Article (Scientific journals)
MALDI-In Source Decay Applied to Mass Spectrometry Imaging: A New Tool for Protein Identification.
Debois, Delphine; Bertrand, Virginie; Quinton, Loïc et al.
2010In Analytical Chemistry, 82 (10), p. 3969-4304
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Keywords :
Mass Spectrometry; MALDI imaging; Top-down proteomics
Abstract :
[en] Matrix-assisted laser desorption ionization-mass spectrometry (MALDI-MS) imaging is a powerful technique giving access to the distribution of a large range of biomolecules directly from a tissue section, allowing, for example, the discovery of new pathological biomarkers. Nevertheless, one main difficulty lies in the identification of the detected species, especially proteins. MALDI-in source decay (ISD) is used to fragment ions directly in the mass spectrometer ion source. This technique does not require any special sample treatment but only the use of a specific MALDI matrix such as 2,5-dihydroxybenzoic acid or 1,5-diaminonaphthalene. MALDI-ISD is generally employed on classical, purified samples, but here we demonstrate that ISD can also be performed directly on mixtures and on a tissue slice leading to fragment ions, allowing the identification of major proteins without any further treatment. On a porcine eye lens slice, de novo sequencing was even performed. Crystallins not yet referenced in databases were identified by sequence homology with other mammalian species. On a mouse brain slice, we demonstrate that results obtained with ISD are comparable and even better than those obtained with a classical in situ digestion.
Research center :
Giga-Systems Biology and Chemical Biology - ULiège
CART - Centre Interfacultaire d'Analyse des Résidus en Traces - ULiège
Disciplines :
Human health sciences: Multidisciplinary, general & others
Chemistry
Biochemistry, biophysics & molecular biology
Author, co-author :
Debois, Delphine ;  Université de Liège - ULiège > Département de chimie (sciences) > GIGA-R : Laboratoire de spectrométrie de masse (L.S.M.)
Bertrand, Virginie ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques > Histologie - Cytologie
Quinton, Loïc  ;  Université de Liège - ULiège > Département de chimie (sciences) > GIGA-R : Laboratoire de spectrométrie de masse (L.S.M.)
De Pauw-Gillet, Marie-Claire ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques > Histologie - Cytologie - Département des sciences biomédicales et précliniques
De Pauw, Edwin  ;  Université de Liège - ULiège > Département de chimie (sciences) > GIGA-R : Laboratoire de spectrométrie de masse (L.S.M.)
Language :
English
Title :
MALDI-In Source Decay Applied to Mass Spectrometry Imaging: A New Tool for Protein Identification.
Publication date :
15 May 2010
Journal title :
Analytical Chemistry
ISSN :
0003-2700
eISSN :
1520-6882
Publisher :
American Chemical Society, Washington, United States - District of Columbia
Volume :
82
Issue :
10
Pages :
3969-4304
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
FEDER - Fonds Européen de Développement Régional [BE]
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
DGTRE - Région wallonne. Direction générale des Technologies, de la Recherche et de l'Énergie [BE]
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