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Characterizing Three Toxoplasma Proteins Secreted into the Parasitophorous Vacuole
Characterizing Three Toxoplasma Proteins Secreted into the Parasitophorous Vacuole
Characterizing Three Toxoplasma Proteins Secreted into the Parasitophorous Vacuole

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202104848
ISBN  
9798288815102
DDC  
600
저자명  
Mendoza, Alma G.
서명/저자  
Characterizing Three Toxoplasma Proteins Secreted into the Parasitophorous Vacuole
발행사항  
[Sl] : Stanford University, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
120 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-02, Section: B.
주기사항  
Advisor: Boothroyd, John.
학위논문주기  
Thesis (Ph.D.)--Stanford University, 2025.
초록/해제  
요약Toxoplasmosis is an infection caused by a protozoan called Toxoplasma gondii. This obligate, intracellular parasite is capable of actively invading a wide variety of nucleated, mammalian host cells, producing a replicative niche in which it lives and grows called the parasitophorous vacuole (PV). Toxoplasma's ability to extensively modify this newly formed PV is made possible through the secretion of parasite proteins. One set of proteins that enable Toxoplasma's success are dense granule proteins (GRAs). Some of these GRA proteins have been shown to exert their effects while embedded in the PV membrane (PVM) while others have been shown to cross the PVM to reach the host cell's cytosol or nucleus. Recent advances in proteomics enabled the discovery of novel host and parasite proteins located within the PV or at the PVM. My goal has been to determine the roles played by three such parasite proteins during infection of human cells. In Chapter 1, I give a comprehensive overview of Toxoplasma gondii and the diverse functions attributed to GRAs during infection. In Chapter 2, I describe a proximity-labeling approach used to identify novel host and parasite proteins within the PV/PVM, including three previously uncharacterized dense granule proteins, GRA61, GRA62 and GRA63. Chapter 3 describes a reverse genetic approach coupled with proteomic and transcriptomic assays to explore the function of the three novel GRAs identified in Chapter 2. I present evidence that GRA61 physically associates with and modulates the function of a highly abundant, secreted GRA ("NTPase") that degrades ATP in the PV. I show that in the absence of GRA61, the NTPase gene is dramatically downregulated suggesting GRA61 normally helps contain the function of an otherwise deleterious enzyme. Combined with the fact that GRA61 includes a predicted thioredoxin domain and the NTPase has seven disulfide bonds and requires reduction to be active, these results suggest that GRA61 operates as a break on the NTPase activity until the appropriate time and place are reached within the infected cell. In Chapter 4, I discuss the overall conclusions of this thesis and describe some potential avenues for future investigation.
일반주제명  
Infections
일반주제명  
Pathogens
일반주제명  
Womens health
일반주제명  
Cysts
일반주제명  
Labeling
일반주제명  
Mitochondria
일반주제명  
Pregnancy
일반주제명  
Biology
일반주제명  
Virulence
일반주제명  
Fetuses
일반주제명  
Malaria
일반주제명  
CRISPR
일반주제명  
Feces
일반주제명  
Fibroblasts
일반주제명  
Parasites
일반주제명  
Immune system
일반주제명  
Genetic engineering
일반주제명  
Medical research
일반주제명  
Protozoa
일반주제명  
Viral infections
일반주제명  
Cats
일반주제명  
Proteomics
일반주제명  
Biochemistry
일반주제명  
Cellular biology
일반주제명  
Parasitology
키워드  
Toxoplasma gondii
키워드  
Granule proteins
키워드  
Toxoplasmosis
기타저자  
Stanford University.
기본자료저록  
Dissertations Abstracts International. 87-02B.
전자적 위치 및 접속  
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MARC

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■001000017359196
■00520260202104848
■006m          o    d                
■007cr#unu||||||||
■020    ▼a9798288815102
■035    ▼a(MiAaPQ)AAI32200929
■035    ▼a(MiAaPQ)Stanfordcb008mz8641
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a600
■1001  ▼aMendoza,  Alma  G.
■24510▼aCharacterizing  Three  Toxoplasma  Proteins  Secreted  into  the  Parasitophorous  Vacuole
■260    ▼a[Sl]▼bStanford  University▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a120  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-02,  Section:  B.
■500    ▼aAdvisor:  Boothroyd,  John.
■5021  ▼aThesis  (Ph.D.)--Stanford  University,  2025.
■520    ▼aToxoplasmosis  is  an  infection  caused  by  a  protozoan  called  Toxoplasma  gondii.  This  obligate,  intracellular  parasite  is  capable  of  actively  invading  a  wide  variety  of  nucleated,  mammalian  host  cells,  producing  a  replicative  niche  in  which  it  lives  and  grows  called  the  parasitophorous  vacuole  (PV).  Toxoplasma's  ability  to  extensively  modify  this  newly  formed  PV  is  made  possible  through  the  secretion  of  parasite  proteins.  One  set  of  proteins  that  enable  Toxoplasma's  success  are  dense  granule  proteins  (GRAs).  Some  of  these  GRA  proteins  have  been  shown  to  exert  their  effects  while  embedded  in  the  PV  membrane  (PVM)  while  others  have  been  shown  to  cross  the  PVM  to  reach  the  host  cell's  cytosol  or  nucleus.  Recent  advances  in  proteomics  enabled  the  discovery  of  novel  host  and  parasite  proteins  located  within  the  PV  or  at  the  PVM.  My  goal  has  been  to  determine  the  roles  played  by  three  such  parasite  proteins  during  infection  of  human  cells.  In  Chapter  1,  I  give  a  comprehensive  overview  of  Toxoplasma  gondii  and  the  diverse  functions  attributed  to  GRAs  during  infection.  In  Chapter  2,  I  describe  a  proximity-labeling  approach  used  to  identify  novel  host  and  parasite  proteins  within  the  PV/PVM,  including  three  previously  uncharacterized  dense  granule  proteins,  GRA61,  GRA62  and  GRA63.  Chapter  3  describes  a  reverse  genetic  approach  coupled  with  proteomic  and  transcriptomic  assays  to  explore  the  function  of  the  three  novel  GRAs  identified  in  Chapter  2.  I  present  evidence  that  GRA61  physically  associates  with  and  modulates  the  function  of  a  highly  abundant,  secreted  GRA  ("NTPase")  that  degrades  ATP  in  the  PV.  I  show  that  in  the  absence  of  GRA61,  the  NTPase  gene  is  dramatically  downregulated  suggesting  GRA61  normally  helps  contain  the  function  of  an  otherwise  deleterious  enzyme.  Combined  with  the  fact  that  GRA61  includes  a  predicted  thioredoxin  domain  and  the  NTPase  has  seven  disulfide  bonds  and  requires  reduction  to  be  active,  these  results  suggest  that  GRA61  operates  as  a  break  on  the  NTPase  activity  until  the  appropriate  time  and  place  are  reached  within  the  infected  cell.  In  Chapter  4,  I  discuss  the  overall  conclusions  of  this  thesis  and  describe  some  potential  avenues  for  future  investigation.
■590    ▼aSchool  code:  0212.
■650  4▼aInfections
■650  4▼aPathogens
■650  4▼aWomens  health
■650  4▼aCysts
■650  4▼aLabeling
■650  4▼aMitochondria
■650  4▼aPregnancy
■650  4▼aBiology
■650  4▼aVirulence
■650  4▼aFetuses
■650  4▼aMalaria
■650  4▼aCRISPR
■650  4▼aFeces
■650  4▼aFibroblasts
■650  4▼aParasites
■650  4▼aImmune  system
■650  4▼aGenetic  engineering
■650  4▼aMedical  research
■650  4▼aProtozoa
■650  4▼aViral  infections
■650  4▼aCats
■650  4▼aProteomics
■650  4▼aBiochemistry
■650  4▼aCellular  biology
■650  4▼aParasitology
■653    ▼aToxoplasma  gondii
■653    ▼aGranule  proteins
■653    ▼aToxoplasmosis
■690    ▼a0306
■690    ▼a0487
■690    ▼a0379
■690    ▼a0718
■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=T17359196▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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