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Metallophores as Tools for Antibiotic Drug Development and the Study of Bacterial Metal Homeostasis.
Metallophores as Tools for Antibiotic Drug Development and the Study of Bacterial Metal Homeostasis.
상세정보
- 자료유형
- 학위논문(국외)
- 기본표목-개인명
- 표제와 책임표시사항
- Metallophores as Tools for Antibiotic Drug Development and the Study of Bacterial Metal Homeostasis.
- 발행, 배포, 간사 사항
- 발행, 배포, 간사 사항
- 형태사항
- 243 p.
- 일반주기
- Source: Dissertations Abstracts International, Volume: 86-11, Section: B.
- 일반주기
- Advisor: Boros, Eszter.
- 학위논문주기
- Thesis (Ph.D.)--The University of Wisconsin - Madison, 2025.
- 요약 등 주기
- 요약Antibiotic resistance poses a critical global health threat, contributing to an estimated 4.95 million deaths in 2019 alone. The efficacy of conventional antibiotics is increasingly compromised by the emergence of resistant strains, limiting treatment options. To circumvent these resistance mechanisms, alternative strategies are being explored, including the use of siderophores, microbe secondary metabolite, to hijack bacterial iron import pathways for cytotoxic payload delivery inspired by natural antibiotics. This approach has gained significant traction, exemplified by the FDA approval of Cefiderocol, a siderophore antibiotic, and extensive efforts to develop other siderophore-based antibiotics. However, our knowledge of the uptake and stability of these compounds remains incomplete.To advance our understanding of siderophore uptake and stability, we developed and applied radiolabeled and photoaffinity-labeled small molecule tools. First, we developed a dual radiolabeling strategy using 67Ga and 124I to track both in vitro and in vivo behavior. This revealed that Ga siderophore conjugates are internalized as metal complexes via siderophore-mediated uptake. In vivo studies, utilizing a murine infection model, demonstrated probe degradation primarily through metal cargo decomplexation, though Ga-D6-I exhibited significant uptake in infected tissue (Chapter 2). Second, based on the Fe-D1/FoxA co-crystal structure, we designed and optimized photoaffinity probes to understand their reactivity and validate their ability to target siderophore transmembrane transporters. These probes successfully labeled isolated FoxA protein (Chapter 3). Third, when applied to live bacterial cells, these probes facilitated the visualization and identification of siderophore-binding proteins, suggesting a potential role for OmpF in the uptake of these compounds (Chapter 4). Overall, this research provides valuable insights into the stability and uptake mechanisms of Ga-siderophore conjugates, offering new tools and strategies for future studies on siderophore-antibiotic acquisition and pharmacokinetics.
- 주제명부출표목-일반주제명
- 주제명부출표목-일반주제명
- 주제명부출표목-일반주제명
- 주제명부출표목-일반주제명
- 비통제 색인어
- 비통제 색인어
- 비통제 색인어
- 비통제 색인어
- 비통제 색인어
- 부출표목-단체명
- 기본자료저록
- Dissertations Abstracts International. 86-11B.
- 전자적 위치 및 접속
- 원문정보보기
MARC
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■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a540
■1001 ▼aCao, Minhua.
■24510▼aMetallophores as Tools for Antibiotic Drug Development and the Study of Bacterial Metal Homeostasis.
■260 ▼a[S.l.]▼bThe University of Wisconsin - Madison. ▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a243 p.
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-11, Section: B.
■500 ▼aAdvisor: Boros, Eszter.
■5021 ▼aThesis (Ph.D.)--The University of Wisconsin - Madison, 2025.
■520 ▼aAntibiotic resistance poses a critical global health threat, contributing to an estimated 4.95 million deaths in 2019 alone. The efficacy of conventional antibiotics is increasingly compromised by the emergence of resistant strains, limiting treatment options. To circumvent these resistance mechanisms, alternative strategies are being explored, including the use of siderophores, microbe secondary metabolite, to hijack bacterial iron import pathways for cytotoxic payload delivery inspired by natural antibiotics. This approach has gained significant traction, exemplified by the FDA approval of Cefiderocol, a siderophore antibiotic, and extensive efforts to develop other siderophore-based antibiotics. However, our knowledge of the uptake and stability of these compounds remains incomplete.To advance our understanding of siderophore uptake and stability, we developed and applied radiolabeled and photoaffinity-labeled small molecule tools. First, we developed a dual radiolabeling strategy using 67Ga and 124I to track both in vitro and in vivo behavior. This revealed that Ga siderophore conjugates are internalized as metal complexes via siderophore-mediated uptake. In vivo studies, utilizing a murine infection model, demonstrated probe degradation primarily through metal cargo decomplexation, though Ga-D6-I exhibited significant uptake in infected tissue (Chapter 2). Second, based on the Fe-D1/FoxA co-crystal structure, we designed and optimized photoaffinity probes to understand their reactivity and validate their ability to target siderophore transmembrane transporters. These probes successfully labeled isolated FoxA protein (Chapter 3). Third, when applied to live bacterial cells, these probes facilitated the visualization and identification of siderophore-binding proteins, suggesting a potential role for OmpF in the uptake of these compounds (Chapter 4). Overall, this research provides valuable insights into the stability and uptake mechanisms of Ga-siderophore conjugates, offering new tools and strategies for future studies on siderophore-antibiotic acquisition and pharmacokinetics.
■590 ▼aSchool code: 0262.
■650 4▼aChemistry.
■650 4▼aPharmacology.
■650 4▼aBiomedical engineering.
■650 4▼aPharmaceutical sciences.
■653 ▼aIron uptake
■653 ▼aSiderophores
■653 ▼aSiderophore antibiotic
■653 ▼aAntibiotic resistance
■653 ▼aPharmacokinetics
■690 ▼a0485
■690 ▼a0541
■690 ▼a0419
■690 ▼a0572
■71020▼aThe University of Wisconsin - Madison▼bChemistry.
■7730 ▼tDissertations Abstracts International▼g86-11B.
■790 ▼a0262
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17357769▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.



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