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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
Exploring the Activity of Peptide Agonists of Class B GPCRs With Sidechain Appendages

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202103611
ISBN  
9798315733461
DDC  
540
저자명  
Morris, Rylie Kathleen.
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  
Orthosteric binding
키워드  
Peptide
기타저자  
The University of Wisconsin - Madison Chemistry
기본자료저록  
Dissertations Abstracts International. 86-11B.
전자적 위치 및 접속  
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MARC

 008260126s2025        us                              c    eng  d
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■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.

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