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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 Binding Partners
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202103012
- ISBN
- 9798280720770
- DDC
- 574
- 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
- Mammalian enzyme
- 키워드
- Phenotypes
- 기타저자
- Harvard University Chemical Biology
- 기본자료저록
- Dissertations Abstracts International. 86-12B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202103012
■006m o d
■007cr#unu||||||||
■020 ▼a9798280720770
■035 ▼a(MiAaPQ)AAI31842791
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a574
■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.


