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Physicochemical Characterization of Phosphopeptide/Titanium Dioxide Interactions Employing the Quartz Crystal Microbalance Technique
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - BMC, Analytisk kemi.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - BMC, Analytisk kemi.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Fysikalisk kemi.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - BMC, Analytisk kemi.
2013 (Engelska)Ingår i: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 117, nr 7, s. 2019-2025Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The rapidly growing field of phosphoproteomics has led to a strong demand for procedures enabling fast and reliable isolation and enrichment of phosphorylated proteins and peptides. During the past decade, several novel phosphopeptide enrichment methods based on the affinity of phosphoryl groups for titanium dioxide (TiO2) have been developed and tested. The ultimate goal of obtaining comprehensive phosphoproteomes has, however, been found difficult to achieve and the obtained results often vary, dependent on the enrichment method and protocol used. In the present study, the physical chemistry of the phosphopeptide binding to TiO2 is investigated by means of measurements using a quartz crystal microbalance with dissipation monitoring (QCM-D). Special emphasis is put on the effect of the degree of phosphorylation of the phosphopeptide, the impact of the primary amino acid structure, and the role of electrostatic interactions. The results show that, in general, adsorption of phosphopeptides follows the Langmuir model and that the affinity for the TiO2 surface increases in a nonlinear fashion with increasing degree of phosphorylation. An exception was detected, however, where positive cooperativity between the peptides existed and the Langmuir model no longer applied. The source behind the cooperativity could be traced back to the primary amino acid structure and, more specifically, the presence of positively charged amino acids in positions that enable electrostatic interaction with phosphoryl groups on neighboring peptides. Regardless of the net peptide charge, the TiO2–phosphopeptide interaction was for all phosphopeptides investigated found to be mainly of electrostatic origin. This study highlights and explains some of the most common problems with the TiO2-based enrichment methods used today.

Ort, förlag, år, upplaga, sidor
American Chemical Society (ACS), 2013. Vol. 117, nr 7, s. 2019-2025
Nationell ämneskategori
Fysikalisk kemi
Forskningsämne
Kemi med inriktning mot fysikalisk kemi
Identifikatorer
URN: urn:nbn:se:uu:diva-195262DOI: 10.1021/jp310161mISI: 000315432200004OAI: oai:DiVA.org:uu-195262DiVA, id: diva2:607358
Tillgänglig från: 2013-02-22 Skapad: 2013-02-22 Senast uppdaterad: 2017-12-06Bibliografiskt granskad
Ingår i avhandling
1. Enrichment and Separation of Phosphorylated Peptides on Titanium Dioxide Surfaces: Applied and Fundamental Studies
Öppna denna publikation i ny flik eller fönster >>Enrichment and Separation of Phosphorylated Peptides on Titanium Dioxide Surfaces: Applied and Fundamental Studies
2013 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Protein phosphorylation is a very common posttranslational modification (PTM), which lately has been found to hold the keyrole in the development of many severe diseases, including cancer. Thereby, phosphoprotein analysis tools, generally based on specific enrichment of the phosphoryl group, have been a hot topic during the last decade.

In this thesis, two new TiO2-based on-target enrichment methods are developed and presented together with enlightening fundamental results.

Evaluation of the developed methods was performed by the analysis of: custom peptides, β-casein, drinking milk, and the viral protein pIIIa. The results show that: i) by optimizing the enrichment protocol (first method), new phosphorylated peptides can be found and ii) by the addition of a separation step after the enrichment (second method), more multi-phosphorylated peptides, which usually are hard to find, could be detected. The fundamental part, on the other hand, shows that the phosphopeptide adsorption is caused by electrostatic interactions, in general follows the Langmuir model, and the affinity increases with the phosphorylation degree. Here, however, the complexity of the system was also discovered, as the adsorption mechanism was found to be affected by the amino acid sequence of the phosphopeptide.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis, 2013. s. 52
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1059
Nyckelord
Posttranslational modification, Phosphorylation, Mass spectrometry, MALDI, Adsorption, QCM-D
Nationell ämneskategori
Fysikalisk kemi
Forskningsämne
Fysikalisk kemi
Identifikatorer
urn:nbn:se:uu:diva-204723 (URN)978-91-554-8717-1 (ISBN)
Disputation
2013-09-27, The Svedbergssalen, BMC, Husargatan 3, Uppsala, 10:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2013-09-06 Skapad: 2013-08-09 Senast uppdaterad: 2014-01-07

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Förlagets fulltexthttp://pubs.acs.org/doi/abs/10.1021/jp310161m

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