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The Function of TerC Proteins in Metal Homeostasis
The Function of TerC Proteins in Metal Homeostasis
The Function of TerC Proteins in Metal Homeostasis

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20250211151319
ISBN  
9798382841731
DDC  
576
저자명  
He, Bixi.
서명/저자  
The Function of TerC Proteins in Metal Homeostasis
발행사항  
[Sl] : Cornell University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
195 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
주기사항  
Advisor: Helmann, John.
학위논문주기  
Thesis (Ph.D.)--Cornell University, 2024.
초록/해제  
요약Bacillus subtilis is a Gram-positive model organism found worldwide in environments with different nutrients and trace elements. To adapt to these changing growth conditions, B. subtilis has a high capacity for protein secretion and employs various systems to maintain the intracellular metal levels. Manganese is an important transition metal and functions as the cofactor in different metalloenzymes. Cytosolic Mn-requiring enzymes can acquire metals from buffered intracellular pools, but the mechanisms of metalation of exported enzymes are unclear. Here, we show that widely conserved TerC family proteins function in metalation of exoenzymes during or after their secretion process through the general secretion (Sec-dependent) pathway. B. subtilis cells lacking MeeF and MeeY have a reduced capacity for protein secretion and a dramatically reduced level of manganese in the secreted proteome. In the absence of TerC proteins, misfolded or unfolded proteins may stall the secretion translocon (SecYEG). The membrane protease FtsH, which can degrade dysfunctional SecY, is essential for cell viability. MeeF and MeeY can also influence the efficient function of Mn-dependent lipoteichoic acid synthase LtaS by metalation of Mn into its extracytoplasmic active site. Overall, MeeF and MeeY have functions in the co-translocational metalation of Mn-requiring membrane and extracellular enzymes (Chapter 2). The jamming of translocon caused by a lack of TerC proteins MeeF and MeeY may influence other cellular processes in B. subtilis. We provide evidence that MeeF and MeeY are involved in the swarming, sporulation, and natural competence. The double mutant meeFmeeY has defective swarming motility and decreased flagella production. Besides, cells lacking MeeF and MeeY in CU1065 strain background show defects in sporulation and a lower transformation efficiency. These defects indicate that clients other than LtaS require TerC proteins for metalation, and the impaired secretion in the cells without TerC proteins can cause pleiotropic phenotypes in B. subtilis (Chapter 3). Finally, we discuss the strategies employed by bacterial cells to metalate membrane-bound and secreted metalloenzymes which are involved in cell envelope homeostasis (Chapter 4).
일반주제명  
Microbiology
일반주제명  
Cellular biology
일반주제명  
Molecular biology
키워드  
Bacillus subtilis
키워드  
Protein secretion
키워드  
Metalloenzymes
키워드  
Extracellular enzymes
기타저자  
Cornell University Microbiology
기본자료저록  
Dissertations Abstracts International. 85-12B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aHe,  Bixi.▼0(orcid)0000-0002-2796-7620
■24510▼aThe  Function  of  TerC  Proteins  in  Metal  Homeostasis
■260    ▼a[Sl]▼bCornell  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a195  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-12,  Section:  B.
■500    ▼aAdvisor:  Helmann,  John.
■5021  ▼aThesis  (Ph.D.)--Cornell  University,  2024.
■520    ▼aBacillus  subtilis  is  a  Gram-positive  model  organism  found  worldwide  in  environments  with  different  nutrients  and  trace  elements.  To  adapt  to  these  changing  growth  conditions,  B.  subtilis  has  a  high  capacity  for  protein  secretion  and  employs  various  systems  to  maintain  the  intracellular  metal  levels.  Manganese  is  an  important  transition  metal  and  functions  as  the  cofactor  in  different  metalloenzymes.  Cytosolic  Mn-requiring  enzymes  can  acquire  metals  from  buffered  intracellular  pools,  but  the  mechanisms  of  metalation  of  exported  enzymes  are  unclear.  Here,  we  show  that  widely  conserved  TerC  family  proteins  function  in  metalation  of  exoenzymes  during  or  after  their  secretion  process  through  the  general  secretion  (Sec-dependent)  pathway.  B.  subtilis  cells  lacking  MeeF  and  MeeY  have  a  reduced  capacity  for  protein  secretion  and  a  dramatically  reduced  level  of  manganese  in  the  secreted  proteome.  In  the  absence  of  TerC  proteins,  misfolded  or  unfolded  proteins  may  stall  the  secretion  translocon  (SecYEG).  The  membrane  protease  FtsH,  which  can  degrade  dysfunctional  SecY,  is  essential  for  cell  viability.  MeeF  and  MeeY  can  also  influence  the  efficient  function  of  Mn-dependent  lipoteichoic  acid  synthase  LtaS  by  metalation  of  Mn  into  its  extracytoplasmic  active  site.  Overall,  MeeF  and  MeeY  have  functions  in  the  co-translocational  metalation  of  Mn-requiring  membrane  and  extracellular  enzymes  (Chapter  2).  The  jamming  of  translocon  caused  by  a  lack  of  TerC  proteins  MeeF  and  MeeY  may  influence  other  cellular  processes  in  B.  subtilis.  We  provide  evidence  that  MeeF  and  MeeY  are  involved  in  the  swarming,  sporulation,  and  natural  competence.  The  double  mutant  meeFmeeY  has  defective  swarming  motility  and  decreased  flagella  production.  Besides,  cells  lacking  MeeF  and  MeeY  in  CU1065  strain  background  show  defects  in  sporulation  and  a  lower  transformation  efficiency.  These  defects  indicate  that  clients  other  than  LtaS  require  TerC  proteins  for  metalation,  and  the  impaired  secretion  in  the  cells  without  TerC  proteins  can  cause  pleiotropic  phenotypes  in  B.  subtilis  (Chapter  3).  Finally,  we  discuss  the  strategies  employed  by  bacterial  cells  to  metalate  membrane-bound  and  secreted  metalloenzymes  which  are  involved  in  cell  envelope  homeostasis  (Chapter  4).
■590    ▼aSchool  code:  0058.
■650  4▼aMicrobiology
■650  4▼aCellular  biology
■650  4▼aMolecular  biology
■653    ▼aBacillus  subtilis
■653    ▼aProtein  secretion
■653    ▼aMetalloenzymes
■653    ▼aExtracellular  enzymes
■690    ▼a0410
■690    ▼a0379
■690    ▼a0307
■71020▼aCornell  University▼bMicrobiology.
■7730  ▼tDissertations  Abstracts  International▼g85-12B.
■790    ▼a0058
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17161166▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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