Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor | Department of Applied Biology and Chemical Technology | en_US |
| dc.contributor.advisor | Kwok, Wai Ming (ABCT) | en_US |
| dc.creator | Ma, Huiya | - |
| dc.identifier.uri | https://theses.lib.polyu.edu.hk/handle/200/11414 | - |
| dc.language | English | en_US |
| dc.publisher | Hong Kong Polytechnic University | en_US |
| dc.rights | All rights reserved | en_US |
| dc.title | Spectroscopic study on oncogene promoter I-motif's folding behavior and stability at neutral pH | en_US |
| dcterms.abstract | During the past decades, there has been a notable growth in the application of spectroscopic techniques in chemistry and biology sciences since spectroscopy is one of the most accessible, easy-to-use and theory-supported methods to understand biomacromolecule behavior. In this project, both steady-state and time-resolved spectroscopic techniques have been applied. Amounts of UV-Vis absorption, fluorescence and circular dichroism measurements have been taken and analyzed. Here our study of interest is i-motif's folding behavior and stability under neutral pH environment. I-motif is a four-stranded DNA secondary structure built by intercalated hemiprotonated cytosine-cytosine base pairs, which predominantly exists at slightly acidic pH. Therefore, its folding ability under physiological pH condition is a long-lasting interested issue. In 2018, this unique DNA tetraplex structure has been proved to be exist in human nuclei. Then study towards i-motif becomes an interest to many research groups. Here in this project, we first selected several natural oncogene promoter i-motifs for investigation and then focused on c-MYC i-motif, an unusual stable one at pH 7. Concerning this central i-motif, we collected and studied its absorption, fluorescence, circular dichroism and transient absorption spectroscopic characteristics and used these to analyze and explore potential factors that influence i-motif's folding, stability, and binding with small molecules. Importantly, in this project, we discovered two new factors that influence the stability of i-motif structure at neutral pH, dangling end and buffer species, observed i-motif conformer phenomenon and characterized the binding behavior between i-motif and DAPI molecule. | en_US |
| dcterms.extent | xxii, 217 pages : color illustrations | en_US |
| dcterms.isPartOf | PolyU Electronic Theses | en_US |
| dcterms.issued | 2021 | en_US |
| dcterms.educationalLevel | M.Phil. | en_US |
| dcterms.educationalLevel | All Master | en_US |
| dcterms.LCSH | DNA -- analysis | en_US |
| dcterms.LCSH | Spectrum analysis | en_US |
| dcterms.LCSH | Hong Kong Polytechnic University -- Dissertations | en_US |
| dcterms.accessRights | open access | en_US |
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