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Heme Synthesis and Acquisition in Staphylococcus aureus
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| 자료유형 | 학위논문 |
|---|---|
| 서명/저자사항 | Heme Synthesis and Acquisition in Staphylococcus aureus. |
| 개인저자 | Choby, Jacob Edward. |
| 단체저자명 | Vanderbilt University. Microbiology and Immunology. |
| 발행사항 | [S.l.]: Vanderbilt University., 2019. |
| 발행사항 | Ann Arbor: ProQuest Dissertations & Theses, 2019. |
| 형태사항 | 247 p. |
| 기본자료 저록 | Dissertations Abstracts International 81-03B. Dissertation Abstract International |
| ISBN | 9781088319857 |
| 학위논문주기 | Thesis (Ph.D.)--Vanderbilt University, 2019. |
| 일반주기 |
Source: Dissertations Abstracts International, Volume: 81-03, Section: B.
Advisor: Skaar, Eric P. |
| 이용제한사항 | This item must not be sold to any third party vendors. |
| 요약 | The cofactor heme is essential to the growth and virulence of the human pathogen Staphylococcus aureus. S. aureus is capable of synthesizing heme de novo as well as acquiring it from host hemoglobin. The molecular mechanisms by which S. aureus regulates heme synthesis and the genetic requirements for heme synthesis were investigated. The membrane protein HemX was found to regulate heme synthesis by controlling abundance of the first heme biosynthetic enzyme, GtrR. HemX, which is broadly conserved across bacteria, controls GtrR levels post-transcriptionally to prevent excess heme synthesis. Additionally, heme auxotrophy increases GtrR abundance, making GtrR the key regulator of heme synthesis. Genetic dissection of heme synthesis genes suggests that gsaM is only partially required for heme synthesis, while cgoX is required for both aerobic and anaerobic heme synthesis. Turning to heme acquisition, rapid evolution was identified at the host-pathogen interface mediating heme uptake. Primate hemoglobin has been subject to positive selection at the interface of IsdB binding, the S. aureus hemoglobin receptor. Escape mutations arose over the course of evolutionary time that reduce IsdB binding, and IsdB preferentially binds modern human hemoglobin, consistent with S. aureus evolving to infect humans. Together, this Thesis identifies key mechanisms by which S. aureus acquires and synthesizes heme to support physiology and pathogenesis. |
| 일반주제명 | Microbiology. |
| 언어 | 영어 |
| 바로가기 | 
: 이 자료의 원문은 한국교육학술정보원에서 제공합니다. |
