Abstract
High-resolution Fourier transform ion cyclotron resonance (FTICR) mass spectrometry was developed and applied to the proteome analysis of bronchoalveolar lavage fluid (BALF) from a patient with pulmonary alveolar proteinosis. With use of 1-D and 2-D gel electrophoresis, surfactant protein A (SP-A) and other surfactant-related lung alveolar proteins were efficiently separated and identified by matrix-assisted laser desorption/ionization FTICR mass spectrometry . Low molecular mass BALF proteins were separated using a gradient 2-D gel. An efficient extraction/precipitation system was developed and used for the enrichment of surfactant proteins. The result of the BALF proteome analysis show the presence of several isoforms of SP-A, in which an N-non-glycosylierte form and several proline hydroxylations were identified. Furthermore, a number of protein spots were found to contain a mixture of proteins unresolved by 2-D gel electrophoresis, illustrating the feasibility of high-resolution mass spectrometry to provide identifications of proteins that remain unseparated in 2-D gels even upon extended pH gradients.
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Abbreviations
- FTICR-MS:
-
Fourier transform ion cyclotron resonance mass spectrometry
- BALF:
-
bronchoalveolar lavage fluid
- PAP:
-
pulmonary alveolar proteinosis
- GM-CSF:
-
granulocyte-macrophage colony stimulating factor
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Acknowledgements
Y.B. acknowledges a scholarship from the Max Planck Society. We gratefully acknowledge the expert assistance of Nikolay Youhnovski with FTICR-MS procedures. This work was supported by grants from the Deutsche Forschungsgemeinschaft (Alveolar Proteomics, to M.G. and M.P; and Biopolymer-MS, to M.P.) and the Fonds der Chemischen Industrie.
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Yu Bai and Dmitry Galetskiy both contributed equally to this work.
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Bai, Y., Galetskiy, D., Damoc, E. et al. Lung alveolar proteomics of bronchoalveolar lavage from a pulmonary alveolar proteinosis patient using high-resolution FTICR mass spectrometry. Anal Bioanal Chem 389, 1075–1085 (2007). https://doi.org/10.1007/s00216-007-1403-z
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DOI: https://doi.org/10.1007/s00216-007-1403-z