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Elucidating the Subcellular Organization of Endogenous G Protein Activation by GPCRs
Elucidating the Subcellular Organization of Endogenous G Protein Activation by GPCRs
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202103203
- ISBN
- 9798280748453
- DDC
- 574
- 서명/저자
- Elucidating the Subcellular Organization of Endogenous G Protein Activation by GPCRs
- 발행사항
- [Sl] : University of California, San Francisco, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 145 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
- 주기사항
- Includes supplementary digital materials.
- 주기사항
- Advisor: von Zastrow, Mark;Jura, Natalia.
- 학위논문주기
- Thesis (Ph.D.)--University of California, San Francisco, 2025.
- 초록/해제
- 요약Many GPCRs are now recognized to trigger a second phase of G protein signaling from endosomes. The presence of activated GPCRs on endosomes has been clearly shown, especially among Gs-coupled GPCRs, but endosomal signaling ultimately requires activation of the G protein, which mediates downstream signal transduction. How GPCRs regulate both G protein abundance and G protein activation on endosomes is incompletely understood. In this dissertation, I address this question by dissecting the regulation of GPCR-triggered G protein localization to and activation on endosomes. I first verify that activation of a model GPCR, the β2AR, at the plasma membrane drives translocation of Gαs to endosomes separately from trafficking of the activated receptor. Focusing on VIPR1, a GPCR that produces a well-resolved endosomal signal, I demonstrate the presence of active-state, endogenous Gαs at both the plasma membrane and endosomes, and I show that Gαs activation on endosomes is dependent on receptor endocytosis. I also detect VIPR1-mediated stimulation of an additional component of endogenous G protein activity, which I ascribe to Gαq/11, consistent with the known dual-coupling ability of VIPR1. Interestingly, VIPR1 preferentially activates Gαq/11 on the plasma membrane but Gαs on endosomes, and I further show location-specific preferences in Gαs and Gαq/11 activation by a second GPCR, the A2BR. Next, I investigate the mechanisms of reversible Gαs redistribution to endosomes. I confirm that Gαs dissociates from the plasma membrane after GPCR activation, samples endosomes and additional internal compartments, and returns to the plasma membrane after GPCR inactivation through a non-vesicular pathway. My results provide critical insights into the subcellular organization of G protein activation. Additionally, they uncover a new layer of location bias in cellular GPCR signaling, defined by changes in GPCR-G protein coupling at different subcellular locations.
- 일반주제명
- Biology
- 일반주제명
- Cellular biology
- 일반주제명
- Molecular biology
- 일반주제명
- Biochemistry
- 키워드
- GPCR signaling
- 키워드
- Subcellular
- 기타저자
- University of California, San Francisco Biochemistry and Molecular Biology
- 기본자료저록
- Dissertations Abstracts International. 86-12B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202103203
■006m o d
■007cr#unu||||||||
■020 ▼a9798280748453
■035 ▼a(MiAaPQ)AAI31999379
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a574
■1001 ▼aWysolmerski, Brian.▼0(orcid)0000-0002-4042-8269
■24510▼aElucidating the Subcellular Organization of Endogenous G Protein Activation by GPCRs
■260 ▼a[Sl]▼bUniversity of California, San Francisco▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a145 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-12, Section: B.
■500 ▼aIncludes supplementary digital materials.
■500 ▼aAdvisor: von Zastrow, Mark;Jura, Natalia.
■5021 ▼aThesis (Ph.D.)--University of California, San Francisco, 2025.
■520 ▼aMany GPCRs are now recognized to trigger a second phase of G protein signaling from endosomes. The presence of activated GPCRs on endosomes has been clearly shown, especially among Gs-coupled GPCRs, but endosomal signaling ultimately requires activation of the G protein, which mediates downstream signal transduction. How GPCRs regulate both G protein abundance and G protein activation on endosomes is incompletely understood. In this dissertation, I address this question by dissecting the regulation of GPCR-triggered G protein localization to and activation on endosomes. I first verify that activation of a model GPCR, the β2AR, at the plasma membrane drives translocation of Gαs to endosomes separately from trafficking of the activated receptor. Focusing on VIPR1, a GPCR that produces a well-resolved endosomal signal, I demonstrate the presence of active-state, endogenous Gαs at both the plasma membrane and endosomes, and I show that Gαs activation on endosomes is dependent on receptor endocytosis. I also detect VIPR1-mediated stimulation of an additional component of endogenous G protein activity, which I ascribe to Gαq/11, consistent with the known dual-coupling ability of VIPR1. Interestingly, VIPR1 preferentially activates Gαq/11 on the plasma membrane but Gαs on endosomes, and I further show location-specific preferences in Gαs and Gαq/11 activation by a second GPCR, the A2BR. Next, I investigate the mechanisms of reversible Gαs redistribution to endosomes. I confirm that Gαs dissociates from the plasma membrane after GPCR activation, samples endosomes and additional internal compartments, and returns to the plasma membrane after GPCR inactivation through a non-vesicular pathway. My results provide critical insights into the subcellular organization of G protein activation. Additionally, they uncover a new layer of location bias in cellular GPCR signaling, defined by changes in GPCR-G protein coupling at different subcellular locations.
■590 ▼aSchool code: 0034.
■650 4▼aBiology
■650 4▼aCellular biology
■650 4▼aMolecular biology
■650 4▼aBiochemistry
■653 ▼aEndosomal signaling
■653 ▼aG protein trafficking
■653 ▼aGPCR signaling
■653 ▼aGs-cAMP signaling
■653 ▼aSubcellular
■690 ▼a0306
■690 ▼a0379
■690 ▼a0307
■690 ▼a0487
■71020▼aUniversity of California, San Francisco▼bBiochemistry and Molecular Biology.
■7730 ▼tDissertations Abstracts International▼g86-12B.
■790 ▼a0034
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17357292▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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