서브메뉴
검색
Exploring the Activity of Peptide Agonists of Class B GPCRs With Sidechain Appendages
Exploring the Activity of Peptide Agonists of Class B GPCRs With Sidechain Appendages
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202103611
- ISBN
- 9798315733461
- DDC
- 540
- 서명/저자
- Exploring the Activity of Peptide Agonists of Class B GPCRs With Sidechain Appendages
- 발행사항
- [Sl] : The University of Wisconsin - Madison, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 633 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-11, Section: B.
- 주기사항
- Advisor: Gellman, Samuel H.
- 학위논문주기
- Thesis (Ph.D.)--The University of Wisconsin - Madison, 2025.
- 초록/해제
- 요약This thesis describes a series of class B GPCR peptide derivatives with sidechain appendages. I will refer to these molecules as "appendage peptides." One set of peptides had the appendage placed at position 17 in the GLP-1 sequence. The GLP-1 position 17 appendage peptides exhibited decreased maximal recruitment of β-arrestin 1, β-arrestin 2, and GRK2 to the receptor (GLP-1R), relative to the native hormone GLP-1. Despite these functional changes, the appendage peptides remained potent agonists, i.e., potent stimulators of intracellular production of the second messenger cAMP, which is mediated by the GS heterotrimer. The appendage peptides are partial agonists of the β-arrestin-mediated GPCR pathway and full agonists of the G protein-mediated pathway. Placing the same appendage at other positions in the GLP-1 sequence does not have the same effect. Another set of peptides shows that the appendage peptides are multi-receptor agonists of class B GPCRs. Each appendage peptide is a derivative of a natural peptide hormone with a non-canonical modification at one site. In the most interesting cases, the appendage allows the derivative to activate a GPCR that is not activated by the natural hormone. This new activity is weak (~1000-10,000-fold less potent than the GPCR's native agonist), but the peptide design represents a previously unknown method for creating multi-agonists. I show that GLP-1 derivatives can gain activity at the GIPR and GLP-2R, that GIP derivatives can gain activity at the GLP-1R, GCGR, and GLP-2R, and that GCG derivatives can gain activity at the GIPR (GCG is a dual agonist of the GLP-1R and GCGR). We hypothesize that the appendage peptides take advantage of previously unknown binding sites in GPCRs. We hypothesize that the GPCR binding sites contain a set of specific residues with which an appendage can have optimal binding interactions. These proposed sites lie just beyond proteinogenic amino acid sidechain reach and may exist in other unexamined class B GPCRs. Discovering new binding sites in class B GPCRs may lead to more opportunities for exploring class B GPCR peptide agonist activity.
- 일반주제명
- Chemistry
- 일반주제명
- Biochemistry
- 일반주제명
- Organic chemistry
- 키워드
- Agonist
- 키워드
- Allosteric
- 키워드
- Bitopic ligands
- 키워드
- Peptide
- 기타저자
- The University of Wisconsin - Madison Chemistry
- 기본자료저록
- Dissertations Abstracts International. 86-11B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008260126s2025 us c eng d■001000017357869
■00520260202103611
■006m o d
■007cr#unu||||||||
■020 ▼a9798315733461
■035 ▼a(MiAaPQ)AAI32043343
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a540
■1001 ▼aMorris, Rylie Kathleen.
■24510▼aExploring the Activity of Peptide Agonists of Class B GPCRs With Sidechain Appendages
■260 ▼a[Sl]▼bThe University of Wisconsin - Madison▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a633 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-11, Section: B.
■500 ▼aAdvisor: Gellman, Samuel H.
■5021 ▼aThesis (Ph.D.)--The University of Wisconsin - Madison, 2025.
■520 ▼aThis thesis describes a series of class B GPCR peptide derivatives with sidechain appendages. I will refer to these molecules as "appendage peptides." One set of peptides had the appendage placed at position 17 in the GLP-1 sequence. The GLP-1 position 17 appendage peptides exhibited decreased maximal recruitment of β-arrestin 1, β-arrestin 2, and GRK2 to the receptor (GLP-1R), relative to the native hormone GLP-1. Despite these functional changes, the appendage peptides remained potent agonists, i.e., potent stimulators of intracellular production of the second messenger cAMP, which is mediated by the GS heterotrimer. The appendage peptides are partial agonists of the β-arrestin-mediated GPCR pathway and full agonists of the G protein-mediated pathway. Placing the same appendage at other positions in the GLP-1 sequence does not have the same effect. Another set of peptides shows that the appendage peptides are multi-receptor agonists of class B GPCRs. Each appendage peptide is a derivative of a natural peptide hormone with a non-canonical modification at one site. In the most interesting cases, the appendage allows the derivative to activate a GPCR that is not activated by the natural hormone. This new activity is weak (~1000-10,000-fold less potent than the GPCR's native agonist), but the peptide design represents a previously unknown method for creating multi-agonists. I show that GLP-1 derivatives can gain activity at the GIPR and GLP-2R, that GIP derivatives can gain activity at the GLP-1R, GCGR, and GLP-2R, and that GCG derivatives can gain activity at the GIPR (GCG is a dual agonist of the GLP-1R and GCGR). We hypothesize that the appendage peptides take advantage of previously unknown binding sites in GPCRs. We hypothesize that the GPCR binding sites contain a set of specific residues with which an appendage can have optimal binding interactions. These proposed sites lie just beyond proteinogenic amino acid sidechain reach and may exist in other unexamined class B GPCRs. Discovering new binding sites in class B GPCRs may lead to more opportunities for exploring class B GPCR peptide agonist activity.
■590 ▼aSchool code: 0262.
■650 4▼aChemistry
■650 4▼aBiochemistry
■650 4▼aOrganic chemistry
■653 ▼aAgonist
■653 ▼aAllosteric
■653 ▼aBitopic ligands
■653 ▼aOrthosteric binding
■653 ▼aPeptide
■690 ▼a0485
■690 ▼a0487
■690 ▼a0490
■71020▼aThe University of Wisconsin - Madison▼bChemistry.
■7730 ▼tDissertations Abstracts International▼g86-11B.
■790 ▼a0262
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17357869▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


