Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

You searched for id:"oai:edoc.ub.uni-muenchen.de:21630". One record found.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters

1. Radeck, Jara. Anatomy of the bacillus subtilis cell envelope stress response.

Degree: PhD, Biologie, 2017, Ludwig-Maximilians-Universität

The bacterial cell wall withstands the turgor pressure and is an essential structure for most bacteria. The lipid II cycle is responsible for transporting cell wall building blocks across the cytoplasmic membrane by means of the carrier molecule undecaprenyl phosphate (UP). One essential step is the recycling of undecaprenyl pyrophosphate (UPP) to UP by UPP phosphatases. This step is targeted by bacitracin, an UPP-binding anti-microbial peptide (AMP). In the course of this thesis, the effect of deletion and depletion of bacitracin resistance modules and UPP phosphatase genes on the cell envelope stress response in Bacillus subtilis was evaluated. The main resistance determinant against bacitracin, the ABC-transporter BceAB was found to be homeostatically regulated “to need” by flux-sensing of its own activity. The full effect of the secondary layer of resistance determinants, consisting of the UPP phosphatase BcrC and the phage shock protein-like response of the Lia-system, is only revealed in the absence of BceAB. For the first time, a resistance phenotype for LiaIH toward bacitracin was reported. The genes uppP and bcrC encode UPP phosphatases and were found to be synthetic lethal. Depletion of either UPP phosphatase in a double mutant background lead to bulging cells in exponential growth phase. BcrC is the main UPP phosphatase during growth. In contrast, UppP is primarily responsible for normal sporulation. The generation of UP in the lipid II cycle is essential and can be impaired by (i) addition of the UPP-binding AMP bacitracin, (ii) deletion and depletion of UPP phosphatases (BcrC and UppP), or, to a limited degree, (iii) deletion of the undecaprenol kinase (UDPK) DgkA. There is a marked difference in the CESR toward these challenges: while the addition of bacitracin activates two damage driven promoters, PliaI and PbcrC, a lack of UPP phosphatases or DgkA is only detected by the latter. This indicates that the blocking of UPP with bacitracin has a different effect on the cell envelope than the shortage of UPP phosphatases. Our analysis of the dephosphorylation of UPP in B. subtilis lays another cornerstone for the holistic understanding of the lipid II cycle.

Die bakterielle Zellwand ist für die meisten Bakterien überlebensnotwendig, zum Beispiel um dem Turgor entgegenzuwirken. Sie besteht aus Zucker-Peptidbausteinen, deren Auf- und Abbau komplex reguliert ist. Für die Anlieferung der Bausteine ist der Lipid II-Zyklus mit dem Transportmolekül Undecaprenylphosphat (UP) zuständig. Nach Einbau des Zellwandbausteins liegt das Transportmolekül als Undecaprenylpyrophosphat (UPP) vor und wird von UPP-Phosphatasen zu UP dephosphoryliert, um wiederverwendet werden zu können. An diesem essentiellen Schritt greift das Peptidantibiotikum Bacitracin an, indem es an UPP bindet und so das Recycling verhindert. Eine Blockade des Lipid II-Zyklus führt zu fehlerhafter Zellwandsynthese mit entsprechenden morphologischen Phänotypen, sowie zur Aktivierung der Zellwandstressantwort. In dieser Arbeit wird die…

Advisors/Committee Members: Mascher, Thorsten (advisor).

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Radeck, J. (2017). Anatomy of the bacillus subtilis cell envelope stress response. (Doctoral Dissertation). Ludwig-Maximilians-Universität. Retrieved from https://edoc.ub.uni-muenchen.de/21630/

Chicago Manual of Style (16th Edition):

Radeck, Jara. “Anatomy of the bacillus subtilis cell envelope stress response.” 2017. Doctoral Dissertation, Ludwig-Maximilians-Universität. Accessed September 25, 2018. https://edoc.ub.uni-muenchen.de/21630/.

MLA Handbook (7th Edition):

Radeck, Jara. “Anatomy of the bacillus subtilis cell envelope stress response.” 2017. Web. 25 Sep 2018.

Vancouver:

Radeck J. Anatomy of the bacillus subtilis cell envelope stress response. [Internet] [Doctoral dissertation]. Ludwig-Maximilians-Universität; 2017. [cited 2018 Sep 25]. Available from: https://edoc.ub.uni-muenchen.de/21630/.

Council of Science Editors:

Radeck J. Anatomy of the bacillus subtilis cell envelope stress response. [Doctoral Dissertation]. Ludwig-Maximilians-Universität; 2017. Available from: https://edoc.ub.uni-muenchen.de/21630/

.