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Comparative proteomic analysis of Mycobacterium tuberculosis lineage 7 and lineage 4 strains reveals differentially abundant proteins linked to slow growth and virulence

Yimer, Solomon Abebe; Birhanu, Alemayehu Godana; Kalayou, Shewit; Riaz, Tahira; Zegeye, Ephrem Debebe; Beyene, Getachew Tesfaye; Holm-Hansen, Carol J C; Norheim, Gunnstein; Abebe, Markose; Aseffa, Abraham; Tonjum, Tone
Peer reviewed, Journal article
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URI
http://hdl.handle.net/11250/2506862
Date
2017
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Original version
Frontiers in Microbiology. 2017, 8 .   10.3389/fmicb.2017.00795
Abstract
In order to decipher the nature of the slowly growing Mycobacterium tuberculosis (M.tuberculosis) lineage 7, the differentially abundant proteins in strains ofM. tuberculosis lineage 7 and lineage 4 were defined. Comparative proteomic analysis by mass spectrometry was employed to identify, quantitate and compare the protein profiles of strains from the two M. tuberculosis lineages. Label-free peptide quantification of Whole cells from M. tuberculosis lineage 7 and 4 yielded the identification of 2825 and 2541 proteins, respectively. A combined total of 2867 protein groups covering 71% of the predicted M. tuberculosis proteome were identified. The abundance of 125 proteins in M. tuberculosis lineage 7 and 4 strains was significantly altered. Notably, the analysis showed that a number of M. tuberculosis proteins involved in growth and virulence were less abundant in lineage 7 strains compared to lineage 4. Five ABC transporter proteins, three phosphate binding proteins essential for inorganic phosphate uptake, and six components of the type 7 secretion system ESX-3 involved in iron acquisition were less abundant in M. tuberculosis lineage 7. This proteogenomic analysis provided an insight into the lineage 7-specific protein profile which may provide clues to understanding the differential properties of lineage 7 strains in terms of slow growth, survival fitness, and pathogenesis.
Journal
Frontiers in Microbiology

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