Metal Trafficking During Limitation and Excess in Bacillus subtilis- [electronic resource]
Metal Trafficking During Limitation and Excess in Bacillus subtilis- [electronic resource]
- 자료유형
- 학위논문파일 국외
- 최종처리일시
- 20240214100126
- ISBN
- 9798379712143
- DDC
- 576
- 서명/저자
- Metal Trafficking During Limitation and Excess in Bacillus subtilis - [electronic resource]
- 발행사항
- [S.l.]: : Cornell University., 2023
- 발행사항
- Ann Arbor : : ProQuest Dissertations & Theses,, 2023
- 형태사항
- 1 online resource(237 p.)
- 주기사항
- Source: Dissertations Abstracts International, Volume: 84-12, Section: B.
- 주기사항
- Advisor: Helmann, John D.
- 학위논문주기
- Thesis (Ph.D.)--Cornell University, 2023.
- 사용제한주기
- This item must not be sold to any third party vendors.
- 초록/해제
- 요약Metal ions are essential for maintaining cellular life, as they are used as cofactors in many reactions and can be utilized as structural components of proteins. Metal ions are so important to bacteria that sequestering these metals is an antibacterial strategy employed by vertebrate immune systems. For example, human neutrophils and epithelial cells secrete calprotectin, an abundant antimicrobial protein, which has been shown to sequester zinc and iron from bacterial pathogens such as Staphylococcus aureus, preventing infection. In Bacillus subtilis, a model system for low G+C Gram-positive bacteria, zinc and iron are required for several essential processes. To maintain homeostasis of the concentrations of these metals, transcriptional regulators control gene expression to combat limitation and excess.Genes involved in responding to zinc excess are under the transcriptional control of CzrA, while genes involved in responding to zinc limitation are under the control of Zur. Zur derepresses genes in three distinct waves, one of which allows for the expression of the zinc importer ZnuABC and the metallochaperone ZagA. It is unknown how ZagA acquires zinc, where the zinc is chaperoned, or how metal transfer takes place. Here we discuss the idea that ZagA may acquire zinc from ZnuABC or zinc-containing ribosomal proteins. Potential clients of ZagA are also discussed.Genes involved in responding to iron limitation are controlled by Fur, and manganese homeostasis is controlled by the transcriptional repressor MntR, both of which control the expression of metal efflux systems. In addition, PerR is a transcriptional repressor that controls expression of PfeT, an iron efflux pump in response to peroxide stress. Here we show that PerR/Fur- and MntR-regulated efflux pumps (PfeT and MnePS, respectively) all contribute to iron efflux and metal ion homeostasis.Finally, this thesis touches upon basic statistical approaches in microbiology as well as a novel outreach program, Write a Researcher, that promotes diversity, equity, and inclusion in STEM by mentoring middle and high school students.
- 일반주제명
- Microbiology.
- 일반주제명
- Biochemistry.
- 일반주제명
- Genetics.
- 키워드
- Bacteria
- 키워드
- DEI
- 키워드
- Homeostasis
- 키워드
- Metals
- 키워드
- Outreach
- 키워드
- Regulation
- 기타저자
- Cornell University Microbiology
- 기본자료저록
- Dissertations Abstracts International. 84-12B.
- 기본자료저록
- Dissertation Abstract International
- 전자적 위치 및 접속
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