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The Sec Pathways and Exportomes of Mycobacterium tuberculosis
Brittany K Miller1, Katelyn E Zulauf1, Miriam Braunstein1
1Department of Microbiology and Immunology, University of North Carolina - Chapel Hill, Chapel Hill, NC 27599.
Microbiology Spectrum
|April 8, 2017
Summary
Bacteria use protein export pathways, like the Sec pathway, for essential functions and virulence. This review details the SecA1 and SecA2 pathways in mycobacteria, crucial for pathogenesis and dormancy in Mycobacterium tuberculosis.
Area of Science:
- Microbiology
- Molecular Biology
- Pathogenesis
Background:
- Bacteria employ conserved protein export pathways for essential cellular functions and virulence.
- The general Sec pathway, powered by SecA ATPase, handles the majority of protein export.
- Mycobacteria possess two SecA paralogs: SecA1 (essential) and SecA2 (nonessential, virulence-associated).
Purpose of the Study:
- To review the mechanisms of SecA1 and SecA2 protein export pathways in mycobacteria.
- To discuss key substrates exported by SecA1 and SecA2.
- To explore the roles of SecA1 and SecA2 in Mycobacterium tuberculosis pathogenesis and dormancy.
Main Methods:
- Literature review of existing research on bacterial protein export.
- Analysis of SecA1 and SecA2 pathway mechanisms.
- Discussion of known and potential protein substrates.
Main Results:
- SecA1 is essential for bulk protein export via the canonical Sec pathway.
- SecA2, while nonessential, is critical for the virulence of pathogens like Mycobacterium tuberculosis.
- Specific substrates exported by SecA1 and SecA2 have implications for M. tuberculosis pathogenesis and dormancy.
Conclusions:
- The SecA1 and SecA2 pathways represent distinct yet vital routes for protein export in mycobacteria.
- Understanding these pathways offers insights into bacterial virulence and potential therapeutic targets.
- Further research into SecA1/SecA2 substrates may elucidate mechanisms of M. tuberculosis dormancy.