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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
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  
Indoleacetic acid
키워드  
Oxoacid:ferredoxin oxidoreductases
키워드  
Gut bacteria
기타저자  
Stanford University.
기본자료저록  
Dissertations Abstracts International. 87-02B.
전자적 위치 및 접속  
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■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.

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