and metals, among which iron and titanium. A number of studies have demonstrated the potential of these metal oxides for phosphoprotein and phosphopeptide enrichment. FA is annually produced over hundred million tons worldwide and generally considered as hazardous waste. It is thus of great importance to enhance its utilization. Here we present the first demonstration of the utility of FA as a low-cost MOAC material for the enrichment of phosphoproteins. With an FA-microcolumn, phosphoproteins can be successfully sequestered from other proteins. FA-microcolumns are shown to be simple, cheap and selective devices for phosphoprotein enrichment from a small volume of mixtures.
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Affiliation(s)
- Pongsakorn Thawornpan
- Department of Molecular Biotechnology and Bioinformatics, Faculty of Science, Prince of Songkla University, Songkhla, Thailand
| | | | - Aung Win Tun
- Faculty of Graduate Studies, Mahidol University, Thailand
| | - Amornrat Phongdara
- Faculty of Medical Technology, Prince of Songkla University, Songkhla, Thailand; Center for Genomics and Bioinformatics Research, Faculty of Science, Prince of Songkla University, Songkhla, Thailand
| | - Luitzen de Jong
- Swammerdam Institute for Life Sciences, University of Amsterdam, Science Park 904, 1090 GE Amsterdam, the Netherlands
| | - Hansuk Buncherd
- Faculty of Medical Technology, Prince of Songkla University, Songkhla, Thailand.
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Tsao CW, Lin YJ, Chen PY, Yang YL, Tan SH. Nanoscale silicon surface-assisted laser desorption/ionization mass spectrometry: environment stability and activation by simple vacuum oven desiccation. Analyst 2018; 141:4973-81. [PMID: 27315049 DOI: 10.1039/c6an00659k] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Nanoscale silicon surface-assisted laser desorption/ionization mass spectrometry (SALDI-MS) is an emerging matrix-free, highly sensitive MS analysis method. An important challenge in using nanoscale silicon SALDI-MS analysis is the aging and stability of silicon after storage in various environments. No proper nanoscale silicon SALDI-MS activation procedure has been reported to solve this issue. This study investigated the sensitivity, wettability, and surface oxidation behavior of nanoscale silicon surface SALDI-MS in a room, an inert gas atmosphere, and a vacuum environment. A simple vacuum oven desiccation was proposed to activate the SALDI-MS surface, and the limit of detection was further enhanced 1000 times to a 500 attomole level using this approach. The long-term stability and desorption/ionization mechanism were also investigated.
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Affiliation(s)
- Chia-Wen Tsao
- Department of Mechanical Engineering, National Central University, No. 300, Zhongda Rd., Taoyuan, Taiwan.
| | - Yuan-Jing Lin
- Department of Mechanical Engineering, National Central University, No. 300, Zhongda Rd., Taoyuan, Taiwan.
| | - Pi-Yu Chen
- Agricultural Biotechnology Research Center, Academia Sinica, 128 Academia Road, Taipei, Taiwan
| | - Yu-Liang Yang
- Agricultural Biotechnology Research Center, Academia Sinica, 128 Academia Road, Taipei, Taiwan
| | - Say Hwa Tan
- Queensland Micro- and Nanotechnology Centre, Griffith University, 170 Kessels Road, Brisbane, Australia
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Hayashi Y, Ohara K, Taki R, Saeki T, Yamaguchi K. Combined analysis of 1,3-benzodioxoles by crystalline sponge X-ray crystallography and laser desorption ionization mass spectrometry. Analyst 2018; 143:1475-1481. [DOI: 10.1039/c7an01906h] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The combination of X-ray analysis and laser desorption ionization by using crystalline sponge will be a promising method to determine guest structures.
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Affiliation(s)
- Yukako Hayashi
- Faculty of Pharmaceutical Sciences at Kagawa Campus
- Tokushima Bunri University
- Sanuki
- Japan
| | - Kazuaki Ohara
- Faculty of Pharmaceutical Sciences at Kagawa Campus
- Tokushima Bunri University
- Sanuki
- Japan
| | - Rika Taki
- Faculty of Pharmaceutical Sciences at Kagawa Campus
- Tokushima Bunri University
- Sanuki
- Japan
| | - Tomomi Saeki
- Faculty of Pharmaceutical Sciences at Kagawa Campus
- Tokushima Bunri University
- Sanuki
- Japan
| | - Kentaro Yamaguchi
- Faculty of Pharmaceutical Sciences at Kagawa Campus
- Tokushima Bunri University
- Sanuki
- Japan
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Alumina nanocomposites: a comparative approach highlighting the improved characteristics of nanocomposites for phosphopeptides enrichment. Amino Acids 2016; 48:2571-2579. [DOI: 10.1007/s00726-016-2281-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2016] [Accepted: 06/16/2016] [Indexed: 02/02/2023]
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8
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Li XS, Yuan BF, Feng YQ. Recent advances in phosphopeptide enrichment: Strategies and techniques. Trends Analyt Chem 2016. [DOI: 10.1016/j.trac.2015.11.001] [Citation(s) in RCA: 76] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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9
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Tsao CW, Yang ZJ. High Sensitivity and High Detection Specificity of Gold-Nanoparticle-Grafted Nanostructured Silicon Mass Spectrometry for Glucose Analysis. ACS APPLIED MATERIALS & INTERFACES 2015; 7:22630-22637. [PMID: 26393877 DOI: 10.1021/acsami.5b07395] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Desorption/ionization on silicon (DIOS) is a high-performance matrix-free mass spectrometry (MS) analysis method that involves using silicon nanostructures as a matrix for MS desorption/ionization. In this study, gold nanoparticles grafted onto a nanostructured silicon (AuNPs-nSi) surface were demonstrated as a DIOS-MS analysis approach with high sensitivity and high detection specificity for glucose detection. A glucose sample deposited on the AuNPs-nSi surface was directly catalyzed to negatively charged gluconic acid molecules on a single AuNPs-nSi chip for MS analysis. The AuNPs-nSi surface was fabricated using two electroless deposition steps and one electroless etching step. The effects of the electroless fabrication parameters on the glucose detection efficiency were evaluated. Practical application of AuNPs-nSi MS glucose analysis in urine samples was also demonstrated in this study.
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Affiliation(s)
- Chia-Wen Tsao
- Department of Mechanical Engineering, National Central University , Taoyuan City 32001, Taiwan
| | - Zhi-Jie Yang
- Department of Mechanical Engineering, National Central University , Taoyuan City 32001, Taiwan
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Sensing and Biosensing Applications of Nanoporous Anodic Alumina. ELECTROCHEMICALLY ENGINEERED NANOPOROUS MATERIALS 2015. [DOI: 10.1007/978-3-319-20346-1_7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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11
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12
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Recent developments in nanoparticle-based MALDI mass spectrometric analysis of phosphoproteomes. Mikrochim Acta 2014. [DOI: 10.1007/s00604-014-1191-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Zhu L, Zhang J, Guo Y. Enhanced detection and desalting free protocol for phosphopeptides eluted from immobilized Fe (III) affinity chromatography in direct MALDI TOF analysis. J Proteomics 2014; 96:360-5. [DOI: 10.1016/j.jprot.2013.12.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Revised: 11/14/2013] [Accepted: 12/02/2013] [Indexed: 12/24/2022]
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14
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Zhang Z, Wang Q, Li G. Fabrication of novel nanoporous array anodic alumina solid-phase microextraction fiber coating and its potential application for headspace sampling of biological volatile organic compounds. Anal Chim Acta 2012; 727:13-9. [DOI: 10.1016/j.aca.2012.03.033] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2012] [Revised: 03/15/2012] [Accepted: 03/17/2012] [Indexed: 10/28/2022]
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Trost M, Bridon G, Desjardins M, Thibault P. Subcellular phosphoproteomics. MASS SPECTROMETRY REVIEWS 2010; 29:962-90. [PMID: 20931658 DOI: 10.1002/mas.20297] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Protein phosphorylation represents one of the most extensively studied post-translational modifications, primarily due to the emergence of sensitive methods enabling the detection of this modification both in vitro and in vivo. The availability of enrichment methods combined with sensitive mass spectrometry instrumentation has played a crucial role in uncovering the dynamic changes and the large expanding repertoire of this reversible modification. The structural changes imparted by the phosphorylation of specific residues afford exquisite mechanisms for the regulation of protein functions by modulating new binding sites on scaffold proteins or by abrogating protein-protein interactions. However, the dynamic interplay of protein phosphorylation is not occurring randomly within the cell but is rather finely orchestrated by specific kinases and phosphatases that are unevenly distributed across subcellular compartments. This spatial separation not only regulates protein phosphorylation but can also control the activity of other enzymes and the transfer of other post-translational modifications. While numerous large-scale phosphoproteomics studies highlighted the extent and diversity of phosphoproteins present in total cell lysates, the further understanding of their regulation and biological activities require a spatio-temporal resolution only achievable through subcellular fractionation. This review presents a first account of the emerging field of subcellular phosphoproteomics where cell fractionation approaches are combined with sensitive mass spectrometry methods to facilitate the identification of low abundance proteins and to unravel the intricate regulation of protein phosphorylation.
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Affiliation(s)
- Matthias Trost
- Institute for Research in Immunology and Cancer, Université de Montréal, P.O. Box 6128, Station Centre-ville, Montréal, Québec, Canada H3C 3J7
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16
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The use of liquid phase deposition prepared phosphonate grafted silica nanoparticle-deposited capillaries in the enrichment of phosphopeptides. J Sep Sci 2010; 33:1806-15. [DOI: 10.1002/jssc.201000029] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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17
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García-Nebot MJ, Alegría A, Barberá R, Contreras MDM, Recio I. Milk versus caseinophosphopeptides added to fruit beverage: resistance and release from simulated gastrointestinal digestion. Peptides 2010; 31:555-61. [PMID: 20035813 DOI: 10.1016/j.peptides.2009.12.021] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/22/2009] [Revised: 12/15/2009] [Accepted: 12/15/2009] [Indexed: 10/20/2022]
Abstract
The influence of simulated gastrointestinal digestion on caseinophosphopeptides (CPPs) formation in milk-based fruit beverage was evaluated, together with resistance of a pool of CPPs added to fruit beverage. In milk-based fruit beverage, four CPPs were identified that can be justified by their presence in raw milk or due to processing. When it was subjected to simulated gastrointestinal digestion, 10 CPPs were identified, and only 1 presented the cluster (SpSpSpEE) (3 phosphoseryl group followed by 2 glutamic acid residues), which corresponded to alpha(s2)-CN(1-19)4P. CPPs added to fruit beverage are resistant to simulated gastrointestinal digestion, and 16 CPPs were identified originating from the fragmentation of added CPPs, and with a greater presence of the cluster compared with CPPs originating from milk-based fruit beverage. This could justify the use of CPPs as functional ingredients, and offer a good alternative to milk-based fruit beverage for improving mineral bioavailability.
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Affiliation(s)
- María José García-Nebot
- Nutrition and Food Chemistry, Faculty of Pharmacy, University of Valencia, Avda Vicente Andrés Estellés, 46100 Burjassot, Valencia, Spain
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Dunn JD, Reid GE, Bruening ML. Techniques for phosphopeptide enrichment prior to analysis by mass spectrometry. MASS SPECTROMETRY REVIEWS 2010; 29:29-54. [PMID: 19263479 DOI: 10.1002/mas.20219] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Mass spectrometry is the tool of choice to investigate protein phosphorylation, which plays a vital role in cell regulation and diseases such as cancer. However, low abundances of phosphopeptides and low degrees of phosphorylation typically necessitate isolation and concentration of phosphopeptides prior to MS analysis. This review discusses the enrichment of phosphopeptides with immobilized metal affinity chromatography, reversible covalent binding, and metal oxide affinity chromatography. Capture of phosphopeptides on TiO(2) seems especially promising in terms of selectivity and recovery, but the success of all methods depends on careful selection of binding, washing, and elution solutions. Enrichment techniques are complementary, such that a combination of methods greatly enhances the number of phosphopeptides isolated from complex samples. Development of a standard series of phosphopeptides in a highly complex mixture of digested proteins would greatly aid the comparison of different enrichment methods. Phosphopeptide binding to magnetic beads and on-plate isolation prior to MALDI-MS are emerging as convenient methods for purification of small (microL) samples. On-plate enrichment can yield >70% recoveries of phosphopeptides in mixtures of a few digested proteins and can avoid sample-handling steps, but this technique is likely limited to relatively simple samples such as immunoprecipitates. With recent advances in enrichment techniques in hand, MS analysis should provide important insights into phosphorylation pathways.
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Affiliation(s)
- Jamie D Dunn
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
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Wang D, Douma M, Swift B, Oleschuk RD, Horton JH. The adsorption of globular proteins onto a fluorinated PDMS surface. J Colloid Interface Sci 2009; 331:90-7. [DOI: 10.1016/j.jcis.2008.11.010] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2008] [Revised: 11/04/2008] [Accepted: 11/05/2008] [Indexed: 11/25/2022]
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20
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KONG XL. Nanodiamonds Used as a Platform for Studying Noncovalent Interaction by MALDI-MS. CHINESE J CHEM 2008. [DOI: 10.1002/cjoc.200890326] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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21
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ZHANG Y, LU HJ, YANG PY. Enhanced Ionization of Phosphopeptide Using Ammonium Phosphate as Matrix Additive by MALDI-MS. CHINESE J CHEM 2008. [DOI: 10.1002/cjoc.200890336] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Li Y, Xu X, Qi D, Deng C, Yang P, Zhang X. Novel Fe3O4@TiO2 Core−Shell Microspheres for Selective Enrichment of Phosphopeptides in Phosphoproteome Analysis. J Proteome Res 2008; 7:2526-38. [DOI: 10.1021/pr700582z] [Citation(s) in RCA: 127] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yan Li
- Department of Chemistry and Institutes of Biomedical Sciences, Fudan University, Shanghai 200433, China
| | - Xiuqing Xu
- Department of Chemistry and Institutes of Biomedical Sciences, Fudan University, Shanghai 200433, China
| | - Dawei Qi
- Department of Chemistry and Institutes of Biomedical Sciences, Fudan University, Shanghai 200433, China
| | - Chunhui Deng
- Department of Chemistry and Institutes of Biomedical Sciences, Fudan University, Shanghai 200433, China
| | - Pengyuan Yang
- Department of Chemistry and Institutes of Biomedical Sciences, Fudan University, Shanghai 200433, China
| | - Xiangmin Zhang
- Department of Chemistry and Institutes of Biomedical Sciences, Fudan University, Shanghai 200433, China
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Jalili PR, Ball HL. Novel reversible biotinylated probe for the selective enrichment of phosphorylated peptides from complex mixtures. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2008; 19:741-750. [PMID: 18359247 DOI: 10.1016/j.jasms.2008.02.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2007] [Revised: 02/06/2008] [Accepted: 02/18/2008] [Indexed: 05/26/2023]
Abstract
To improve the detection of phosphorylated peptides/proteins, we developed a novel protocol that involves the chemical derivatization of phosphate groups with a chemically engineered biotinylated-tag (biotin-tag), possessing three functional domains; a biotin group for binding to avidin, a base-labile 4-carboxy fluorenyl methoxycarbonyl (4-carboxy Fmoc) group, and a nucleophilic sulfhydryl moiety on the side-chain of cysteine. Using this approach, the derivatized, enzymatically digested peptides were selectively separated from unrelated sequences and impurities on immobilized avidin. Unlike previously published phosphopeptide enrichment procedures, this approach upon treatment with mild base liberates a covalently bound Gly-Cys analog of the peptide(s) of interest, exhibiting improved RP-HPLC retention and MS ionization properties compared with the precursor phosphopeptide sequence. The results obtained for a model peptide Akt-1 and two protein digests, demonstrated that the method is highly specific and allows selective enrichment of phosphorylated peptides at low concentrations of fmol/microL.
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Affiliation(s)
- Pegah R Jalili
- Protein Chemistry Technology Center, University of Texas, Southwestern Medical Center, Dallas, Texas 75390-8816, USA
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Han G, Ye M, Zou H. Development of phosphopeptide enrichment techniques for phosphoproteome analysis. Analyst 2008; 133:1128-38. [DOI: 10.1039/b806775a] [Citation(s) in RCA: 107] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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