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Understanding the Mechanism of Bacterial cGas Immunity and Its Co-Evolution With Phage
Understanding the Mechanism of Bacterial cGas Immunity and Its Co-Evolution With Phage
Understanding the Mechanism of Bacterial cGas Immunity and Its Co-Evolution With Phage

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211151318
ISBN  
9798382815787
DDC  
576
저자명  
Huiting, Erin.
서명/저자  
Understanding the Mechanism of Bacterial cGas Immunity and Its Co-Evolution With Phage
발행사항  
[Sl] : University of California, San Francisco, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
147 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
주기사항  
Advisor: Sil, Anita.
학위논문주기  
Thesis (Ph.D.)--University of California, San Francisco, 2024.
초록/해제  
요약A fundamental strategy of eukaryotic anti-viral innate immunity involves the cGAS enzyme, which synthesizes 2',3'-cGAMP and activates a STING effector to limit viral replication. Bacteria contain cGAS-like enzymes producing a diversity of cyclic oligonucleotide signals that activate an effector protein to induce cell death upon bacteriophage (phage) infection, known as CBASS. It remains unknown whether bacteria endogenously expressing CBASS exerts anti-phage activity and how these bacteria and phage co-evolve together. Here, we identified endogenously active Type II-A CBASS in Pseudomonas aeruginosa that contains a cGAS-like enzyme (CdnA) producing 3',3'-cGAMP, which signals to a phospholipase (CapV) effector and limits dsDNA lytic and temperate phage replication 10,000-fold. In response, phages evolved an anti-CBASS protein (Acb2) that forms a hexamer with three cGAMP molecules to 'sponge' up signals and effectively inhibit both bacterial CapV and eukaryotic STING effector activity. Excitingly, Acb2 binds to an even broader spectrum of CBASS cyclic dinucleotides (CDNs), like 3',3'-cUU/UA/UG, and cyclic trinucleotides (CTNs), like 3',3',3'-cAAA/cAAG. One Acb2 hexamer can independently and simultaneously bind three CDNs and two CTNs, enabling phages to inhibit bacteria with Type II-A (3',3'c-cGAMP-producing) and Type III-C (cA3-producing) CBASS. These collective findings establish a new paradigm of viral proteins that sponge a remarkable breath of cyclic oligonucleotide molecules and inhibit signaling-based immunity across all domains of life. Upon deletion of Acb2, phage mutants selected under CBASS immune pressure were forced to evolve mutations in their major capsid protein to escape. While there is growing evidence of phages mutating essential structural proteins to escape CBASS, the reason for evasion remains unclear. Despite this, to counteract CBASS resistant phages, we observed that increasing CdnA enzymatic activity and 3',3'-cGAMP production vastly increases CBASS anti-phage activity and overcomes phages expressing Acb2 or mutant capsids. Surprisingly, counter to the established dogma that CBASS induces cell death, the hyperactive and endogenously active Type II-A CBASS in P. aeruginosa induces cell growth and protects bacteria from phage-induced lysis. Altogether, these findings demonstrate that native bacterial hosts exert CBASS immunity and that phages can evolve and counteract this immune response through potent inhibitors that 'sponge' CBASS signaling molecules or acquisition of mutations in structural proteins.
일반주제명  
Microbiology
일반주제명  
Virology
일반주제명  
Immunology
일반주제명  
Cellular biology
일반주제명  
Biochemistry
키워드  
Innate immunity
키워드  
Phages
키워드  
Pseudomonas aeruginosa
키워드  
Immune systems
키워드  
Signaling molecules
기타저자  
University of California, San Francisco Biomedical Sciences
기본자료저록  
Dissertations Abstracts International. 85-12B.
전자적 위치 및 접속  
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MARC

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■035    ▼a(MiAaPQ)AAI31238817
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■0820  ▼a576
■1001  ▼aHuiting,  Erin.▼0(orcid)0000-0002-5454-2679
■24510▼aUnderstanding  the  Mechanism  of  Bacterial  cGas  Immunity  and  Its  Co-Evolution  With  Phage
■260    ▼a[Sl]▼bUniversity  of  California,  San  Francisco▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a147  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-12,  Section:  B.
■500    ▼aAdvisor:  Sil,  Anita.
■5021  ▼aThesis  (Ph.D.)--University  of  California,  San  Francisco,  2024.
■520    ▼aA  fundamental  strategy  of  eukaryotic  anti-viral  innate  immunity  involves  the  cGAS  enzyme,  which  synthesizes  2',3'-cGAMP  and  activates  a  STING  effector  to  limit  viral  replication.  Bacteria  contain  cGAS-like  enzymes  producing  a  diversity  of  cyclic  oligonucleotide  signals  that  activate  an  effector  protein  to  induce  cell  death  upon  bacteriophage  (phage)  infection,  known  as  CBASS.  It  remains  unknown  whether  bacteria  endogenously  expressing  CBASS  exerts  anti-phage  activity  and  how  these  bacteria  and  phage  co-evolve  together.  Here,  we  identified  endogenously  active  Type  II-A  CBASS  in  Pseudomonas  aeruginosa  that  contains  a  cGAS-like  enzyme  (CdnA)  producing  3',3'-cGAMP,  which  signals  to  a  phospholipase  (CapV)  effector  and  limits  dsDNA  lytic  and  temperate  phage  replication  10,000-fold.  In  response,  phages  evolved  an  anti-CBASS  protein  (Acb2)  that  forms  a  hexamer  with  three  cGAMP  molecules  to  'sponge'  up  signals  and  effectively  inhibit  both  bacterial  CapV  and  eukaryotic  STING  effector  activity.  Excitingly,  Acb2  binds  to  an  even  broader  spectrum  of  CBASS  cyclic  dinucleotides  (CDNs),  like  3',3'-cUU/UA/UG,  and  cyclic  trinucleotides  (CTNs),  like  3',3',3'-cAAA/cAAG.  One  Acb2  hexamer  can  independently  and  simultaneously  bind  three  CDNs  and  two  CTNs,  enabling  phages  to  inhibit  bacteria  with  Type  II-A  (3',3'c-cGAMP-producing)  and  Type  III-C  (cA3-producing)  CBASS.  These  collective  findings  establish  a  new  paradigm  of  viral  proteins  that  sponge  a  remarkable  breath  of  cyclic  oligonucleotide  molecules  and  inhibit  signaling-based  immunity  across  all  domains  of  life.  Upon  deletion  of  Acb2,  phage  mutants  selected  under  CBASS  immune  pressure  were  forced  to  evolve  mutations  in  their  major  capsid  protein  to  escape.  While  there  is  growing  evidence  of  phages  mutating  essential  structural  proteins  to  escape  CBASS,  the  reason  for  evasion  remains  unclear.  Despite  this,  to  counteract  CBASS  resistant  phages,  we  observed  that  increasing  CdnA  enzymatic  activity  and  3',3'-cGAMP  production  vastly  increases  CBASS  anti-phage  activity  and  overcomes  phages  expressing  Acb2  or  mutant  capsids.  Surprisingly,  counter  to  the  established  dogma  that  CBASS  induces  cell  death,  the  hyperactive  and  endogenously  active  Type  II-A  CBASS  in  P.  aeruginosa  induces  cell  growth  and  protects  bacteria  from  phage-induced  lysis.  Altogether,  these  findings  demonstrate  that  native  bacterial  hosts  exert  CBASS  immunity  and  that  phages  can  evolve  and  counteract  this  immune  response  through  potent  inhibitors  that  'sponge'  CBASS  signaling  molecules  or  acquisition  of  mutations  in  structural  proteins.
■590    ▼aSchool  code:  0034.
■650  4▼aMicrobiology
■650  4▼aVirology
■650  4▼aImmunology
■650  4▼aCellular  biology
■650  4▼aBiochemistry
■653    ▼aInnate  immunity
■653    ▼aPhages
■653    ▼aPseudomonas  aeruginosa
■653    ▼aImmune  systems
■653    ▼aSignaling  molecules
■690    ▼a0410
■690    ▼a0720
■690    ▼a0982
■690    ▼a0379
■690    ▼a0487
■71020▼aUniversity  of  California,  San  Francisco▼bBiomedical  Sciences.
■7730  ▼tDissertations  Abstracts  International▼g85-12B.
■790    ▼a0034
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17161159▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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