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Biochemical Characterization of Interactions Between O-GlcNac Transferase and Its Protein Binding Partners
Biochemical Characterization of Interactions Between O-GlcNac Transferase and Its Protein ...
Biochemical Characterization of Interactions Between O-GlcNac Transferase and Its Protein Binding Partners

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자료유형  
 학위논문 서양
최종처리일시  
20260202103012
ISBN  
9798280720770
DDC  
574
저자명  
Hammel, Forrest A.
서명/저자  
Biochemical Characterization of Interactions Between O-GlcNac Transferase and Its Protein Binding Partners
발행사항  
[Sl] : Harvard University, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
225 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
주기사항  
Advisor: Walker, Suzanne.
학위논문주기  
Thesis (Ph.D.)--Harvard University, 2025.
초록/해제  
요약O-GlcNAc transferase (OGT) is an essential mammalian enzyme that is solely responsible for the post-translational modification of O-GlcNAcylation, the addition of N-acetyl-D-glucosamine (GlcNAc) onto serine and threonine sidechains on thousands of proteins in the nucleus and cytoplasm. OGT catalyzes another post-translational modification: the cleavage of host cell factor 1 (HCF-1), which it does via O-GlcNAcylation of a glutamate residue in one of six highly conserved proteolytic repeats. OGT also engages in a wide variety of protein complexes, facilitated primarily by its superhelical tetratricopeptide repeat (TPR) domain. Previous work from the lab has demonstrated that OGT's O-GlcNAcylation and noncatalytic scaffolding functions are essential for cellular proliferation.In this thesis, I build on previous notions of interactions between OGT and both its protein substrates and non-substrate interactors, defining features that drive these essential functions. Chapter 2 details a series of work performed in collaboration with other members of the Walker lab, studying the effects of mutations and truncations within the TPR domain on OGT's functions and its ability to support cell proliferation; we show that truncation of OGT's N-terminal TPRs impacts viability and all three functions, while preventing OGT homodimerization leads to increased cell growth. Additionally, in that chapter, I show that changes to protein-interacting features in the TPR lumen do not impact all of OGT's substrates equally. In Chapter 3, I harness TR-FRET technology to develop a quantitative binding assay for OGT-substrate interactions. Using that assay, I identify a polypeptide derived from HCF-1's proteolytic repeats, HCF3R, that has picomolar affinity and inhibits OGT in vitro and in cells. I then modify this probe to create a cellular OGT inhibitor that can be switched on and off by addition of two small molecules. In Chapter 4, I use a combination of biochemical and structural tools to interrogate the nature of the OGT-HCF3R interaction, finding that the medial TPR region (TPRs 6-8) contains features that are essential for the observed phenotypes. Taken together, this work demonstrates methods that can be used to further probe OGT's functions, and insights by which new understanding of OGT's protein-protein interactions can be derived.
일반주제명  
Biochemistry
일반주제명  
Cellular biology
일반주제명  
Biophysics
키워드  
Cryo-electron microscopy
키워드  
Protein inhibition
키워드  
Protein-protein interactions
키워드  
Mammalian enzyme
키워드  
Phenotypes
기타저자  
Harvard University Chemical Biology
기본자료저록  
Dissertations Abstracts International. 86-12B.
전자적 위치 및 접속  
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■1001  ▼aHammel,  Forrest  A.▼0(orcid)0000-0003-0613-5283
■24510▼aBiochemical  Characterization  of  Interactions  Between  O-GlcNac  Transferase  and  Its  Protein  Binding  Partners
■260    ▼a[Sl]▼bHarvard  University▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a225  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-12,  Section:  B.
■500    ▼aAdvisor:  Walker,  Suzanne.
■5021  ▼aThesis  (Ph.D.)--Harvard  University,  2025.
■520    ▼aO-GlcNAc  transferase  (OGT)  is  an  essential  mammalian  enzyme  that  is  solely  responsible  for  the  post-translational  modification  of  O-GlcNAcylation,  the  addition  of  N-acetyl-D-glucosamine  (GlcNAc)  onto  serine  and  threonine  sidechains  on  thousands  of  proteins  in  the  nucleus  and  cytoplasm.  OGT  catalyzes  another  post-translational  modification:  the  cleavage  of  host  cell  factor  1  (HCF-1),  which  it  does  via  O-GlcNAcylation  of  a  glutamate  residue  in  one  of  six  highly  conserved  proteolytic  repeats.  OGT  also  engages  in  a  wide  variety  of  protein  complexes,  facilitated  primarily  by  its  superhelical  tetratricopeptide  repeat  (TPR)  domain.  Previous  work  from  the  lab  has  demonstrated  that  OGT's  O-GlcNAcylation  and  noncatalytic  scaffolding  functions  are  essential  for  cellular  proliferation.In  this  thesis,  I  build  on  previous  notions  of  interactions  between  OGT  and  both  its  protein  substrates  and  non-substrate  interactors,  defining  features  that  drive  these  essential  functions.  Chapter  2  details  a  series  of  work  performed  in  collaboration  with  other  members  of  the  Walker  lab,  studying  the  effects  of  mutations  and  truncations  within  the  TPR  domain  on  OGT's  functions  and  its  ability  to  support  cell  proliferation;  we  show  that  truncation  of  OGT's  N-terminal  TPRs  impacts  viability  and  all  three  functions,  while  preventing  OGT  homodimerization  leads  to  increased  cell  growth.  Additionally,  in  that  chapter,  I  show  that  changes  to  protein-interacting  features  in  the  TPR  lumen  do  not  impact  all  of  OGT's  substrates  equally.  In  Chapter  3,  I  harness  TR-FRET  technology  to  develop  a  quantitative  binding  assay  for  OGT-substrate  interactions.  Using  that  assay,  I  identify  a  polypeptide  derived  from  HCF-1's  proteolytic  repeats,  HCF3R,  that  has  picomolar  affinity  and  inhibits  OGT  in  vitro  and  in  cells.  I  then  modify  this  probe  to  create  a  cellular  OGT  inhibitor  that  can  be  switched  on  and  off  by  addition  of  two  small  molecules.  In  Chapter  4,  I  use  a  combination  of  biochemical  and  structural  tools  to  interrogate  the  nature  of  the  OGT-HCF3R  interaction,  finding  that  the  medial  TPR  region  (TPRs  6-8)  contains  features  that  are  essential  for  the  observed  phenotypes.  Taken  together,  this  work  demonstrates  methods  that  can  be  used  to  further  probe  OGT's  functions,  and  insights  by  which  new  understanding  of  OGT's  protein-protein  interactions  can  be  derived.
■590    ▼aSchool  code:  0084.
■650  4▼aBiochemistry
■650  4▼aCellular  biology
■650  4▼aBiophysics
■653    ▼aCryo-electron  microscopy
■653    ▼aProtein  inhibition
■653    ▼aProtein-protein  interactions
■653    ▼aMammalian  enzyme
■653    ▼aPhenotypes
■690    ▼a0487
■690    ▼a0379
■690    ▼a0786
■71020▼aHarvard  University▼bChemical  Biology.
■7730  ▼tDissertations  Abstracts  International▼g86-12B.
■790    ▼a0084
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17356660▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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