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Early-Stage Assembly Landscape for the Large Subunit of the Bacterial Ribosome
Early-Stage Assembly Landscape for the Large Subunit of the Bacterial Ribosome
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211151945
- ISBN
- 9798383164310
- DDC
- 574
- 저자명
- Sheng, Kai.
- 서명/저자
- Early-Stage Assembly Landscape for the Large Subunit of the Bacterial Ribosome
- 발행사항
- [Sl] : The Scripps Research Institute, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 297 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
- 주기사항
- Advisor: Williamson, James R.
- 학위논문주기
- Thesis (Ph.D.)--The Scripps Research Institute, 2024.
- 초록/해제
- 요약Ribosomes play a crucial role in protein translation, and their assembly is both intricate and rapid within cells. For E. coli, it takes approximately two minutes to produce a functional ribosome from scratch. Investigating the complex and rapid folding mechanism of large RNA-protein complexes, such as the ribosome, remains a formidable challenge in structural biology.In Chapter 2, a streamlined pipeline was developed for solving ribosomal large subunit (LSU) assembly intermediates in genetically manipulated strains, such as those depleted of ribosomal proteins and assembly factors. This pipeline, including heterogeneous reconstruction methods, cooperativity assembly block identification, construction of networks between assembly blocks, and delineation of putative assembly pathways, was applied to three datasets: ∆deaD, ∆srmB, and a bL17-depletion strain. This novel approach facilitated the robust discovery of the smallest assembly core containing only 600 nucleotides and four ribosomal proteins, as well as the assembly pathway for early events in LSU solvent-side maturation at the early stage.Chapter 3 utilized this pipeline to discover 14 distinct LSU intermediates ranging from early to late stages in wild-type E. coli grown at 12 ˚C, providing insights into detailed assembly dependencies, including the formation of the central protuberance, stalks, and peptidyl transferase center. Additionally, the serendipitous trapping of an early intermediate by a pseudouridine synthase provided novel insights into early-stage assembly factor binding and substrate recognition.In Chapter 4, specific anti-sense oligonucleotides (ASOs) and their analogs were employed to disrupt native interactions of bacterial ribosomal RNA, capturing assembly intermediates in a near-physiological in vitro reconstitution platform. A screen identified 10 peptide nucleic acid (PNA) hits, with 6 progressing to structure characterization. This effort led to the discovery of 37 structures never reported before, revealing the smallest consensus core comprising 9 helices and 2 proteins. Notably, a major conformational rearrangement for domain III and VI rRNA was observed in a PNA-inhibited library, indicating that intra-domain folding can precede inter-domain docking in LSU assembly. Moreover, this approach further dissected the LSU into 158 structural smaller segments, enabling detailed assembly at single helix resolution, following a template-directed RNA foldon docking mechanism.Subsequently, Chapter 5 established a high-throughput dCas13/sgRNA two-plasmid system for in vivo rRNA targeting. The screening resulted in potential competitors in rRNA folding within the cellular environment. Two of the hits were cloned out and the disruption of LSU assembly has been verified by Cryo-EM single particle analysis. The platform also eluded possible assembly mechanisms in wild type and assembly factor deletion strains.In summary, this thesis successfully streamlined the generation of bacterial LSU assembly intermediates by various perturbations, solved heterogeneous assembly structures using Cryo-EM single particle analysis, and performed dependency and pathway analysis, thereby unveiling a landscape for bacterial LSU assembly.
- 일반주제명
- Biology
- 일반주제명
- Biochemistry
- 일반주제명
- Biophysics
- 키워드
- Ribosome
- 키워드
- Nucleotides
- 기타저자
- The Scripps Research Institute Structural Biology/Biophysics
- 기본자료저록
- Dissertations Abstracts International. 85-12B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211151945
■006m o d
■007cr#unu||||||||
■020 ▼a9798383164310
■035 ▼a(MiAaPQ)AAI31327714
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a574
■1001 ▼aSheng, Kai.
■24510▼aEarly-Stage Assembly Landscape for the Large Subunit of the Bacterial Ribosome
■260 ▼a[Sl]▼bThe Scripps Research Institute▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a297 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-12, Section: B.
■500 ▼aAdvisor: Williamson, James R.
■5021 ▼aThesis (Ph.D.)--The Scripps Research Institute, 2024.
■520 ▼aRibosomes play a crucial role in protein translation, and their assembly is both intricate and rapid within cells. For E. coli, it takes approximately two minutes to produce a functional ribosome from scratch. Investigating the complex and rapid folding mechanism of large RNA-protein complexes, such as the ribosome, remains a formidable challenge in structural biology.In Chapter 2, a streamlined pipeline was developed for solving ribosomal large subunit (LSU) assembly intermediates in genetically manipulated strains, such as those depleted of ribosomal proteins and assembly factors. This pipeline, including heterogeneous reconstruction methods, cooperativity assembly block identification, construction of networks between assembly blocks, and delineation of putative assembly pathways, was applied to three datasets: ∆deaD, ∆srmB, and a bL17-depletion strain. This novel approach facilitated the robust discovery of the smallest assembly core containing only 600 nucleotides and four ribosomal proteins, as well as the assembly pathway for early events in LSU solvent-side maturation at the early stage.Chapter 3 utilized this pipeline to discover 14 distinct LSU intermediates ranging from early to late stages in wild-type E. coli grown at 12 ˚C, providing insights into detailed assembly dependencies, including the formation of the central protuberance, stalks, and peptidyl transferase center. Additionally, the serendipitous trapping of an early intermediate by a pseudouridine synthase provided novel insights into early-stage assembly factor binding and substrate recognition.In Chapter 4, specific anti-sense oligonucleotides (ASOs) and their analogs were employed to disrupt native interactions of bacterial ribosomal RNA, capturing assembly intermediates in a near-physiological in vitro reconstitution platform. A screen identified 10 peptide nucleic acid (PNA) hits, with 6 progressing to structure characterization. This effort led to the discovery of 37 structures never reported before, revealing the smallest consensus core comprising 9 helices and 2 proteins. Notably, a major conformational rearrangement for domain III and VI rRNA was observed in a PNA-inhibited library, indicating that intra-domain folding can precede inter-domain docking in LSU assembly. Moreover, this approach further dissected the LSU into 158 structural smaller segments, enabling detailed assembly at single helix resolution, following a template-directed RNA foldon docking mechanism.Subsequently, Chapter 5 established a high-throughput dCas13/sgRNA two-plasmid system for in vivo rRNA targeting. The screening resulted in potential competitors in rRNA folding within the cellular environment. Two of the hits were cloned out and the disruption of LSU assembly has been verified by Cryo-EM single particle analysis. The platform also eluded possible assembly mechanisms in wild type and assembly factor deletion strains.In summary, this thesis successfully streamlined the generation of bacterial LSU assembly intermediates by various perturbations, solved heterogeneous assembly structures using Cryo-EM single particle analysis, and performed dependency and pathway analysis, thereby unveiling a landscape for bacterial LSU assembly.
■590 ▼aSchool code: 1179.
■650 4▼aBiology
■650 4▼aBiochemistry
■650 4▼aBiophysics
■653 ▼aRibosome
■653 ▼aNucleotides
■653 ▼aAnti-sense oligonucleotides
■653 ▼aCellular environment
■653 ▼aStructural biology
■690 ▼a0306
■690 ▼a0487
■690 ▼a0786
■71020▼aThe Scripps Research Institute▼bStructural Biology/Biophysics.
■7730 ▼tDissertations Abstracts International▼g85-12B.
■790 ▼a1179
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17162209▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


