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001-es BibID:	BIBFORM019809
Első szerző:	Boross Péter (biokémikus, vegyész)
Cím:	Improved purification protocol for wild-type and mutant human foamy virus proteases / Péter Boross, József Tőzsér, Péter Bagossi
Dátum:	2006
ISSN:	1046-5928
Megjegyzések:	Wild-type and an active site mutant (S25T) human foamy virus (HFV) proteases were expressed in fusion with maltose binding protein in Escherichia coli. The mutant enzyme contained a Ser to Thr mutation in the -Asp-Ser-Gly- active site triplet of the enzyme, which forms the "fireman's grip" between the two subunits of the homodimeric enzyme. The fusion proteins were purified by affinity chromatography on amylose resin, cleaved with factor Xa, and the processed enzymes were purified by gel filtration under denaturing condition. Refolding after purification resulted in active enzymes with comparable yields. Furthermore, both enzymes showed similar catalytic activities in an oligopeptide substrate representing an HFV Gag cleavage site. However, the S25T mutant showed increased stability in urea unfolding experiment, in a good agreement with the suggested role of the Thr residue of fireman's grip.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:	Protein Expression And Purification. - 46 : 2 (2006), p. 343-347. -
További szerzők:	Tőzsér József (1959-) (molekuláris biológus, biokémikus, vegyész) Bagossi Péter (1966-2011) (biokémikus, vegyész)
Pályázati támogatás:	F25807 OTKA F25807 OTKA F34479 OTKA F35191 OTKA T43482 OTKA
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM040657
Első szerző:	Fehér Anita
Cím:	Expression of the murine leukemia virus protease in fusion with maltose-binding protein in Escherichia coli / Fehér Anita, Boross Péter, Sperka Tamás, Oroszlan Stephen, Tözsér József
Dátum:	2004
ISSN:	1046-5928
Megjegyzések:	The protease of murine leukemia virus (MLV) was cloned into pMal-c2 vector, expressed in fusion with maltose-binding protein (MBP), and purified to homogeneity after Factor Xa cleavage of the chimeric protein. Substantial degradation of the fusion protein was observed during expression, which severely diminished the yield. The degree of degradation of the fusion protein was even more pronounced when a single-chain form of the MLV protease was cloned after the gene coding for MBP. To increase the yield, a hexahistidine tag with an additional Factor Xa cleavage site was cloned after the protease and nickel chelate affinity chromatography was used as the first purification step. The modified procedure resulted in substantially higher yield as compared to the original procedure. The degradation of hexahistidine-tagged active site mutant MLV protease was very low and comparable to that obtained with hexahistidine-tagged MBP, but purified MLV protease alone was not able to degrade purified MBP, suggesting that during expression the active MLV protease may activate bacterial proteases which appear to be responsible for the degradation of the fusion proteins.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:	Protein Expression And Purification. - 35 : 1 (2004), p. 62-68. -
További szerzők:	Boross Péter (1972-) (biokémikus, vegyész) Sperka Tamás (1970-) (biokémikus, vegyész, biológia-kémia szakos tanár) Oroszlan, Stephen Tőzsér József (1959-) (molekuláris biológus, biokémikus, vegyész)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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