Abstract
The extraction and isolation of native bacterial proteins continue to be valuable technical pursuits in order to understand bacterial physiology, screen for virulence determinants, and describe antigens. In this chapter, methods for the manipulation of whole mycobacterial cells are described in detail. Specifically, the concentration of spent culture filtrate media is described in order to permit separation of soluble, secreted proteins; several discrete separation techniques, including precipitation of protein mixtures with ammonium sulfate and separation of proteins by hydrophobic chromatography are also provided. Similarly, the generation of whole cell lysate and facile separation of lysate into subcellular fractions to afford cell wall, cell membrane, and cytosol enriched proteins is described. Due to the hydrophobic nature of cell wall and cell membrane proteins, several extraction protocols to resolve protein subsets (such as extraction with urea and SDS) are also provided, as well as a separation technique (isoelectric focusing) that can be applied to separate hydrophobic proteins. Lastly, two commonly used analytical techniques, in-gel digestion of proteins for LC-MS and analysis of intact proteins by MALDI-ToF MS, are provided for rapid analysis of discrete proteins within subcellular or chromatographic fractions. While these methods were optimized for the manipulation of Mycobacterium tuberculosis cells, they have been successfully applied to extract and isolate Mycobacterium leprae, Mycobacterium ulcerans, and Mycobacterium avium proteins. In addition, a number of these methods may be applied to extract and analyze mycobacterial proteins from cell lines and host derived samples.
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Acknowledgements
This work was supported by NIH-NIAID Contracts HHSN266200400091c and ATCC contract 2010-0516-0005 (a subcontract of NIH-NIAID Contract HHSN272201000027c). The original work is credited to NIH-NIAID Contract AI-75320.
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Lucas, M.C. et al. (2015). Fractionation and Analysis of Mycobacterial Proteins. In: Parish, T., Roberts, D. (eds) Mycobacteria Protocols. Methods in Molecular Biology, vol 1285. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-2450-9_4
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DOI: https://doi.org/10.1007/978-1-4939-2450-9_4
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