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Regulation of Recombinant Synaptic Fusion Pores
Regulation of Recombinant Synaptic Fusion Pores
Regulation of Recombinant Synaptic Fusion Pores

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211152644
ISBN  
9798383564707
DDC  
574.191
저자명  
Wu, Lanxi.
서명/저자  
Regulation of Recombinant Synaptic Fusion Pores
발행사항  
[Sl] : The University of Wisconsin - Madison, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
174 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-01, Section: B.
주기사항  
Advisor: Chapman, Edwin.
학위논문주기  
Thesis (Ph.D.)--The University of Wisconsin - Madison, 2024.
초록/해제  
요약Synaptic vesicle exocytosis results neurotransmitter release and is mainly mediated by soluble N-ethylmaleimide sensitive factor attachment protein receptors as the core fusion proteins with additional proteins and lipid molecules playing key roles in the fusion pathway. Fusion pore is the first crucial and short-lived intermediate in this pathway. Studying the dynamics and structure of the fusion pore is fundamental and crucial to understanding the mechanisms of exocytosis and neurotransmission. Recently developed technique combined nanodisc technology and black-lipid-membrane electrophysiology (ND-BLM system). The small sized NDs restrict the dilation of the fusion pore, and the BLM system allows a fast-sampling rate for measuring fusion pore activities at a single pore level. This dissertation focuses on using the ND-BLM system to study molecular factors that regulate fusion pore properties. Chapter II of this dissertation focused on a lipid molecule, cholesterol, which has been reported to affect SNARE-mediated exocytosis and fusion pore dynamic. Using the ND-BLM system, cholesterol is shown to significantly stabilize the fusion pore at the open state. Further study shows that these effects are attributed to the known role of cholesterol that alters membrane bending rigidity via the manipulation of unsaturated acyl-chains of phospholipids. To conclude, Chapter II shows that cholesterol stabilizes the fusion pore at the open state via modulating membrane bending rigidity. Chapter III focuses on a fusion accessory protein, complexin (Cpx). The C-terminal amphipathic helix of mammalian Cpx II forms pores on the membrane as well as budding vesicles from the membrane. In the ND-BLM system, this C-terminal amphipathic helix is shown to influence both the structure and the dynamics of the fusion pore. With these observations, Chapter III concludes that the membrane remodeling activity of Cpx promotes the recombinant fusion pore to open and then stabilize at the open state. After some efforts in understanding the molecular mechanism the regulation of the fusion pores, Chapter IV, future direction, continues to study the fusion pore dilation. Large sized NDs are used to allow further dilation of the fusion pore. The study of pore dilation will provide information about the regulation between kiss-and-run exocytosis and full-collapse exocytosis.
일반주제명  
Biophysics
일반주제명  
Neurosciences
일반주제명  
Physiology
일반주제명  
Biochemistry
키워드  
Cholesterol
키워드  
Complexin
키워드  
Exocytosis
키워드  
Fusion pores
키워드  
Membrane fusion
기타저자  
The University of Wisconsin - Madison Biophysics
기본자료저록  
Dissertations Abstracts International. 86-01B.
전자적 위치 및 접속  
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MARC

 008250123s2024        us                              c    eng  d
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■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a574.191
■1001  ▼aWu,  Lanxi.
■24510▼aRegulation  of  Recombinant  Synaptic  Fusion  Pores
■260    ▼a[Sl]▼bThe  University  of  Wisconsin  -  Madison▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a174  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-01,  Section:  B.
■500    ▼aAdvisor:  Chapman,  Edwin.
■5021  ▼aThesis  (Ph.D.)--The  University  of  Wisconsin  -  Madison,  2024.
■520    ▼aSynaptic  vesicle  exocytosis  results  neurotransmitter  release  and  is  mainly  mediated  by  soluble  N-ethylmaleimide  sensitive  factor  attachment  protein  receptors  as  the  core  fusion  proteins  with  additional  proteins  and  lipid  molecules  playing  key  roles  in  the  fusion  pathway.  Fusion  pore  is  the  first  crucial  and  short-lived  intermediate  in  this  pathway.  Studying  the  dynamics  and  structure  of  the  fusion  pore  is  fundamental  and  crucial  to  understanding  the  mechanisms  of  exocytosis  and  neurotransmission.  Recently  developed  technique  combined  nanodisc  technology  and  black-lipid-membrane  electrophysiology  (ND-BLM  system).  The  small  sized  NDs  restrict  the  dilation  of  the  fusion  pore,  and  the  BLM  system  allows  a  fast-sampling  rate  for  measuring  fusion  pore  activities  at  a  single  pore  level.  This  dissertation  focuses  on  using  the  ND-BLM  system  to  study  molecular  factors  that  regulate  fusion  pore  properties.  Chapter  II  of  this  dissertation  focused  on  a  lipid  molecule,  cholesterol,  which  has  been  reported  to  affect  SNARE-mediated  exocytosis  and  fusion  pore  dynamic.  Using  the  ND-BLM  system,  cholesterol  is  shown  to  significantly  stabilize  the  fusion  pore  at  the  open  state.  Further  study  shows  that  these  effects  are  attributed  to  the  known  role  of  cholesterol  that  alters  membrane  bending  rigidity  via  the  manipulation  of  unsaturated  acyl-chains  of  phospholipids.  To  conclude,  Chapter  II  shows  that  cholesterol  stabilizes  the  fusion  pore  at  the  open  state  via  modulating  membrane  bending  rigidity.  Chapter  III  focuses  on  a  fusion  accessory  protein,  complexin  (Cpx).  The  C-terminal  amphipathic  helix  of  mammalian  Cpx  II  forms  pores  on  the  membrane  as  well  as  budding  vesicles  from  the  membrane.  In  the  ND-BLM  system,  this  C-terminal  amphipathic  helix  is  shown  to  influence  both  the  structure  and  the  dynamics  of  the  fusion  pore.  With  these  observations,  Chapter  III  concludes  that  the  membrane  remodeling  activity  of  Cpx  promotes  the  recombinant  fusion  pore  to  open  and  then  stabilize  at  the  open  state.  After  some  efforts  in  understanding  the  molecular  mechanism  the  regulation  of  the  fusion  pores,  Chapter  IV,  future  direction,  continues  to  study  the  fusion  pore  dilation.  Large  sized  NDs  are  used  to  allow  further  dilation  of  the  fusion  pore.  The  study  of  pore  dilation  will  provide  information  about  the  regulation  between  kiss-and-run  exocytosis  and  full-collapse  exocytosis.
■590    ▼aSchool  code:  0262.
■650  4▼aBiophysics
■650  4▼aNeurosciences
■650  4▼aPhysiology
■650  4▼aBiochemistry
■653    ▼aCholesterol
■653    ▼aComplexin
■653    ▼aExocytosis
■653    ▼aFusion  pores
■653    ▼aMembrane  fusion
■690    ▼a0786
■690    ▼a0317
■690    ▼a0487
■690    ▼a0719
■71020▼aThe  University  of  Wisconsin  -  Madison▼bBiophysics.
■7730  ▼tDissertations  Abstracts  International▼g86-01B.
■790    ▼a0262
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17163254▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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