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Characterization of thermodynamically stabilizing mutations in a light-producing deoxyribozyme using NMR spectroscopy
Thesis title in Czech: Charakterizace termodynamicky stabilizujících mutací ve světlo-produkujícím deoxyribozymu pomocí NMR spektroskopie
Thesis title in English: Characterization of thermodynamically stabilizing mutations in a light-producing deoxyribozyme using NMR spectroscopy
Key words: deoxyribozym, katalytická DNA, termostabilita, tání, nukleární magnetická rezonance
English key words: deoxyribozyme, catalytic DNA, thermostability, melting, nuclear magnetic resonance
Academic year of topic announcement: 2020/2021
Thesis type: Bachelor's thesis
Thesis language: angličtina
Department: Laboratory of NMR Spectroscopy (31-204)
Supervisor: RNDr. Zdeněk Tošner, Ph.D.
Author: hidden - assigned by the advisor
Date of registration: 10.11.2020
Date of assignment: 10.11.2020
Date of electronic submission:23.08.2021
Date of proceeded defence: 07.09.2021
Opponents: Mgr. Klára Kohoutová
 
 
 
Advisors: Edward Arthur Curtis, Ph.D.
Preliminary scope of work
Ve spolupráci se skupinou Dr. Curtise se budeme věnovat studiu světlo-produkujícímu DNA enzymu a jeho mutacím, jejichž stabilita vzhledem k teplotě tání bude sledována pomocí 1H NMR spektroskopie.
Tato práce bude vedena v anglickém jazyce. Bližší náplň práce je tedy uvedena v anglické verzi.
Preliminary scope of work in English
Like proteins, DNA molecules can catalyze chemical reactions. Inspired by the potential uses of catalytic DNA, an artificial evolution was used in Dr. Curtis’ lab to identify a deoxyribozyme that catalyzes a chemiluminescent reaction. Our current goal is to obtain a structure of this deoxyribozyme at atomic-level resolution.
In the case of both protein and nucleic acid enzymes, high-resolution structural characterization is often facilitated by mutations that increase stability at high temperatures. A rational design approach was chosen to identify such modifications; a series of previously described stabilizing loops were inserted into a hairpin in the catalytic core of the deoxyribozyme, and NMR spectroscopy was used to characterize the effect of these loop sequences on the melting temperature of the deoxyribozyme.
Variable-temperature (VT) 1H-NMR spectra of these variants were measured, and the melting transition of their structure was investigated. In addition, the ability of deoxyribozymes to retain their catalytic activity at higher temperatures was studied and provided further insight into the sequence elements that demonstrate a thermostabilizing effect.
 
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