A mycobacterium ESX-1-secreted virulence factor with unique requirements for export.

A mycobacterium ESX-1-secreted virulence factor with unique requirements for export. Research Abstract Details 

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A mycobacterium ESX-1-secreted virulence factor with unique requirements for export. Abstract Text:

Bryant McLaughlin,Janet S Chon,Jason A MacGurn,Fredric Carlsson,Terri L Cheng,Jeffery S Cox,Eric J Brown,

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.

A mycobacterium ESX-1-secreted virulence factor with unique requirements for export. Publishing Authors By Initials

B McLaughlin,JS Chon,JA MacGurn,F Carlsson,TL Cheng,JS Cox,EJ Brown,

For similar biological factors: toxins, biological: virulence factors research abstracts see: biological factors: toxins, biological: virulence factors research

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A mycobacterium ESX-1-secreted virulence factor with unique requirements for export. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: PLoS pathogens

VOLUME: 3

Page Numbers: e105

Journal Abbreviation: PLoS Pathog.

ISSN: 1553-7374

DAY: 3

MONTH: Aug

YEAR: 2007

A mycobacterium ESX-1-secreted virulence factor with unique requirements for export. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 101238921

A mycobacterium ESX-1-secreted virulence factor with unique requirements for export. Keywords Mesh Terms:

KEYWORDS: Virulence Factors

MESH TERMS: genetics

Chemical & Substance for Abstract: A mycobacterium ESX-1-secreted virulence factor with unique requirements for export. Information

Substance Name: Virulence Factors

Registry Number: 0

Grant and Affiliation Information for A mycobacterium ESX-1-secreted virulence factor with unique requirements for export.

AFFILIATION: Program in Microbial Pathogenesis and Host Defense, University of California San Francisco, San Francisco, California, United States of America.

Country: United States

AGENCY: United States NIGMS

GRANT: T32GM07810

ACRONYM: GM

MEDLINETA: PLoS Pathog

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DATABASENAME:

ACCESSION NUMBER: YP_178023

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