Engineering novel bacterial biosensors for the characterization of membrane active natural products
Treatment of bacterial infections has become more challenging due to the expansion of antibiotic resistance. Especially, resistant Gram-negative pathogens are burdening healthcare systems worldwide. This increases the need for new antibiotics able to penetrate the outer-membrane (OM) of Gram-negativ...
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UiT The Arctic University of Norway
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ftunivtroemsoe:oai:munin.uit.no:10037/33610 2024-06-23T07:50:52+00:00 Engineering novel bacterial biosensors for the characterization of membrane active natural products Richard, Celine Sarah Marine 2024-06-10 https://hdl.handle.net/10037/33610 eng eng UiT The Arctic University of Norway UiT Norges arktiske universitet Paper I: Hansen, K.Ø., Hansen, I.K.Ø., Richard, C.S.M., Jenssen, M., Andersen, J.H. & Hansen, E.H. (2021). Antimicrobial Activity of Securamines from the Bryozoan Securiflustra securifrons . Natural Product Communications, 16 (2). Also available in Munin at https://hdl.handle.net/10037/21871 . Paper II: Richard, C.S.M., Dey, H., Øyen, F., Maqsood, M. & Blencke, H.M. (2023). Outer Membrane Integrity-Dependent Fluorescence of the Japanese Eel UnaG Protein in Live Escherichia coli Cells . Biosensors, 13 (2), 232. Also available in Munin at https://hdl.handle.net/10037/30492 . Paper III: Richard, C.S.M., Dey, H., Murvold, E., Øyen, F., Li, C. & Blencke, H.M. Cloning of a dual biosensor relying on UnaG and luciferase for detection of outer and plasma membrane disruption and its application to characterizing the membranolytic effects of green sea urchin Strongylocentrotus droebachiensis Centroci-1-based antimicrobial peptides. (Manuscript) 978-82-8266-261-1 https://hdl.handle.net/10037/33610 openAccess Copyright 2024 The Author(s) Antibiotic resistance bacterial biosensor antimicrobial peptide natural product drug discovery reporter gene membrane DOKTOR-002 Doctoral thesis Doktorgradsavhandling 2024 ftunivtroemsoe 2024-05-29T00:47:55Z Treatment of bacterial infections has become more challenging due to the expansion of antibiotic resistance. Especially, resistant Gram-negative pathogens are burdening healthcare systems worldwide. This increases the need for new antibiotics able to penetrate the outer-membrane (OM) of Gram-negatives. Natural products (NPs) from the marine environment e.g. antimicrobial peptides (AMPs) are interesting drug lead candidates as they often show potent activity against bacterial membranes and are still under-studied compared to NPs from the terrestrial environment. Mode of action (MoA) specific drug lead discovery requires new tools, which can be based on engineered bacterial cells as biosensors. To identify MoA of peptides in general, and the impact of AMPs on bacterial membranes specifically, bacterial whole-cell biosensors (BWCBs) based on different reporter gene constructs are one possible solution to facilitate effective discovery pipelines. The work conducted in this thesis aims to engineer novel BWCBs with relatively new reporter genes to facilitate a better understanding of the impact of marine AMPs on the bacterial membranes already during screening steps of drug discovery. In paper I, as part of the ongoing research for antimicrobial NPs, the BWCBs Escherichia coli (for Gram-negative) and Bacillus subtilis (for Gram-positive) carrying the bacterial luciferase lux operon or the eukaryotic click beetle luciferase lucGR were used to study the impact of compounds extracted from the arctic bryozoan Securiflustra securifrons , on the cell viability or membrane integrity, respectively. One of them, the Securamine H, was found to inhibit the viability of Gram-positive bacteria and reduce metabolic activity of B. subtilis but the MoA on this intracellular target still needs to be identified. In paper II, a recently discovered reporter gene, unaG , from the Japanese eel Anguilla japonicas , was used to engineer a novel MoA specific BWCB to investigate OM integrity of Gram-negative bacteria. We used the E. coli ... Doctoral or Postdoctoral Thesis Arctic University of Tromsø: Munin Open Research Archive Arctic Moa ENVELOPE(15.184,15.184,67.286,67.286) |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
Antibiotic resistance bacterial biosensor antimicrobial peptide natural product drug discovery reporter gene membrane DOKTOR-002 |
spellingShingle |
Antibiotic resistance bacterial biosensor antimicrobial peptide natural product drug discovery reporter gene membrane DOKTOR-002 Richard, Celine Sarah Marine Engineering novel bacterial biosensors for the characterization of membrane active natural products |
topic_facet |
Antibiotic resistance bacterial biosensor antimicrobial peptide natural product drug discovery reporter gene membrane DOKTOR-002 |
description |
Treatment of bacterial infections has become more challenging due to the expansion of antibiotic resistance. Especially, resistant Gram-negative pathogens are burdening healthcare systems worldwide. This increases the need for new antibiotics able to penetrate the outer-membrane (OM) of Gram-negatives. Natural products (NPs) from the marine environment e.g. antimicrobial peptides (AMPs) are interesting drug lead candidates as they often show potent activity against bacterial membranes and are still under-studied compared to NPs from the terrestrial environment. Mode of action (MoA) specific drug lead discovery requires new tools, which can be based on engineered bacterial cells as biosensors. To identify MoA of peptides in general, and the impact of AMPs on bacterial membranes specifically, bacterial whole-cell biosensors (BWCBs) based on different reporter gene constructs are one possible solution to facilitate effective discovery pipelines. The work conducted in this thesis aims to engineer novel BWCBs with relatively new reporter genes to facilitate a better understanding of the impact of marine AMPs on the bacterial membranes already during screening steps of drug discovery. In paper I, as part of the ongoing research for antimicrobial NPs, the BWCBs Escherichia coli (for Gram-negative) and Bacillus subtilis (for Gram-positive) carrying the bacterial luciferase lux operon or the eukaryotic click beetle luciferase lucGR were used to study the impact of compounds extracted from the arctic bryozoan Securiflustra securifrons , on the cell viability or membrane integrity, respectively. One of them, the Securamine H, was found to inhibit the viability of Gram-positive bacteria and reduce metabolic activity of B. subtilis but the MoA on this intracellular target still needs to be identified. In paper II, a recently discovered reporter gene, unaG , from the Japanese eel Anguilla japonicas , was used to engineer a novel MoA specific BWCB to investigate OM integrity of Gram-negative bacteria. We used the E. coli ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Richard, Celine Sarah Marine |
author_facet |
Richard, Celine Sarah Marine |
author_sort |
Richard, Celine Sarah Marine |
title |
Engineering novel bacterial biosensors for the characterization of membrane active natural products |
title_short |
Engineering novel bacterial biosensors for the characterization of membrane active natural products |
title_full |
Engineering novel bacterial biosensors for the characterization of membrane active natural products |
title_fullStr |
Engineering novel bacterial biosensors for the characterization of membrane active natural products |
title_full_unstemmed |
Engineering novel bacterial biosensors for the characterization of membrane active natural products |
title_sort |
engineering novel bacterial biosensors for the characterization of membrane active natural products |
publisher |
UiT The Arctic University of Norway |
publishDate |
2024 |
url |
https://hdl.handle.net/10037/33610 |
long_lat |
ENVELOPE(15.184,15.184,67.286,67.286) |
geographic |
Arctic Moa |
geographic_facet |
Arctic Moa |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
Paper I: Hansen, K.Ø., Hansen, I.K.Ø., Richard, C.S.M., Jenssen, M., Andersen, J.H. & Hansen, E.H. (2021). Antimicrobial Activity of Securamines from the Bryozoan Securiflustra securifrons . Natural Product Communications, 16 (2). Also available in Munin at https://hdl.handle.net/10037/21871 . Paper II: Richard, C.S.M., Dey, H., Øyen, F., Maqsood, M. & Blencke, H.M. (2023). Outer Membrane Integrity-Dependent Fluorescence of the Japanese Eel UnaG Protein in Live Escherichia coli Cells . Biosensors, 13 (2), 232. Also available in Munin at https://hdl.handle.net/10037/30492 . Paper III: Richard, C.S.M., Dey, H., Murvold, E., Øyen, F., Li, C. & Blencke, H.M. Cloning of a dual biosensor relying on UnaG and luciferase for detection of outer and plasma membrane disruption and its application to characterizing the membranolytic effects of green sea urchin Strongylocentrotus droebachiensis Centroci-1-based antimicrobial peptides. (Manuscript) 978-82-8266-261-1 https://hdl.handle.net/10037/33610 |
op_rights |
openAccess Copyright 2024 The Author(s) |
_version_ |
1802641811261358080 |