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The Biochemical and Structural Basis of Get3d'S Role in Photosynthesis
The Biochemical and Structural Basis of Get3d'S Role in Photosynthesis
The Biochemical and Structural Basis of Get3d'S Role in Photosynthesis

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자료유형  
 학위논문 서양
최종처리일시  
20260202104754
ISBN  
9798290651996
DDC  
574
저자명  
Barlow, Alexandra N.
서명/저자  
The Biochemical and Structural Basis of Get3dS Role in Photosynthesis
발행사항  
[Sl] : California Institute of Technology, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
134 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-01, Section: B.
주기사항  
Advisor: Clemons, Bil.
학위논문주기  
Thesis (Ph.D.)--California Institute of Technology, 2025.
초록/해제  
요약Tail-anchored (TA) membrane proteins, defined by a single C-terminal transmembrane domain, are inserted into the endoplasmic reticulum (ER) membrane via the guided entry of tail-anchored proteins pathway. The central targeting factor of this pathway is Get3, an ATPase that receives TA clients from upstream chaperones and mediates their delivery to the ER. Here, we identify and characterize a unique Get3 homolog, termed Get3d, distinguished by a C-terminal \uD835\uDEFC-crystallin domain (\uD835\uDEFCCD). We show that Get3d is conserved across plants and photosynthetic bacteria and demonstrate that it localizes to the chloroplast in plants. We present the X-ray crystal structure of Get3d, revealing unique features including the \uD835\uDEFCCD and a clientbinding chamber in the closed state. Biochemical analyses confirm that Get3d is an active ATPase capable of binding TA proteins in vitro.To investigate its physiological role, we identified the plant-like Get3d homolog in Synechocystissp. PCC 6803 and generated deletion and complementation strains. Loss of Get3d impairs cell growth and pigment production, and proteomic analyses reveal widespread dysregulation, including up-regulation of transcriptional regulators and down-regulation of redox-associated proteins-suggesting a role in redox homeostasis. Complementation studies show that ATPase activity is necessary for restoring the expression of key photosynthesis-related proteins, while the \uD835\uDEFCCD is critical for maintaining Get3d protein stability in vivo.Finally, co-immunoprecipitation coupled to mass spectrometry identifies putative Get3d interaction partners enriched in membraneassociated and photosynthetic proteins. Together, these findings establish Get3d as a biochemically distinct and functionally essential member of the Get3 family, with a potential role in redox regulation and photosynthetic homeostasis in diverse photosynthetic organisms.
일반주제명  
Membranes
일반주제명  
Mass spectrometry
일반주제명  
Signal transduction
일반주제명  
Plasma
일반주제명  
Endoplasmic reticulum
일반주제명  
Ribonucleic acid--RNA
일반주제명  
Fourier transforms
일반주제명  
Protons
일반주제명  
Photosynthesis
일반주제명  
Chloroplasts
일반주제명  
Scientific imaging
일반주제명  
Genomes
일반주제명  
Energy
일반주제명  
Cyanobacteria
일반주제명  
Lipids
일반주제명  
Polypeptides
기타저자  
California Institute of Technology Chemistry and Chemical Engineering
기본자료저록  
Dissertations Abstracts International. 87-01B.
전자적 위치 및 접속  
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MARC

 008260126s2025        us                              c    eng  d
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■006m          o    d                
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■020    ▼a9798290651996
■035    ▼a(MiAaPQ)AAI32151366
■035    ▼a(MiAaPQ)Caltech17329
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a574
■1001  ▼aBarlow,  Alexandra  N.
■24510▼aThe  Biochemical  and  Structural  Basis  of  Get3d'S  Role  in  Photosynthesis
■260    ▼a[Sl]▼bCalifornia  Institute  of  Technology▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a134  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-01,  Section:  B.
■500    ▼aAdvisor:  Clemons,  Bil.
■5021  ▼aThesis  (Ph.D.)--California  Institute  of  Technology,  2025.
■520    ▼aTail-anchored  (TA)  membrane  proteins,  defined  by  a  single  C-terminal  transmembrane  domain,  are  inserted  into  the  endoplasmic  reticulum  (ER)  membrane  via  the  guided  entry  of  tail-anchored  proteins  pathway.  The  central  targeting  factor  of  this  pathway  is  Get3,  an  ATPase  that  receives  TA  clients  from  upstream  chaperones  and  mediates  their  delivery  to  the  ER.  Here,  we  identify  and  characterize  a  unique  Get3  homolog,  termed  Get3d,  distinguished  by  a  C-terminal  \uD835\uDEFC-crystallin  domain  (\uD835\uDEFCCD).  We  show  that  Get3d  is  conserved  across  plants  and  photosynthetic  bacteria  and  demonstrate  that  it  localizes  to  the  chloroplast  in  plants.  We  present  the  X-ray  crystal  structure  of  Get3d,  revealing  unique  features  including  the  \uD835\uDEFCCD  and  a  clientbinding  chamber  in  the  closed  state.  Biochemical  analyses  confirm  that  Get3d  is  an  active  ATPase  capable  of  binding  TA  proteins  in  vitro.To  investigate  its  physiological  role,  we  identified  the  plant-like  Get3d  homolog  in  Synechocystissp.  PCC  6803  and  generated  deletion  and  complementation  strains.  Loss  of  Get3d  impairs  cell  growth  and  pigment  production,  and  proteomic  analyses  reveal  widespread  dysregulation,  including  up-regulation  of  transcriptional  regulators  and  down-regulation  of  redox-associated  proteins-suggesting  a  role  in  redox  homeostasis.  Complementation  studies  show  that  ATPase  activity  is  necessary  for  restoring  the  expression  of  key  photosynthesis-related  proteins,  while  the  \uD835\uDEFCCD  is  critical  for  maintaining  Get3d  protein  stability  in  vivo.Finally,  co-immunoprecipitation  coupled  to  mass  spectrometry  identifies  putative  Get3d  interaction  partners  enriched  in  membraneassociated  and  photosynthetic  proteins.  Together,  these  findings  establish  Get3d  as  a  biochemically  distinct  and  functionally  essential  member  of  the  Get3  family,  with  a  potential  role  in  redox  regulation  and  photosynthetic  homeostasis  in  diverse  photosynthetic  organisms.
■590    ▼aSchool  code:  0037.
■650  4▼aMembranes
■650  4▼aMass  spectrometry
■650  4▼aSignal  transduction
■650  4▼aPlasma
■650  4▼aEndoplasmic  reticulum
■650  4▼aRibonucleic  acid--RNA
■650  4▼aFourier  transforms
■650  4▼aProtons
■650  4▼aPhotosynthesis
■650  4▼aChloroplasts
■650  4▼aScientific  imaging
■650  4▼aGenomes
■650  4▼aEnergy
■650  4▼aCyanobacteria
■650  4▼aLipids
■650  4▼aPolypeptides
■690    ▼a0791
■71020▼aCalifornia  Institute  of  Technology▼bChemistry  and  Chemical  Engineering.
■7730  ▼tDissertations  Abstracts  International▼g87-01B.
■790    ▼a0037
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358801▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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