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Characterizing Three Toxoplasma Proteins Secreted into the Parasitophorous Vacuole
Characterizing Three Toxoplasma Proteins Secreted into the Parasitophorous Vacuole
Detailed Information
- 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
- Granule proteins
- 키워드
- Toxoplasmosis
- 기타저자
- Stanford University.
- 기본자료저록
- Dissertations Abstracts International. 87-02B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■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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