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The Phage Prohead Protease Is a Key Determinant of Type I CBASS Immune Activation and Evasion
The Phage Prohead Protease Is a Key Determinant of Type I CBASS Immune Activation and Evas...
The Phage Prohead Protease Is a Key Determinant of Type I CBASS Immune Activation and Evasion

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자료유형  
 학위논문 서양
최종처리일시  
20250211151455
ISBN  
9798382776668
DDC  
576.6
저자명  
Richmond-Buccola, Desmond.
서명/저자  
The Phage Prohead Protease Is a Key Determinant of Type I CBASS Immune Activation and Evasion
발행사항  
[Sl] : Harvard University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
111 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
주기사항  
Advisor: Kranzusch, Philip J.
학위논문주기  
Thesis (Ph.D.)--Harvard University, 2024.
초록/해제  
요약Viruses must overcome a diverse array of host immune defenses to ensure successful replication and propagation. In bacteria, CBASS (cyclic oligonucleotide-based antiphage signaling system) immunity restricts phage replication via synthesis of cyclic nucleotide-based signals which amplify antiviral signaling and halt phage propagation via abortive infection. Structural and functional analysis of CBASS operons revealed evolutionary connections with the mammalian cGAS-STING innate immune pathway, demonstrating that nucleotide-based second messenger signaling is an ancient mechanism of host antiviral defense. In mammals, cGAS-STING signaling is initiated by recognition of viral dsDNA by cGAS (Cyclic GMP-AMP Synthase) and further studies have shown that additional cGAS-like receptors (cGLRs) are also stimulated by double-stranded nucleic acid ligands. In contrast, the molecular cues which initiate antiviral signaling in bacterial CBASS immunity remain incompletely understood. We conduct a large-scale screen of 975 Type I CBASS operon-phage challenges and show that operons with distinct CD-NTases (cGAS/DncV-like NTase) and Cap (CD-NTase-associated protein) effectors exhibit marked patterns of phage restriction. We functionally characterize the CBASS-associated AGS-C immunoglobulin-like fold domain and find that it is required for defense against select phages and use X-ray crystallography to determine the 1.7 A structure of an AGS-C domain. Escaper phages evade CBASS immunity via coding mutations in virion assembly proteins and we demonstrate that the phage Bas13 prohead protease protein interacts with the CD-NTase EcCdnD12 in cells and is sufficient to induce CBASS-dependent growth arrest in a two-plasmid system, defining phage virion assembly as a determinant of Type I CBASS immunity and demonstrating viral protein recognition as a novel putative mechanism of cGAS-like enzyme activation. To further study regulation of human cGAS-STING immunity, we determined a series of crystal structures of human-mouse chimeric TREX1 (Three prime repair exonuclease 1) proteins, a key negative regulator of cGAS, and identify human TREX1 residues critical for crystallization. We also solve the crystal structures of a 99% human TREX1 chimera and fully WT human dsDNA-bound TREX1 and perform biochemical experiments on TREX1 autoimmune disease-associated mutant proteins.
일반주제명  
Virology
일반주제명  
Microbiology
일반주제명  
Biochemistry
일반주제명  
Immunology
키워드  
Antiphage defense
키워드  
Immunity
키워드  
Signaling
키워드  
Viruses
키워드  
Autoimmune disease
기타저자  
Harvard University Biology Molecular and Cellular
기본자료저록  
Dissertations Abstracts International. 85-12B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aRichmond-Buccola,  Desmond.▼0(orcid)0000-0001-5574-1891
■24510▼aThe  Phage  Prohead  Protease  Is  a  Key  Determinant  of  Type  I  CBASS  Immune  Activation  and  Evasion
■260    ▼a[Sl]▼bHarvard  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a111  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-12,  Section:  B.
■500    ▼aAdvisor:  Kranzusch,  Philip  J.
■5021  ▼aThesis  (Ph.D.)--Harvard  University,  2024.
■520    ▼aViruses  must  overcome  a  diverse  array  of  host  immune  defenses  to  ensure  successful  replication  and  propagation.  In  bacteria,  CBASS  (cyclic  oligonucleotide-based  antiphage  signaling  system)  immunity  restricts  phage  replication  via  synthesis  of  cyclic  nucleotide-based  signals  which  amplify  antiviral  signaling  and  halt  phage  propagation  via  abortive  infection.  Structural  and  functional  analysis  of  CBASS  operons  revealed  evolutionary  connections  with  the  mammalian  cGAS-STING  innate  immune  pathway,  demonstrating  that  nucleotide-based  second  messenger  signaling  is  an  ancient  mechanism  of  host  antiviral  defense.  In  mammals,  cGAS-STING  signaling  is  initiated  by  recognition  of  viral  dsDNA  by  cGAS  (Cyclic  GMP-AMP  Synthase)  and  further  studies  have  shown  that  additional  cGAS-like  receptors  (cGLRs)  are  also  stimulated  by  double-stranded  nucleic  acid  ligands.  In  contrast,  the  molecular  cues  which  initiate  antiviral  signaling  in  bacterial  CBASS  immunity  remain  incompletely  understood.  We  conduct  a  large-scale  screen  of  975  Type  I  CBASS  operon-phage  challenges  and  show  that  operons  with  distinct  CD-NTases  (cGAS/DncV-like  NTase)  and  Cap  (CD-NTase-associated  protein)  effectors  exhibit  marked  patterns  of  phage  restriction.  We  functionally  characterize  the  CBASS-associated  AGS-C  immunoglobulin-like  fold  domain  and  find  that  it  is  required  for  defense  against  select  phages  and  use  X-ray  crystallography  to  determine  the  1.7  A  structure  of  an  AGS-C  domain.  Escaper  phages  evade  CBASS  immunity  via  coding  mutations  in  virion  assembly  proteins  and  we  demonstrate  that  the  phage  Bas13  prohead  protease  protein  interacts  with  the  CD-NTase  EcCdnD12  in  cells  and  is  sufficient  to  induce  CBASS-dependent  growth  arrest  in  a  two-plasmid  system,  defining  phage  virion  assembly  as  a  determinant  of  Type  I  CBASS  immunity  and  demonstrating  viral  protein  recognition  as  a  novel  putative  mechanism  of  cGAS-like  enzyme  activation.  To  further  study  regulation  of  human  cGAS-STING  immunity,  we  determined  a  series  of  crystal  structures  of  human-mouse  chimeric  TREX1  (Three  prime  repair  exonuclease  1)  proteins,  a  key  negative  regulator  of  cGAS,  and  identify  human  TREX1  residues  critical  for  crystallization.  We  also  solve  the  crystal  structures  of  a  99%  human  TREX1  chimera  and  fully  WT  human  dsDNA-bound  TREX1  and  perform  biochemical  experiments  on  TREX1  autoimmune  disease-associated  mutant  proteins.
■590    ▼aSchool  code:  0084.
■650  4▼aVirology
■650  4▼aMicrobiology
■650  4▼aBiochemistry
■650  4▼aImmunology
■653    ▼aAntiphage  defense
■653    ▼aImmunity
■653    ▼aSignaling
■653    ▼aViruses
■653    ▼aAutoimmune  disease
■690    ▼a0720
■690    ▼a0410
■690    ▼a0487
■690    ▼a0982
■71020▼aHarvard  University▼bBiology,  Molecular  and  Cellular.
■7730  ▼tDissertations  Abstracts  International▼g85-12B.
■790    ▼a0084
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17161867▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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