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Lipopeptidomimetics Are Selective and Modifiable Coactivator Protein-Protein Interaction Inhibitors
Lipopeptidomimetics Are Selective and Modifiable Coactivator Protein-Protein Interaction Inhibitors
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211152107
- ISBN
- 9798382741154
- DDC
- 574
- 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
- Inhibitor design
- 키워드
- Chemical biology
- 키워드
- Selectivity
- 기타저자
- University of Michigan Chemical Biology
- 기본자료저록
- Dissertations Abstracts International. 85-12B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211152107
■006m o d
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■020 ▼a9798382741154
■035 ▼a(MiAaPQ)AAI31349135
■035 ▼a(MiAaPQ)umichrackham005408
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a574
■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.


