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Vrednotenje afinitete vezave represorja Tet na ciljno mesto DNA ob prisotnosti efektorja, podobnega transkripcijskemu aktivatorju (TALE) [A] = Assessment of Tet repressor binding affinity to cognate DNA target in the presence of transcription activator-like effector (TALE) [A] : enoviti magistrski študij farmacijeDragovan, MatejEfektorji, podobni transkripcijskim aktivatorjem (ang. transcription activator-like effectors, TALEs), so proteini, ki jih zaradi možnosti vezave na definirana vezavna mesta na polinukleotidni verigi ... na široko uporabljamo v sintezni biologiji. Sestavljajo jih številne kratke ponovitve aminokislinskih zaporedij (t.i. moduli oz. kanonične ponovitve iz 33 do 35 ostankov). Specifičnost TALE je mogoče urejati s spreminjanjem po dveh aminokislinskih ostankov v modulih, ki prepoznavajo in se vežejo na zaporedne nukleotide na eni od verig DNA. Poleg spajanja z efektorskimi domenami in urejanja DNA lahko vplivajo na nivo transkripcije, ki ga sproži drug transkripcijski dejavnik. S ciljem ovrednotiti afinetito vezave transkripcijskega dejavnika TetR ob hkratni vezavi proteina TALE [A] na DNA smo oba proteina izrazili v bakterijah Escherichia coli. Izolirali smo ju s kovinsko-kelatno afinitetno kromatografijo in dodatno prečistili z gelsko filtracijo. Pri tem smo z namenom optimizacije čiščenja preizkusili več različnih kromatografskih pufrov. Z analitsko gelsko filtracijo, sklopljeno z večkotnim sipanjem laserske svetlobe (SEC-MALS) ter s tehnikama dinamičnega sipanja svetlobe in poliakrilamidne gelske elektroforeze v prisotnosti natrijevega lavrilsulfata smo pokazali, da sta eksperimentalno določeni velikosti in molski masi primerljivi s teoretičnimi vrednostmi le teh in dokazali, da proteina med seboj ne interagirata. S testom zamika elektroforezne mobilnosti (ang. electrophoretic mobility shift assay, EMSA) smo določili disociacijsko konstanto TetR pri vezavi na DNA, medtem ko pri vezavi TALE [A] na DNA in vezavi TetR na DNA v prisotnosti TALE [A], nismo mogli določiti Kd zaradi nekonstantnosti vezave TALE [A] na DNA. Predpostavljamo, da so za to odgovorna različna konformacijska stanja rekombinantnega TALE [A].Type of material - master's thesis ; adult, seriousPublication and manufacture - Ljubljana : [M. Dragovan], 2022Language - slovenianCOBISS.SI-ID - 136043779
Author
Dragovan, Matej
Other authors
Bratkovič, Tomaž, farmacevt, 1978- |
Leben, Katja, 1992-
Topics
Proteini |
TALE |
efektorji podobni transkripcijskim aktivatorjem |
TetR |
uravnavanje transkripcije |
optimizacija izolacije |
afiniteta vezave
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Library/institution |
City | Acronym | For loan | Other holdings |
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Faculty of Pharmacy, Ljubljana | Ljubljana | FFALJ |
reading room 1 cop.
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Year | Impact factor | Edition | Category | Classification | ||||
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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DRS, in which the journal is indexed
Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Dragovan, Matej | ![]() |
Bratkovič, Tomaž, farmacevt, 1978- | 23598 |
Leben, Katja, 1992- | 39112 |
Source: Personal bibliographies
and: SICRIS
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