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undergraduate thesis
Regulacija staničnog ciklusa ubikvitinacijom proteina
Zagreb: University of Zagreb, Faculty of Science, 2009. urn:nbn:hr:217:428700
Klasić, Marija
University of Zagreb
Faculty of Science
Department of Biology

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Klasić, M. (2009). Regulacija staničnog ciklusa ubikvitinacijom proteina (Undergraduate thesis). Zagreb: University of Zagreb, Faculty of Science. Retrieved from https://urn.nsk.hr/urn:nbn:hr:217:428700

Klasić, Marija. "Regulacija staničnog ciklusa ubikvitinacijom proteina." Undergraduate thesis, University of Zagreb, Faculty of Science, 2009. https://urn.nsk.hr/urn:nbn:hr:217:428700

Klasić, Marija. "Regulacija staničnog ciklusa ubikvitinacijom proteina." Undergraduate thesis, University of Zagreb, Faculty of Science, 2009. https://urn.nsk.hr/urn:nbn:hr:217:428700

Klasić, M. (2009). 'Regulacija staničnog ciklusa ubikvitinacijom proteina', Undergraduate thesis, University of Zagreb, Faculty of Science, accessed 16 January 2025, https://urn.nsk.hr/urn:nbn:hr:217:428700

Klasić M. Regulacija staničnog ciklusa ubikvitinacijom proteina [Undergraduate thesis]. Zagreb: University of Zagreb, Faculty of Science; 2009 [cited 2025 January 16] Available at: https://urn.nsk.hr/urn:nbn:hr:217:428700

M. Klasić, "Regulacija staničnog ciklusa ubikvitinacijom proteina", Undergraduate thesis, University of Zagreb, Faculty of Science, Zagreb, 2009. Available at: https://urn.nsk.hr/urn:nbn:hr:217:428700

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Metadata
TitleRegulacija staničnog ciklusa ubikvitinacijom proteina
Title (english)Cell cycle regulation by protein ubiquitination
AuthorMarija Klasić
MentorDunja Leljak-Levanić (mentor)
GranterUniversity of Zagreb
Faculty of Science
(Department of Biology)
Zagreb
Defense date and country2009, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Biology
Abstract
Stanični ciklus eukariotskih stanica mora biti vrlo precizno reguliran. Prilikom stanične diobe događaju se morfološke promjene koje su prostorno i vremenski dobro regulirane tako da bi se genom jednako raspodijelio u stanice kćeri. Regulacija se postiže fosforilacijom proteina i ciljanom razgradnjom. Razgradnja je ovisna o ubikvitinu, a u cijelom procesu sudjeluju 3 tipa enzima: E1, enzim koji aktivira ubikvitin, E2, enzim koji spaja ubikvitin i E3, ubikvitin protein ligaza. Najvažnije vrste E3 ubikvitin ligaza koje sudjeluju u regulaciji staničnog ciklusa su ligaze tipa APC/C, SCF i E3 ligaze ovisne o kulinu3. Ligaze APC/C omogućuju prijelaz iz metafaze u anafazu degradiranjem sekurina koji je inhibitor separaze i izlazak iz mitoze degradiranjem mitotskih ciklina. SCF-kompleksi reguliraju rane stadije mitoze i citokinezu. Oni sudjeluju u kontroli aktivnosti kompleksa Cdc2-ciklin B, jednog od ključnih regulatora staničnog ciklusa. Njegovom aktivacijom potiče se prijelaz iz G2- u M-fazu. Ligaze ovisne o kulinu3 kontroliraju položaj kromosoma i citokinezu. Kod ljudi je kompleks kulin3-KLHL9-KLHL-13 potreban za pravilno vezanje kromosoma i napredovanje mitoze tako što ubikvitinira protein Aurora B koji disocira s mitotskih kromosoma prilikom njihovog poravnavanja u metafaznu ploču. Da bi došlo do razdvajanja sestrinskih kromatida u anafazi, mora se degradirati kohezin koji ih drži zajedno. Za izlazak iz mitoze važna je inaktivacija kinaza ovisnih o ciklinima (CDK). U regulaciji staničnog ciklusa sudjeluje puno proteina koji su indirektno ili direktno povezani. U cijeloj toj mreži proteina, vrlo je teško otkriti sve proteine i njihove funkcije koje su vjerojatno mnogobrojne.
Abstract (english)
Cell cycle of eukaryotic cells has to be strictly regulated. During cell division, many morphological changes which are temporary and spatially precisely regulated occur to ensure equal distribution of the newly replicated copies of genome into the two daughter cells. Two mechanisms ensure cell cycle regulation: phosphorylation and targeted proteolysis. Targeted, ubiquitin-dependent proteolysis is regulated by three types of enzymes: E1, ubiquitin-activating enzyme, E2, ubiquitin-conjugating enzyme and E3, ubiquitin protein ligase. Most important E3 ligases which regulate cell cycle are APC/C, SCF and Cullin3-based E3 ligase complex. The APC/C is required for triggering the metaphase to anaphase transition and mitotic exit regulation. This complex degrades the separase inhibitor securin and mitotic cyclins. SCF complexes regulate early stages of mitosis and citokinesis by the control of Cdc2-cyclin B activity, a key regulator of cell cycle. It ensures G2 to M phase transition. Cullin3-based E3 ligases control chromosome position and citokinesis. Human Cullin3- KLHL9-KLHL-13 complex ensures chromosome attachment and progress of mitotis by degradation of Aurora B which dissociate from mitotic chromosome during chromosome alignment in prometaphase. Sister chromatids are held together by cohesin, which has to be eliminated for proper chromosome segregation in anaphase. Cyclin-dependend kinases (CDKs) inactivation is very important for mitotic exit. Many proteins, which are directly or indirectly connected, are involved in cell cycle regulation. In this network, it is very difficult to find out every single protein and its functions.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:217:428700
Study programmeTitle: Molecular Biology
Study programme type: university
Study level: undergraduate
Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) molekularne biologije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) molekularne biologije)
Type of resourceText
File originBorn digital
Access conditionsOpen access
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RepositoryRepository of the Faculty of Science
Created on2018-03-12 13:01:16

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