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Pch2 is a hexameric ring ATPase that remodels the meiotic chromosome axis protein Hop1- [electronic resource]
Pch2 is a hexameric ring ATPase that remodels the meiotic chromosome axis protein Hop1- [electronic resource]
상세정보
- 자료유형
- 학위논문(국외)
- 자관 청구기호
- 기본표목-개인명
- 표제와 책임표시사항
- Pch2 is a hexameric ring ATPase that remodels the meiotic chromosome axis protein Hop1 - [electronic resource] / Chen, Cheng.
- 발행, 배포, 간사 사항
- 발행, 배포, 간사 사항
- 형태사항
- 1 online resource(202 p)
- 일반주기
- Source: Dissertation Abstracts International, Volume: 75-10(E), Section: B.
- 일반주기
- Adviser: Eric Alani.
- 학위논문주기
- Thesis (Ph.D.)--Cornell University, 2014.
- 이용제한주기
- This item is not available from ProQuest Dissertations & Theses.
- 요약 등 주기
- 요약In most organisms, the accurate segregation of chromosomes during the first meiotic division requires at least one crossover between each pair of homologous chromosomes. Crossovers form in meiosis from programmed double-strand breaks (DSBs) that are preferentially repaired using the homologous chromosome as a template. The PCH2 gene of budding yeast is required to establish proper meiotic chromosome structure, and to regulate meiotic DSB repair outcomes. PCH2 was also found to promote meiotic checkpoint functions, and to maintain ribosomal DNA stability during meiosis. The major focus of my thesis research has been to elucidate the molecular mechanism of Pch2 function. Pch2 contains an AAA (A&barbelow;TPases A&barbelow;ssociated with diverse cellular A&barbelow;ctivities) domain and is conserved in worms, fruit flies, and mammals. I performed the first detailed biochemical analysis of Pch2, and found that purified Pch2 oligomerizes into single hexameric rings in the presence of nucleotide. In addition, I showed that Pch2 directly binds to Hop1, a critical component of the synaptonemal complex that facilitates DSB repair to form crossovers. Interestingly, Hop1 binding by Pch2 induces large conformational changes in Pch2 hexamers, suggesting that Pch2 hexamers exert mechanical forces on Hop1. Importantly, I demonstrate that Pch2 subunits coordinate their ATP hydrolysis activities to displace Hop1 from large DNA substrates, providing an explanation for the altered localization of Hop1 in pch2Delta mutants that was previously observed. Based on these results and other genetic and cell biological evidences I propose that Pch2 impacts multiple meiotic chromosome functions by directly regulating Hop1 localization.
- 요약 등 주기
- 요약The second part of my thesis involves analyzing the pro-crossover Msh4-Msh5 complex, which facilitates interhomolog crossover formation by stabilizing recombination intermediates. To analyze Msh4-Msh5 function, I assayed spore viability and crossover levels for 57 msh4 and msh5 mutants and identified threshold mutants that showed wild-type spore viability but significantly decreased crossover levels. These findings suggest that a buffering mechanism exists to ensure the obligate crossover when overall crossover levels are reduced.
- 주제명부출표목-일반주제명
- 주제명부출표목-일반주제명
- 주제명부출표목-일반주제명
- 부출표목-단체명
- 기본자료저록
- Dissertation Abstracts International. 75-10B(E).
- 기본자료저록
- Dissertation Abstract International
- 전자적 위치 및 접속
- 원문정보보기
- 소장사항
-
20180515 2018
MARC
008180601s2014 us esm 001c eng■001MOKWON01257748
■00520180518094448
■007cr
■020 ▼a9781321125993
■035 ▼a(MiAaPQ)AAI3583137
■040 ▼aMiAaPQ▼cMiAaPQ
■090 ▼a전자도서(박사논문)
■1001 ▼aChen, Cheng.
■24510▼aPch2 is a hexameric ring ATPase that remodels the meiotic chromosome axis protein Hop1▼h[electronic resource]▼cChen, Cheng.
■260 ▼a[Sl]▼bCornell University▼c2014
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2014
■300 ▼a1 online resource(202 p)
■500 ▼aSource: Dissertation Abstracts International, Volume: 75-10(E), Section: B.
■500 ▼aAdviser: Eric Alani.
■5021 ▼aThesis (Ph.D.)--Cornell University, 2014.
■506 ▼aThis item is not available from ProQuest Dissertations & Theses.
■520 ▼aIn most organisms, the accurate segregation of chromosomes during the first meiotic division requires at least one crossover between each pair of homologous chromosomes. Crossovers form in meiosis from programmed double-strand breaks (DSBs) that are preferentially repaired using the homologous chromosome as a template. The PCH2 gene of budding yeast is required to establish proper meiotic chromosome structure, and to regulate meiotic DSB repair outcomes. PCH2 was also found to promote meiotic checkpoint functions, and to maintain ribosomal DNA stability during meiosis. The major focus of my thesis research has been to elucidate the molecular mechanism of Pch2 function. Pch2 contains an AAA (A&barbelow;TPases A&barbelow;ssociated with diverse cellular A&barbelow;ctivities) domain and is conserved in worms, fruit flies, and mammals. I performed the first detailed biochemical analysis of Pch2, and found that purified Pch2 oligomerizes into single hexameric rings in the presence of nucleotide. In addition, I showed that Pch2 directly binds to Hop1, a critical component of the synaptonemal complex that facilitates DSB repair to form crossovers. Interestingly, Hop1 binding by Pch2 induces large conformational changes in Pch2 hexamers, suggesting that Pch2 hexamers exert mechanical forces on Hop1. Importantly, I demonstrate that Pch2 subunits coordinate their ATP hydrolysis activities to displace Hop1 from large DNA substrates, providing an explanation for the altered localization of Hop1 in pch2Delta mutants that was previously observed. Based on these results and other genetic and cell biological evidences I propose that Pch2 impacts multiple meiotic chromosome functions by directly regulating Hop1 localization.
■520 ▼aThe second part of my thesis involves analyzing the pro-crossover Msh4-Msh5 complex, which facilitates interhomolog crossover formation by stabilizing recombination intermediates. To analyze Msh4-Msh5 function, I assayed spore viability and crossover levels for 57 msh4 and msh5 mutants and identified threshold mutants that showed wild-type spore viability but significantly decreased crossover levels. These findings suggest that a buffering mechanism exists to ensure the obligate crossover when overall crossover levels are reduced.
■590 ▼aSchool code: 0058.
■650 4▼aBiochemistry
■650 4▼aMolecular biology
■650 4▼aGenetics
■690 ▼a0487
■690 ▼a0307
■690 ▼a0369
■71020▼aCornell University▼bMolecular Biology and Genetics.
■7730 ▼tDissertation Abstracts International▼g75-10B(E).
■773 ▼tDissertation Abstract International
■790 ▼a0058
■791 ▼aPh.D.
■792 ▼a2014
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T14824050▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
■980 ▼a20180515▼f2018



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