Direct, simple derivatization of disulfide bonds in proteins with organic mercury in alkaline medium without any chemical pre-reducing agents.
In: Analytica chimica acta, Jg. 843 (2014-09-16), S. 1-6
academicJournal
Zugriff:
In this work we have studied the derivatization of protein disulfide bonds with p-Hydroxymercurybenzoate (pHMB) in strong alkaline medium without any preliminary reduction. The reaction has been followed by the determination of the protein-pHMB complex using size exclusion chromatography coupled to a microwave/UV mercury oxidation system for the on-line oxidation of free and protein-complexed pHMB and atomic fluorescence spectrometry (SEC-CVG-AFS) detection. The reaction has been optimized by an experimental design using lysozyme as a model protein and applied to several thiolic proteins. The proposed method reports, for the first time, that it is possible to label 75-100% cysteines of proteins and, thus, to determine thiolic proteins without the need of any reducing step to obtain reduced SH groups before mercury labelling. We obtained a detection limit of 100 nmol L(-1) based on a signal-to-noise ratio of 3 for unbound and complexed pHMB, corresponding to a detection limit of proteins ranged between 3 and 360 nmol L(-1), depending on the number of cysteines in the protein sequence.
(Copyright © 2014 Elsevier B.V. All rights reserved.)
Titel: |
Direct, simple derivatization of disulfide bonds in proteins with organic mercury in alkaline medium without any chemical pre-reducing agents.
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Autor/in / Beteiligte Person: | Campanella, B ; Onor, M ; Ferrari, C ; D'Ulivo, A ; Bramanti, E |
Zeitschrift: | Analytica chimica acta, Jg. 843 (2014-09-16), S. 1-6 |
Veröffentlichung: | Amsterdam : Elsevier ; <i>Original Publication</i>: Amsterdam., 2014 |
Medientyp: | academicJournal |
ISSN: | 1873-4324 (electronic) |
DOI: | 10.1016/j.aca.2014.07.003 |
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