Paralytic shellfish poisoning toxin analysis by capillary electrophoresis-linear ion trap mass spectrometry

Par Conseil national de recherches du Canada

Auteur	Rechercher : Melanson, J. E.; Rechercher : Reeves, K.; Rechercher : Thomas, K. M.
Format	Texte, Autre
Sujet	paralytic shellfish poisoning; toxins; mass spectrometry
Résumé	Here we report the first application of a matrix-assisted laser desorption/ionization (MALDI) triple-quadrupole mass spectrometer for targeted proteomics. Employing an amine-specific isotopic labelling approach, the technique was validated using five randomly selected bovine serum albumin peptides differentially labelled at known ratios. An indirect benefit of the isotopic labelling technique is a significant enhancement of the a1 ion in tandem mass (MS/MS) spectra of all peptides studied. Therefore, the a1 ion was selected as the fragment ion for multiple reaction monitoring (MRM) in all cases, eliminating tedious method development and optimization. Accurate quantification was achieved with an average relative standard deviation (RSD) of 5% (n = 5) and a detection limit of 14 amol. The technique was then applied to validate an important virulence biomarker of the fungal pathogen Candida albicans, which was not accurately quantified using global proteomics experiment employing two-dimensional liquid chromatography/electrospray ionization tandem mass spectrometry (2D-LC/ESI)-MS/MS. Using LC/MALDI-MRM analysis of five tryptic peptides, the protein PHR1 was found to be upregulated in the hyphal (pathogenic) form of C. albicans by a factor of 7.7 Â± 0.8.
Langue	anglais
Numéro du CNRC	42650 1575
Numéro NPARC	3538083
Exporter la notice	Exporter en format RIS
Signaler une correction	Signaler une correction (s'ouvre dans un nouvel onglet)
Identificateur de l’enregistrement	1bde3273-35f6-4a57-a869-157345b0c06f
Enregistrement créé	2009-03-01
Enregistrement modifié	2020-03-03

Date de modification :: 2024-12-26