A mycobacterium ESX-1-secreted virulence factor with unique requirements for export.
Open accessAbstract
Specialized secretion systems of pathogenic bacteria commonly transport multiple effectors that act in concert to control and exploit the host cell as a replication-permissive niche. Both the Mycobacterium marinum and the Mycobacterium tuberculosis genomes contain an extended region of difference 1 (extRD1) locus that encodes one such pathway, the early secretory antigenic target 6 (ESAT-6) system 1 (ESX-1) secretion apparatus. ESX-1 is required for virulence and for secretion of the proteins ESAT-6, culture filtrate protein 10 (CFP-10), and EspA. Here, we show that both Rv3881c and its M. marinum homolog, Mh3881c, are secreted proteins, and disruption of RD1 in either organism blocks secretion. We have renamed the Rv3881c/Mh3881c gene espB for ESX-1 substrate protein B. Secretion of M. marinum EspB (EspBM) requires both the Mh3879c and Mh3871 genes within RD1, while CFP-10 secretion is not affected by disruption of Mh3879c. In contrast, disruption of Mh3866 or Mh3867 within the extRD1 locus prevents CFP-10 secretion without effect on EspBM. Mutants that fail to secrete only EspBM or only CFP-10 are less attenuated in macrophages than mutants failing to secrete both substrates. EspBM physically interacts with Mh3879c; the M. tuberculosis homolog, EspBT, physically interacts with Rv3879c; and mutants of EspBM that fail to bind Mh3879c fail to be secreted. We also found interaction between Rv3879c and Rv3871, a component of the ESX-1 machine, suggesting a mechanism for the secretion of EspB. The results establish EspB as a substrate of ESX-1 that is required for virulence and growth in macrophages and suggests that the contribution of ESX-1 to virulence may arise from the secretion of multiple independent substrates.
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Four ESX-1 substrates have been identified in addition to ESAT-6 and CFP-10: EspA, EspB, EspR, and the M. marinum homologue of Rv3864.
“Thus far, four ESX-1 substrates have been identified in addition to ESAT-6 and CFP-10. These substrates are called EspA [39], EspB [46], EspR [41], and the M. marinum homologue of Rv3864 [22].”
From Systematic Genetic Nomenclature for Type VII Secretion Systems (2009) · cites this paper as [46]
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Self-citation
- Authors
- McLaughlin, B., Chon, J. S., MacGurn, J. A., Carlsson, F., Cheng, T. L., Cox, J. S., & Brown, E. J.
- Affiliations
- University of California, San Francisco (US)
- Corresponding author
- Brown, Eric J
- Venue
- PLoS Pathogens
- Publisher
- Public Library of Science (PLoS)
- Published
- 2007-08-03
- Volume
- 3
- Issue
- 8
- Pages
- e105
- ISSN
- 1553-7366 (ISSN-L)
- 1553-7374
- PMC
- PMC1937011
- OpenAlex
- W2039288267
- Cited by
- 196
- References
- 29
- Citations by year
- 2026: 7 · 2025: 6 · 2024: 7 · 2023: 7 · 2022: 6 · 2021: 13 · 2020: 11 · 2019: 11 · 2018: 9 · 2017: 6 · 2016: 12 · 2015: 7 · 2014: 15 · 2013: 14 · 2012: 21
- FWCI
- 7.34
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- PLoS Pathogens (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- eScholarship (California Digital Library) (submittedVersion)
- eScholarship (California Digital Library) (submittedVersion, cc-by)
- Figshare (submittedVersion, cc-by)
- Funders
- Colorado State University
- Arizona State University
- University of Toronto
- National Institutes of Health (HHSN266200400091C)
- U.S. Public Health Service (HHSN26620040 0091C)
- University of California, San Francisco
- National Institute of General Medical Sciences (T32GM07810, T32GM007810)
- National Institute of Allergy and Infectious Diseases (R01AI055614, HHSN 266200400091C, T32AI060537)
- Topics
- Health Sciences › Medicine › Infectious Diseases › Tuberculosis Research and Epidemiology
- Health Sciences › Medicine › Epidemiology › Mycobacterium research and diagnosis
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
- Keywords
- EspB, Mycobacterium marinum, Mycobacterium tuberculosis, CFP-10, ESAT-6, EspA, protein secretion, virulence, macrophage survival, protein-protein interaction, attenuated mutants
- MeSH terms
- Antigens, Bacterial, Bacterial Proteins, Mutation, Mycobacterium tuberculosis, Mycobacterium marinum, Virulence Factors
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