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At the Interface: Unlocking Enzyme Partnerships in Bacterial Cell-Wall Remodeling
At the Interface: Unlocking Enzyme Partnerships in Bacterial Cell-Wall Remodeling
At the Interface: Unlocking Enzyme Partnerships in Bacterial Cell-Wall Remodeling

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202105305
ISBN  
9798270226244
DDC  
574
저자명  
Soriano, Berliza Marie.
서명/저자  
At the Interface: Unlocking Enzyme Partnerships in Bacterial Cell-Wall Remodeling
발행사항  
[Sl] : University of California, San Francisco, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
177 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
주기사항  
Advisor: Williams, Allison Hillary.
학위논문주기  
Thesis (Ph.D.)--University of California, San Francisco, 2025.
초록/해제  
요약Gram-negative bacterial pathogens rely on a dynamic peptidoglycan (PG) cell wall to maintain viability, withstand antibiotic stress, and interface with their hosts. Although numerous PG-active enzymes and PG-sensing proteins have been identified, the principles that govern how their activities are structurally coordinated, acutely perturbed, and encoded in primary sequence remain incompletely defined. This dissertation addresses these questions by integrating high-resolution structural biology, nanobody-based perturbation, and machine learning to elucidate mechanisms of PG remodeling and recognition across multiple scales, from a single enzyme complex to proteome-wide families of PG-binding domains.Chapter 1 delineates the structural and biochemical basis of conformational gating in the LtgA-Ape1 PG-remodeling complex from Neisseria meningitidis. Single-particle cryo-electron microscopy, structure-guided mutagenesis, and kinetic analyses reveal how Ape1 binding reorganizes the LtgA active site and interface to control substrate access and product release. Targeted mutations validate key gating elements and decouple catalysis from complex assembly, illustrating how a non-essential complex can fine-tune cell-wall processing in response to local context. Chapter 2 establishes a high-throughput nanobody discovery and characterization pipeline targeting the soluble lytic transglycosylase Slt from Pseudomonas aeruginosa. Optimized Slt production, yeast-display selections, and functional profiling of Slt-binding nanobodies identify binders that differentially modulate Slt activity and binding. This workflow yields a modular toolkit for acute perturbation of cell-wall enzymes and provides tractable starting points for the development of inhibitors and mechanistic probes. Chapter 3 presents a global, sequence-based perspective on PG recognition. Curated positive and negative sets of experimentally supported PG-binding domains are used to train a recurrent neural network on k-mer representations of protein sequences, coupled to a high-throughput motif-discovery framework. This approach uncovers over-represented sequence patterns associated with PG binding across diverse folds and taxonomic groups, predicts previously unannotated PG-binding candidates, and highlights convergent solutions to recognizing a chemically conserved yet structurally heterogeneous polymer. Collectively, these studies define concrete molecular mechanisms, generate versatile tools for perturbing cell-wall enzymes, and propose testable sequence features that can guide the discovery of new PG-interacting proteins. By integrating structural biology, biochemistry, and machine learning, this work offers a multi-scale perspective on bacterial envelope biology and suggests novel strategies for sensitizing problematic Gram-negative pathogens to existing antibiotics.
일반주제명  
Biology
일반주제명  
Biochemistry
일반주제명  
Chemistry
일반주제명  
Microbiology
키워드  
LtgA-Ape1
키워드  
Nanobody screening
키워드  
Neisseria meningitidis
키워드  
Peptidoglycan remodeling
키워드  
PG-binding recognition
키워드  
Structural biology
기타저자  
University of California, San Francisco Chemistry and Chemical Biology
기본자료저록  
Dissertations Abstracts International. 87-06B.
전자적 위치 및 접속  
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MARC

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■035    ▼a(MiAaPQ)AAI32283111
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a574
■1001  ▼aSoriano,  Berliza  Marie.
■24510▼aAt  the  Interface:  Unlocking  Enzyme  Partnerships  in  Bacterial  Cell-Wall  Remodeling
■260    ▼a[Sl]▼bUniversity  of  California,  San  Francisco▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a177  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-06,  Section:  B.
■500    ▼aAdvisor:  Williams,  Allison  Hillary.
■5021  ▼aThesis  (Ph.D.)--University  of  California,  San  Francisco,  2025.
■520    ▼aGram-negative  bacterial  pathogens  rely  on  a  dynamic  peptidoglycan  (PG)  cell  wall  to  maintain  viability,  withstand  antibiotic  stress,  and  interface  with  their  hosts.  Although  numerous  PG-active  enzymes  and  PG-sensing  proteins  have  been  identified,  the  principles  that  govern  how  their  activities  are  structurally  coordinated,  acutely  perturbed,  and  encoded  in  primary  sequence  remain  incompletely  defined.  This  dissertation  addresses  these  questions  by  integrating  high-resolution  structural  biology,  nanobody-based  perturbation,  and  machine  learning  to  elucidate  mechanisms  of  PG  remodeling  and  recognition  across  multiple  scales,  from  a  single  enzyme  complex  to  proteome-wide  families  of  PG-binding  domains.Chapter  1  delineates  the  structural  and  biochemical  basis  of  conformational  gating  in  the  LtgA-Ape1  PG-remodeling  complex  from  Neisseria  meningitidis.  Single-particle  cryo-electron  microscopy,  structure-guided  mutagenesis,  and  kinetic  analyses  reveal  how  Ape1  binding  reorganizes  the  LtgA  active  site  and  interface  to  control  substrate  access  and  product  release.  Targeted  mutations  validate  key  gating  elements  and  decouple  catalysis  from  complex  assembly,  illustrating  how  a  non-essential  complex  can  fine-tune  cell-wall  processing  in  response  to  local  context.  Chapter  2  establishes  a  high-throughput  nanobody  discovery  and  characterization  pipeline  targeting  the  soluble  lytic  transglycosylase  Slt  from  Pseudomonas  aeruginosa.  Optimized  Slt  production,  yeast-display  selections,  and  functional  profiling  of  Slt-binding  nanobodies  identify  binders  that  differentially  modulate  Slt  activity  and  binding.  This  workflow  yields  a  modular  toolkit  for  acute  perturbation  of  cell-wall  enzymes  and  provides  tractable  starting  points  for  the  development  of  inhibitors  and  mechanistic  probes.  Chapter  3  presents  a  global,  sequence-based  perspective  on  PG  recognition.  Curated  positive  and  negative  sets  of  experimentally  supported  PG-binding  domains  are  used  to  train  a  recurrent  neural  network  on  k-mer  representations  of  protein  sequences,  coupled  to  a  high-throughput  motif-discovery  framework.  This  approach  uncovers  over-represented  sequence  patterns  associated  with  PG  binding  across  diverse  folds  and  taxonomic  groups,  predicts  previously  unannotated  PG-binding  candidates,  and  highlights  convergent  solutions  to  recognizing  a  chemically  conserved  yet  structurally  heterogeneous  polymer.  Collectively,  these  studies  define  concrete  molecular  mechanisms,  generate  versatile  tools  for  perturbing  cell-wall  enzymes,  and  propose  testable  sequence  features  that  can  guide  the  discovery  of  new  PG-interacting  proteins.  By  integrating  structural  biology,  biochemistry,  and  machine  learning,  this  work  offers  a  multi-scale  perspective  on  bacterial  envelope  biology  and  suggests  novel  strategies  for  sensitizing  problematic  Gram-negative  pathogens  to  existing  antibiotics.
■590    ▼aSchool  code:  0034.
■650  4▼aBiology
■650  4▼aBiochemistry
■650  4▼aChemistry
■650  4▼aMicrobiology
■653    ▼aLtgA-Ape1
■653    ▼aNanobody  screening
■653    ▼aNeisseria  meningitidis
■653    ▼aPeptidoglycan  remodeling
■653    ▼aPG-binding  recognition
■653    ▼aStructural  biology
■690    ▼a0306
■690    ▼a0487
■690    ▼a0485
■690    ▼a0410
■71020▼aUniversity  of  California,  San  Francisco▼bChemistry  and  Chemical  Biology.
■7730  ▼tDissertations  Abstracts  International▼g87-06B.
■790    ▼a0034
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360110▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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