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Načrtovanje, sinteza in vrednotenje derivatov N-acetilglukozamina kot kovalentnih zaviralcev encima MurA = Design, synthesis, and evaluation of N-acetylglucosamine derivatives as covalent MurA inhibitors : Uniform Master's Study Programme PharmacyKastelic, Katarina, farmacevtkaPeptidoglikan je ključnega pomena pri rasti bakterij in njihovi sposobnosti preživetja. V citoplazemski fazi sinteze peptidoglikana imajo pomembno vlogo encimi iz družine Mur (MurA–MurF), ki ... pretvorijo UDP-N-acetilglukozamin v UDP-N-acetilmuramil-pentapeptid. Ta stopnja tako predstavlja tudi velik potencial za učinkovito zaviranje rasti in razmnoževanja bakterij. Prvo stopnjo v citoplazemskem delu sinteze katalizira encim MurA, čigar naloga je prenos enolpiruvata s fosfoenolpiruvata na UDP-N-acetilglukozamin, kar privede do tvorbe UDP-N-acetilglukozamin enolpiruvata. Edini trenutno registriran kovalentni zaviralec MurA je fosfomicin, ki je precej učinkovit, vendar je vedno bolj zaskrbljujoča odpornost bakterij nanj. Zdravilne učinkovine s kovalentnim mehanizmom delovanja delujejo tako, da imajo v strukturi reaktivno funkcionalno skupino, ki se s kovalentno vezjo poveže s tarčno molekulo in tvori stabilen kompleks tarča–zaviralec. V magistrski nalogi smo načrtovali, sintetizirali in ovrednotiti derivate N-acetilglukozamina kot potencialne kovalentne zaviralce encima MurA. UDP-N-acetilglukozamin je osnovni substrat encima MurA, zato smo poskušali N-acetilno skupino glukozamina nadomestiti z različnimi elektrofilnimi bojnimi glavami, ki bi lahko tvorile kovalentno vez s katalitičnim cisteinom. Izhajali smo iz naravnega sladkorja D-glukozamina: najprej smo zaščitili amino skupino v obliki imina, nato pa v obliki acetata še vse alkoholne skupine, po odstranitvi imina pa smo na prosto amino skupino uvedli različne elektrofilne bojne glave z reakcijami N-alkiliranja ter N-aciliranja. V zadnjem koraku smo poskusili odščititi acetatno zaščitno skupino z alkalno metanolizo, vendar so bili pogoji reakcije preveč agresivni – želenih odščitenih produktov nismo uspeli izolirati, zato smo v biološkem testiranju ovrednotili devet O-peracetiliranih derivatov N-acetilglukozamina (spojine 4–11 ter 20), ki so vsebovali različne elektrofilne bojne glave. Časovno-odvisno je encimsko aktivnost MurA iz bakterije E. coli zaviral le kloroacetamid 20, kar nakazuje, da je to zaviranje kovalentno. Kljub nakazani zaviralni aktivnosti na izoliranem encimu pa nobeden izmed derivatov ni zavrl rasti bakterij v protibakterijskih testih na dveh bakterijah – S. aureus in E. coli.Type of material - master's thesis ; adult, seriousPublication and manufacture - Ljubljana : [K. Kastelic], 2024Language - slovenianCOBISS.SI-ID - 191086595
Author
Kastelic, Katarina, farmacevtka
Other authors
Knez, Damijan, farmacevt |
Hrast, Martina
Topics
Bakterije |
peptidoglikan |
MurA |
derivati N-acetilglukozamina |
kovalentni zaviralci encima MurA |
elektrofilne bojne glave
Library | Call number – location, accession no. ... | Copy status |
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Faculty of Pharmacy, Lj. | Knjižnica emšf 579 KASTELIC KATARINA Načrtovanje 1366 IN: 0018113 |
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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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Kastelic, Katarina, farmacevtka | |
Knez, Damijan, farmacevt | 36438 |
Hrast, Martina | 32036 |
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