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Functional analysis of the EsaB component of the Staphylococcus aureus Type VII secretion system

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Date
01/12/2017
Author
Casabona, M Guillermina
Buchanan, Grant
Zoltner, Martin
Harkins, Catriona P
Holden, Matthew T G
Palmer, Tracy
Keywords
Protein secretion
T7SS
Regulation
Staphylococcus aureus
QH301 Biology
QR Microbiology
NDAS
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Abstract
Type VII secretion systems (T7SS) are found in many bacteria and secrete proteins involved in virulence and bacterial competition. In Staphylococcus aureus the small ubiquitin-like EsaB protein has been previously implicated as having a regulatory role in the production of the EsxC substrate. Here we show that in the S. aureus RN6390 strain, EsaB does not genetically regulate production of any T7 substrates or components, but is indispensable for secretion activity. Consistent with EsaB being an essential component of the T7SS, loss of either EsaB or EssC are associated with upregulation of a common set of iron acquisition genes. However, a further subset of genes were dysregulated only in the absence of EsaB. Quantitative western blotting indicates that EsaB is present at very low levels in cells. Substitution of a highly conserved threonine for alanine or arginine resulted in a loss of EsaB activity and destabilisation of the protein. Taken together our findings show that EsaB is essential for T7SS activity in RN6390.
Citation
Casabona , M G , Buchanan , G , Zoltner , M , Harkins , C P , Holden , M T G & Palmer , T 2017 , ' Functional analysis of the EsaB component of the Staphylococcus aureus Type VII secretion system ' , Microbiology , vol. 163 , no. 12 , pp. 1851-1863 . https://doi.org/10.1099/mic.0.000580
Publication
Microbiology
Status
Peer reviewed
DOI
https://doi.org/10.1099/mic.0.000580
ISSN
1350-0872
Type
Journal article
Rights
© 2017 The Authors. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, distribution and reproduction in any medium, provided the original author and source are credited.
Description
This study was supported by the Wellcome Trust (through Investigator Award 10183/Z/15/Z to TP and through Clinical PhD studentship support to CPH through grant 104241/z/14/z), the Biotechnology and Biological Sciences Research Council and the Medical Research Council (through grants BB/H007571/1 and MR/M011224/1, respectively).
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/12209

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