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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 Evasion
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211151455
- ISBN
- 9798382776668
- DDC
- 576.6
- 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
- Immunity
- 키워드
- Signaling
- 키워드
- Viruses
- 기타저자
- Harvard University Biology Molecular and Cellular
- 기본자료저록
- Dissertations Abstracts International. 85-12B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798382776668
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■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a576.6
■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.


