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Metal Trafficking During Limitation and Excess in Bacillus subtilis- [electronic resource]
Metal Trafficking During Limitation and Excess in Bacillus subtilis - [electronic resource...
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Metal Trafficking During Limitation and Excess in Bacillus subtilis- [electronic resource]
자료유형  
 학위논문파일 국외
최종처리일시  
20240214100126
ISBN  
9798379712143
DDC  
576
저자명  
Steingard, Caroline Helen.
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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