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Identification and Functional Analysis of an Essential Daughter Bud Assembly Complex in Toxoplasma gondii
Identification and Functional Analysis of an Essential Daughter Bud Assembly Complex in To...
Identification and Functional Analysis of an Essential Daughter Bud Assembly Complex in Toxoplasma gondii

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211152800
ISBN  
9798383705407
DDC  
574
저자명  
Rios, Rebecca Pasquarelli.
서명/저자  
Identification and Functional Analysis of an Essential Daughter Bud Assembly Complex in Toxoplasma gondii
발행사항  
[Sl] : University of California, Los Angeles, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
138 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-02, Section: B.
주기사항  
Advisor: Bradley, Peter John.
학위논문주기  
Thesis (Ph.D.)--University of California, Los Angeles, 2024.
초록/해제  
요약Toxoplasma gondii is a single-celled obligate intracellular parasite which is estimated to infect 30% of the global human population. While T. gondii infections are typically asymptomatic in healthy individuals, they can cause life-threatening complications in immunocompromised individuals and congenitally infected neonates. As current treatments are toxic and do not clear the lifelong chronic infection, a deeper understanding of parasite biology is needed to identify novel targets for therapeutic intervention. As a member of the phylum Apicomplexa, T. gondii contains several unique organelles which play critical roles in facilitating the parasite's lytic cycle, which causes the acute phase of disease. One of these unique apicomplexan organelles is the inner membrane complex (IMC), which lies directly underneath the parasite's plasma membrane and is composed of a series of flattened vesicles supported by an underlying cytoskeletal network. The IMC plays essential roles throughout the T. gondii lytic cycle by serving as the platform for the molecular machinery that controls parasite motility, stabilizing the apical complex which facilitates host cell invasion, and acting as a scaffold for developing daughter cells during parasite replication.T. gondii replicates using a unique form of internal budding called endodyogeny, in which two daughter buds are formed within the cytoplasm of a single maternal cell. Endodyogeny can be divided into four steps: bud initiation, elongation, constriction, and maturation. During this process, IMC components are added to the developing daughter cell scaffold in a tightly regulated, sequential manner. While many of the components of the IMC are known to be important for parasite fitness, most are maintained in mature parasites and play critical roles in other phases of the lytic cycle besides replication. Several IMC proteins have been identified which are found only in the IMC of daughter buds, but most are dispensable or have only moderate impacts on parasite fitness. The identification of IMC32, a daughter-specific IMC protein which recruits during bud initiation and is essential for endodyogeny, led us to hypothesize that other unidentified daughter-specific IMC proteins coordinate with IMC32 to lay the foundation of the daughter cell scaffold.Here, we report the discovery of an essential daughter bud assembly complex which lays the foundation for the daughter IMC in T. gondii. Using proximity labelling and protein-protein interaction screens, we identify two novel proteins, IMC43 and BCC0, as binding partners of IMC32. We analyze the function of each of these proteins using conditional knockdown systems which reveal that both IMC43 and BCC0 are essential for endodyogeny. We additionally use deletion analyses and functional complementation to identify which regions of IMC43 and BCC0 are essential for localization and function. By employing pairwise yeast two-hybrid assays, we determine which regions of IMC32, IMC43, and BCC0 are involved in complex formation. Finally, we assess how loss of each complex component affects each of the others. These data allow us to develop a hierarchical model for complex assembly in which BCC0 depends on IMC32 for its localization during bud initiation, and IMC32 in turn depends on IMC43 for its localization later during bud elongation. Together, this work expands our understanding of how nascent daughter buds are assembled during endodyogeny and yields ample opportunities for future studies into the function and regulation of these essential proteins in both T. gondii and other parasites.
일반주제명  
Molecular biology
일반주제명  
Microbiology
일반주제명  
Cellular biology
일반주제명  
Parasitology
키워드  
Apicomplexan
키워드  
Cell division
키워드  
Endodyogeny
키워드  
Inner membrane complex
키워드  
Toxoplasma gondii
기타저자  
University of California, Los Angeles Molecular Biology 0573
기본자료저록  
Dissertations Abstracts International. 86-02B.
전자적 위치 및 접속  
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MARC

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■035    ▼a(MiAaPQ)AAI31556479
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a574
■1001  ▼aRios,  Rebecca  Pasquarelli.
■24510▼aIdentification  and  Functional  Analysis  of  an  Essential  Daughter  Bud  Assembly  Complex  in  Toxoplasma  gondii
■260    ▼a[Sl]▼bUniversity  of  California,  Los  Angeles▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a138  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-02,  Section:  B.
■500    ▼aAdvisor:  Bradley,  Peter  John.
■5021  ▼aThesis  (Ph.D.)--University  of  California,  Los  Angeles,  2024.
■520    ▼aToxoplasma  gondii  is  a  single-celled  obligate  intracellular  parasite  which  is  estimated  to  infect  30%  of  the  global  human  population.  While  T.  gondii  infections  are  typically  asymptomatic  in  healthy  individuals,  they  can  cause  life-threatening  complications  in  immunocompromised  individuals  and  congenitally  infected  neonates.  As  current  treatments  are  toxic  and  do  not  clear  the  lifelong  chronic  infection,  a  deeper  understanding  of  parasite  biology  is  needed  to  identify  novel  targets  for  therapeutic  intervention.  As  a  member  of  the  phylum  Apicomplexa,  T.  gondii  contains  several  unique  organelles  which  play  critical  roles  in  facilitating  the  parasite's  lytic  cycle,  which  causes  the  acute  phase  of  disease.  One  of  these  unique  apicomplexan  organelles  is  the  inner  membrane  complex  (IMC),  which  lies  directly  underneath  the  parasite's  plasma  membrane  and  is  composed  of  a  series  of  flattened  vesicles  supported  by  an  underlying  cytoskeletal  network.  The  IMC  plays  essential  roles  throughout  the  T.  gondii  lytic  cycle  by  serving  as  the  platform  for  the  molecular  machinery  that  controls  parasite  motility,  stabilizing  the  apical  complex  which  facilitates  host  cell  invasion,  and  acting  as  a  scaffold  for  developing  daughter  cells  during  parasite  replication.T.  gondii  replicates  using  a  unique  form  of  internal  budding  called  endodyogeny,  in  which  two  daughter  buds  are  formed  within  the  cytoplasm  of  a  single  maternal  cell.  Endodyogeny  can  be  divided  into  four  steps:  bud  initiation,  elongation,  constriction,  and  maturation.  During  this  process,  IMC  components  are  added  to  the  developing  daughter  cell  scaffold  in  a  tightly  regulated,  sequential  manner.  While  many  of  the  components  of  the  IMC  are  known  to  be  important  for  parasite  fitness,  most  are  maintained  in  mature  parasites  and  play  critical  roles  in  other  phases  of  the  lytic  cycle  besides  replication.  Several  IMC  proteins  have  been  identified  which  are  found  only  in  the  IMC  of  daughter  buds,  but  most  are  dispensable  or  have  only  moderate  impacts  on  parasite  fitness.  The  identification  of  IMC32,  a  daughter-specific  IMC  protein  which  recruits  during  bud  initiation  and  is  essential  for  endodyogeny,  led  us  to  hypothesize  that  other  unidentified  daughter-specific  IMC  proteins  coordinate  with  IMC32  to  lay  the  foundation  of  the  daughter  cell  scaffold.Here,  we  report  the  discovery  of  an  essential  daughter  bud  assembly  complex  which  lays  the  foundation  for  the  daughter  IMC  in  T.  gondii.  Using  proximity  labelling  and  protein-protein  interaction  screens,  we  identify  two  novel  proteins,  IMC43  and  BCC0,  as  binding  partners  of  IMC32.  We  analyze  the  function  of  each  of  these  proteins  using  conditional  knockdown  systems  which  reveal  that  both  IMC43  and  BCC0  are  essential  for  endodyogeny.  We  additionally  use  deletion  analyses  and  functional  complementation  to  identify  which  regions  of  IMC43  and  BCC0  are  essential  for  localization  and  function.  By  employing  pairwise  yeast  two-hybrid  assays,  we  determine  which  regions  of  IMC32,  IMC43,  and  BCC0  are  involved  in  complex  formation.  Finally,  we  assess  how  loss  of  each  complex  component  affects  each  of  the  others.  These  data  allow  us  to  develop  a  hierarchical  model  for  complex  assembly  in  which  BCC0  depends  on  IMC32  for  its  localization  during  bud  initiation,  and  IMC32  in  turn  depends  on  IMC43  for  its  localization  later  during  bud  elongation.  Together,  this  work  expands  our  understanding  of  how  nascent  daughter  buds  are  assembled  during  endodyogeny  and  yields  ample  opportunities  for  future  studies  into  the  function  and  regulation  of  these  essential  proteins  in  both  T.  gondii  and  other  parasites.
■590    ▼aSchool  code:  0031.
■650  4▼aMolecular  biology
■650  4▼aMicrobiology
■650  4▼aCellular  biology
■650  4▼aParasitology
■653    ▼aApicomplexan
■653    ▼aCell  division
■653    ▼aEndodyogeny
■653    ▼aInner  membrane  complex
■653    ▼aToxoplasma  gondii
■690    ▼a0307
■690    ▼a0379
■690    ▼a0410
■690    ▼a0718
■71020▼aUniversity  of  California,  Los  Angeles▼bMolecular  Biology  0573.
■7730  ▼tDissertations  Abstracts  International▼g86-02B.
■790    ▼a0031
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17163845▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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