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Lipopeptidomimetics Are Selective and Modifiable Coactivator Protein-Protein Interaction Inhibitors
Lipopeptidomimetics Are Selective and Modifiable Coactivator Protein-Protein Interaction I...
Lipopeptidomimetics Are Selective and Modifiable Coactivator Protein-Protein Interaction Inhibitors

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211152107
ISBN  
9798382741154
DDC  
574
저자명  
Martinez Valdivia, Estefania.
서명/저자  
Lipopeptidomimetics Are Selective and Modifiable Coactivator Protein-Protein Interaction Inhibitors
발행사항  
[Sl] : University of Michigan, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
236 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
주기사항  
Advisor: Mapp, Anna K.
학위논문주기  
Thesis (Ph.D.)--University of Michigan, 2024.
초록/해제  
요약The protein-protein interactions (PPIs) of transcriptional coactivators are key to the synergistic activation of gene expression. The dysregulation of these PPI networks, particularly in the interactions between coactivator and activator proteins, is present in several forms of disease. Inhibition of coactivator PPIs is thereby a strategy to dissect the functional role of the interactions between transcriptional components in dysregulated contexts. Coactivator PPIs occur through intricate mechanisms of recognition, which involve dynamic complex formation, an undefined surface topology, and multiple binding partners. The functional disruption of these interactions with synthetic molecules has historically been challenging, considering that these factors limit the structural information available for developing inhibitors using rational-design or structure-based approaches. Here we propose that short peptides derived from the sequences within the interaction surfaces of coactivator-activator PPIs, have the potential to be developed into potent and selective inhibitors of these complexes. We demonstrate that peptide lipidation is a powerful form of modification to enhance the inhibitory activity of short activator-like peptides against coactivator complexes. This dissertation presents the development and evaluation of lipopeptidomimetics (LPPMs) as inhibitors of the PPIs of coactivators. In our initial assessment of this strategy, we used a peptide with an amino acid sequence that shares characteristics with the composition of transcriptional activation domains (TAD) of activators, against the PPIs of coactivator Med25. This protein, a subunit of Mediator, regulates the expression of genes implicated in various types of cancer. We demonstrate that the incorporation of a medium-chain, branched fatty acid to a heptameric peptide, LPPM-8, increases the compound's inhibitory activity by over 20-fold, rendering it a selective inhibitor of Med25 PPIs. Structure-activity relationship studies, combined with biophysical analyses, revealed that the lipid structure, specific amino acid residues, and the C-terminal moiety of the molecule each contribute to LPPM-8's effectiveness and the structural propensity as an inhibitor. We determined that this molecule acts primarily as an orthosteric inhibitor of Med25 PPIs, and we observed its biological activity in a cellular context. Next, aiming to determine whether this strategy could be applied to multiple coactivator targets, we tested it against the PPIs of the KIX domain of coactivator CBP. We found that specific sequence modifications in LPPMs lead to altered selectivity for different coactivator targets. In particular, changing a single amino acid from aspartic acid to alanine (LPPM-8-D2A) resulted in a 10-fold selectivity switch towards the inhibition of CBP KIX compared to Med25 PPIs. This selectivity switch was validated by evaluating the LPPM-8-D2A multiple contexts, revealing its allosteric inhibition of KIX PPIs. These findings suggest that LPPMs are tunable scaffolds with potential as a generalizable strategy for inhibiting coactivator PPIs. Chapter 4 outlines the potential steps necessary to refine LPPM design into a high-throughput approach for the development of inhibitors and explores the application of this method to other coactivator and intrinsically disordered protein systems.
일반주제명  
Biochemistry
일반주제명  
Chemistry
일반주제명  
Cellular biology
일반주제명  
Molecular biology
키워드  
Protein-protein interaction(s)
키워드  
Transcriptional coactivator
키워드  
Inhibitor design
키워드  
Peptide lipidation
키워드  
Chemical biology
키워드  
Selectivity
기타저자  
University of Michigan Chemical Biology
기본자료저록  
Dissertations Abstracts International. 85-12B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aMartinez  Valdivia,  Estefania.
■24510▼aLipopeptidomimetics  Are  Selective  and  Modifiable  Coactivator  Protein-Protein  Interaction  Inhibitors
■260    ▼a[Sl]▼bUniversity  of  Michigan▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a236  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-12,  Section:  B.
■500    ▼aAdvisor:  Mapp,  Anna  K.
■5021  ▼aThesis  (Ph.D.)--University  of  Michigan,  2024.
■520    ▼aThe  protein-protein  interactions  (PPIs)  of  transcriptional  coactivators  are  key  to  the  synergistic  activation  of  gene  expression.  The  dysregulation  of  these  PPI  networks,  particularly  in  the  interactions  between  coactivator  and  activator  proteins,  is  present  in  several  forms  of  disease.  Inhibition  of  coactivator  PPIs  is  thereby  a  strategy  to  dissect  the  functional  role  of  the  interactions  between  transcriptional  components  in  dysregulated  contexts.  Coactivator  PPIs  occur  through  intricate  mechanisms  of  recognition,  which  involve  dynamic  complex  formation,  an  undefined  surface  topology,  and  multiple  binding  partners.  The  functional  disruption  of  these  interactions  with  synthetic  molecules  has  historically  been  challenging,  considering  that  these  factors  limit  the  structural  information  available  for  developing  inhibitors  using  rational-design  or  structure-based  approaches.  Here  we  propose  that  short  peptides  derived  from  the  sequences  within  the  interaction  surfaces  of  coactivator-activator  PPIs,  have  the  potential  to  be  developed  into  potent  and  selective  inhibitors  of  these  complexes.  We  demonstrate  that  peptide  lipidation  is  a  powerful  form  of  modification  to  enhance  the  inhibitory  activity  of  short  activator-like  peptides  against  coactivator  complexes.  This  dissertation  presents  the  development  and  evaluation  of  lipopeptidomimetics  (LPPMs)  as  inhibitors  of  the  PPIs  of  coactivators.  In  our  initial  assessment  of  this  strategy,  we  used  a  peptide  with  an  amino  acid  sequence  that  shares  characteristics  with  the  composition  of  transcriptional  activation  domains  (TAD)  of  activators,  against  the  PPIs  of  coactivator  Med25.  This  protein,  a  subunit  of  Mediator,  regulates  the  expression  of  genes  implicated  in  various  types  of  cancer.  We  demonstrate  that  the  incorporation  of  a  medium-chain,  branched  fatty  acid  to  a  heptameric  peptide,  LPPM-8,  increases  the  compound's  inhibitory  activity  by  over  20-fold,  rendering  it  a  selective  inhibitor  of  Med25  PPIs.  Structure-activity  relationship  studies,  combined  with  biophysical  analyses,  revealed  that  the  lipid  structure,  specific  amino  acid  residues,  and  the  C-terminal  moiety  of  the  molecule  each  contribute  to  LPPM-8's  effectiveness  and  the  structural  propensity  as  an  inhibitor.  We  determined  that  this  molecule  acts  primarily  as  an  orthosteric  inhibitor  of  Med25  PPIs,  and  we  observed  its  biological  activity  in  a  cellular  context.    Next,  aiming  to  determine  whether  this  strategy  could  be  applied  to  multiple  coactivator  targets,  we  tested  it  against  the  PPIs  of  the  KIX  domain  of  coactivator  CBP.  We  found  that  specific  sequence  modifications  in  LPPMs  lead  to  altered  selectivity  for  different  coactivator  targets.  In  particular,  changing  a  single  amino  acid  from  aspartic  acid  to  alanine  (LPPM-8-D2A)  resulted  in  a  10-fold  selectivity  switch  towards  the  inhibition  of  CBP  KIX  compared  to  Med25  PPIs.  This  selectivity  switch  was  validated  by  evaluating  the  LPPM-8-D2A  multiple  contexts,  revealing  its  allosteric  inhibition  of  KIX  PPIs.  These  findings  suggest  that  LPPMs  are  tunable  scaffolds  with  potential  as  a  generalizable  strategy  for  inhibiting  coactivator  PPIs.  Chapter  4  outlines  the  potential  steps  necessary  to  refine  LPPM  design  into  a  high-throughput  approach  for  the  development  of  inhibitors  and  explores  the  application  of  this  method  to  other  coactivator  and  intrinsically  disordered  protein  systems.
■590    ▼aSchool  code:  0127.
■650  4▼aBiochemistry
■650  4▼aChemistry
■650  4▼aCellular  biology
■650  4▼aMolecular  biology
■653    ▼aProtein-protein  interaction(s)
■653    ▼aTranscriptional  coactivator
■653    ▼aInhibitor  design
■653    ▼aPeptide  lipidation
■653    ▼aChemical  biology
■653    ▼aSelectivity
■690    ▼a0487
■690    ▼a0379
■690    ▼a0307
■690    ▼a0485
■71020▼aUniversity  of  Michigan▼bChemical  Biology.
■7730  ▼tDissertations  Abstracts  International▼g85-12B.
■790    ▼a0127
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17162878▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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