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001-es BibID:	BIBFORM082814
035-os BibID:	(cikkazonosító)e0227062 (WOS)000534341100013 (Scopus)85077691494
Első szerző:	Gazda Lívia Diána
Cím:	Biochemical characterization of Ty1 retrotransposon protease / Lívia Diána Gazda, Krisztina Joóné Matúz, Tibor Nagy, János András Mótyán, József Tőzsér
Dátum:	2020
ISSN:	1932-6203
Megjegyzések:	Ty1 is one of the many transposons in the budding yeast Saccharomyces cerevisiae. The life-cycle of Ty1 shows numerous similarities with that of retroviruses, e.g. the initially synthesized polyprotein precursor undergoes proteolytic processing by the protease. The retroviral proteases have become important targets of current antiretroviral therapies due to the critical role of the limited proteolysis of Gag-Pol polyprotein in the replication cycle and they therefore belong to the most well-studied enzymes. Comparative analyses of retroviral and retroviral-like proteases can help to explore the key similarities and differences which may help understanding how resistance is developed against protease inhibitors, but the available information about the structural and biochemical characteristics of retroviral-like, and especially retrotransposon, proteases is limited. To investigate the main characteristics of Ty1 retrotransposon protease of Saccharomyces cerevisiae, untagged and His6-tagged forms of Ty1 protease were expressed in E. coli. After purification of the recombinant proteins, activity measurements were performed using synthetic oligopeptide and fluorescent recombinant protein substrates, which represented the wild-type and the modified forms of naturally occurring cleavage sites of the protease. We investigated the dependence of enzyme activity on different reaction conditions (pH, temperature, ionic strength, and urea concentration), and determined enzyme kinetic parameters for the studied substrates. Inhibitory potentials of 10 different protease inhibitors were also tested. Ty1 protease was not inhibited by the inhibitors which have been designed against human immunodeficiency virus type 1 protease and are approved as antiretroviral therapeutics. A quaternary structure of homodimeric Ty1 protease was proposed based on homology modeling, and this structure was used to support interpretation of experimental results and to correlate some structural and biochemical characteristics with that of other retroviral proteases.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk retrotransposon Ty1 protease retrovirus homology modeling ty1 protease retroviral protease retrotransposon protease yeast biochemical characterization
Megjelenés:	Plos One. - 15 : 1 (2020), p. 1-24. -
További szerzők:	Matúz Krisztina (1980-) (vegyész, biokémikus) Nagy Tibor (1988-) (vegyész) Mótyán János András (1981-) (biokémikus, molekuláris biológus) Tőzsér József (1959-) (molekuláris biológus, biokémikus, vegyész)
Pályázati támogatás:	GINOP-2.3.2-15-2016-00044 GINOP GINOP-2.3.3-15-2016-00021 GINOP
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM056379
035-os BibID:	Article ID: e113221
Első szerző:	Mahdi, Mohamed (orvos, tudományos segédmunkatárs)
Cím:	A Modular System to Evaluate the Efficacy of Protease Inhibitors against HIV-2 / Mohamed Mahdi, Krisztina Matúz, Ferenc Tóth, József Tőzsér
Dátum:	2014
ISSN:	1932-6203
Megjegyzések:	The human immunodeficiency virus (HIV) protease is a homodimeric aspartyl protease that is crucial for the viral life-cycle, cleaving proviral polyproteins, hence creating mature protein components that are required for the formation of an infectious virus. With diagnostic measures and clinically used protease inhibitors focusing on HIV-1, due to its higher virulence and prevalence, studies of the efficacy of those inhibitors on HIV-2 protease remain widely lacking. Utilizing a wild-type HIV-2 vector backbone and cloning techniques we have developed a cassette system where the efficacy of clinically used protease inhibitors can be studied for various serotypes of HIV-2 protease both in enzymatic and cell culture assays. In our experiments, optimization of the expression protocol led to a relatively stable enzyme, for cell culture assays, the efficiency of transfection and transduction capability of the modified vector was tested and was not found to differ from that of the wild-type, moreover, a 2nd generation protease inhibitor was used to demonstrate the usefulness of the system. The combination of assays performed with our cassette system is expected to provide an accurate measure of the efficacy of currently used; as well as experimental protease inhibitors on HIV-2.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban HIV-2
Megjelenés:	Plos One. - 9 : 11 (2014), p. 1-13. -
További szerzők:	Matúz Krisztina (1980-) (vegyész, biokémikus) Tóth Ferenc (1980-) (molekuláris biológus) Tőzsér József (1959-) (molekuláris biológus, biokémikus, vegyész)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
Borító:
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