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Anaerobic IAA Production and Its Metabolic Impact in Select Acetogenic Gut Bacteria
Anaerobic IAA Production and Its Metabolic Impact in Select Acetogenic Gut Bacteria
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104855
- ISBN
- 9798288814808
- DDC
- 612
- 저자명
- DeFeo, Mary E.
- 서명/저자
- Anaerobic IAA Production and Its Metabolic Impact in Select Acetogenic Gut Bacteria
- 발행사항
- [Sl] : Stanford University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 184 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-02, Section: B.
- 주기사항
- Advisor: Dodd, Dylan.
- 학위논문주기
- Thesis (Ph.D.)--Stanford University, 2025.
- 초록/해제
- 요약Indoleacetic acid (IAA), a gut bacterial tryptophan metabolite, is known for its ability to modulate host immunity by engaging the aryl-hydrocarbon receptor and is negatively associated with numerous diseases. Despite its significant therapeutic potential, anaerobic IAA production in the human gut is undefined. This dissertation outlines efforts to investigate the enzymatic pathway responsible for anaerobic IAA production and its metabolic impact on select gut bacteria. In chapter 2, we identify gut bacteria that robustly produce IAA under anaerobic conditions. Our screen revealed that these microbes also produce end products from the oxidative metabolism of other aromatic and branched-chain amino acids, which have been shown in other organisms to require the activity of 2-oxoacid:ferredoxin oxidoreductases (OFORs). Using heterologous overexpression in E. coli, we biochemically characterize an enzymatic pathway that is sufficient for anaerobic IAA production and includes an OFOR. Because the OFOR enzyme family can act on a wide range of substrates, in Chapter 3, we used enzyme assays to measure the specific activity of 13 previously uncharacterized OFOR enzymes in these IAA producers against a panel of substrates. We also investigate how enzyme structure, particularly in the active site, may contribute to this diverse substrate activity. In chapter 4, we explore how IAA production impacts cellular physiology in IAA producers, and using stable isotope tracing, we reveal a link between tryptophan oxidation into IAA and carbon fixation. Finally, in chapter 5, we outline attempts to develop genetic systems for targeted mutagenesis in these non-model gut bacteria. Collectively, this work contributes mechanistic insights into the production of IAA and other health-modifying microbial metabolites and furthers our understanding of key metabolic processes that underlie bacterial physiology in the gut.
- 일반주제명
- Physiology
- 일반주제명
- Pathogens
- 일반주제명
- Hydrocarbons
- 일반주제명
- Disease
- 일반주제명
- Bacteria
- 일반주제명
- Earth
- 일반주제명
- Urine
- 일반주제명
- Amino acids
- 일반주제명
- Diet
- 일반주제명
- Energy
- 일반주제명
- Metabolism
- 일반주제명
- Protein synthesis
- 일반주제명
- Cells
- 일반주제명
- Oxidation
- 일반주제명
- Liver
- 일반주제명
- Antibiotics
- 일반주제명
- Carbon
- 일반주제명
- Glucose
- 일반주제명
- Veins & arteries
- 일반주제명
- Metabolites
- 일반주제명
- Proteomics
- 일반주제명
- Microbiology
- 일반주제명
- Immunology
- 키워드
- Gut bacteria
- 기타저자
- Stanford University.
- 기본자료저록
- Dissertations Abstracts International. 87-02B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a612
■1001 ▼aDeFeo, Mary E.
■24510▼aAnaerobic IAA Production and Its Metabolic Impact in Select Acetogenic Gut Bacteria
■260 ▼a[Sl]▼bStanford University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a184 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-02, Section: B.
■500 ▼aAdvisor: Dodd, Dylan.
■5021 ▼aThesis (Ph.D.)--Stanford University, 2025.
■520 ▼aIndoleacetic acid (IAA), a gut bacterial tryptophan metabolite, is known for its ability to modulate host immunity by engaging the aryl-hydrocarbon receptor and is negatively associated with numerous diseases. Despite its significant therapeutic potential, anaerobic IAA production in the human gut is undefined. This dissertation outlines efforts to investigate the enzymatic pathway responsible for anaerobic IAA production and its metabolic impact on select gut bacteria. In chapter 2, we identify gut bacteria that robustly produce IAA under anaerobic conditions. Our screen revealed that these microbes also produce end products from the oxidative metabolism of other aromatic and branched-chain amino acids, which have been shown in other organisms to require the activity of 2-oxoacid:ferredoxin oxidoreductases (OFORs). Using heterologous overexpression in E. coli, we biochemically characterize an enzymatic pathway that is sufficient for anaerobic IAA production and includes an OFOR. Because the OFOR enzyme family can act on a wide range of substrates, in Chapter 3, we used enzyme assays to measure the specific activity of 13 previously uncharacterized OFOR enzymes in these IAA producers against a panel of substrates. We also investigate how enzyme structure, particularly in the active site, may contribute to this diverse substrate activity. In chapter 4, we explore how IAA production impacts cellular physiology in IAA producers, and using stable isotope tracing, we reveal a link between tryptophan oxidation into IAA and carbon fixation. Finally, in chapter 5, we outline attempts to develop genetic systems for targeted mutagenesis in these non-model gut bacteria. Collectively, this work contributes mechanistic insights into the production of IAA and other health-modifying microbial metabolites and furthers our understanding of key metabolic processes that underlie bacterial physiology in the gut.
■590 ▼aSchool code: 0212.
■650 4▼aPhysiology
■650 4▼aPathogens
■650 4▼aHydrocarbons
■650 4▼aDisease
■650 4▼aBacteria
■650 4▼aEarth
■650 4▼aUrine
■650 4▼aAmino acids
■650 4▼aDiet
■650 4▼aEnergy
■650 4▼aMetabolism
■650 4▼aProtein synthesis
■650 4▼aCells
■650 4▼aOxidation
■650 4▼aLiver
■650 4▼aAntibiotics
■650 4▼aCarbon
■650 4▼aGlucose
■650 4▼aVeins & arteries
■650 4▼aMetabolites
■650 4▼aProteomics
■650 4▼aMicrobiology
■650 4▼aImmunology
■653 ▼aIndoleacetic acid
■653 ▼aOxoacid:ferredoxin oxidoreductases
■653 ▼aGut bacteria
■690 ▼a0791
■690 ▼a0719
■690 ▼a0982
■690 ▼a0410
■71020▼aStanford University.
■7730 ▼tDissertations Abstracts International▼g87-02B.
■790 ▼a0212
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359250▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


