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001-es BibID:	BIBFORM016861
Első szerző:	Felföldi Nóra (vegyész)
Cím:	Synthesis of new glycosyl biuret and urea derivatives as potential glycoenzyme inhibitors / Nóra Felföldi, Marietta Tóth, Evangelia D. Chrysina, Maria-Despoina Charavgi, Kyra-Melinda Alexacou, László Somsák
Dátum:	2010
ISSN:	0008-6215
Megjegyzések:	O-Peracetylated 1-(beta-D-glucopyranosyl)-5-phenylbiuret was prepared in the reaction of O-peracetylated beta-D-glucopyranosylisocyanate and phenylurea. The reaction of O-peracetylated N-beta-D-glucopyranosylurea with phenylisocyanate furnished the corresponding 1-(beta-D-glucopyranosyl)-3,5-diphenyl- as well as 3-(beta-D-glucopyranosyl)-1,5-diphenyl biurets besides 1-(beta-D-glucopyranosyl)-3-phenylurea. O-Peracetylated 1-(beta-D-glucopyranosyl)-5-(beta-D-glycopyranosyl)biurets were obtained in one-pot reactions of O-peracetylated beta-D-glucopyranosylamine with OCNCOCl followed by a second glycopyranosylamine of beta-D-gluco, beta-D-galacto and beta-D-xylo configurations. O-Acyl protected 1-(beta-D-glucopyranosyl)-3-(beta-D-glycopyranosylcarbonyl)ureas were obtained from the reaction of beta-D-glucopyranosylisocyanate with C-(glycopyranosyl)formamides of beta-D-gluco and beta-D-galacto configurations. The O-acyl protecting groups were removed under acid- or base-catalyzed transesterification conditions, except for the N-acylurea derivatives where the cleavage of the N-acyl groups was faster than deprotection. Some of the new compounds exhibited moderate inhibition against rabbit muscle glycogen phosphorylase b and human salivary alpha-amylase.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban Glycosyl urea Glycosyl biuret Inhibitor alpha-Amylase Glycogen phosphorylase
Megjelenés:	Carbohydrate Research. - 345 : 2 (2010), p. 208-213. -
További szerzők:	Tóth Marietta (1974-) (vegyész) Chrysina, Evangelia D. Charavgi, Maria-Despoina Alexacou, Kyra-Melinda Somsák László (1954-) (vegyész)
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001-es BibID:	BIBFORM017316
Első szerző:	Kun Sándor (vegyész)
Cím:	Synthesis of variously coupled conjugates of d-glucose, 1,3,4-oxadiazole, and 1,2,3-triazole for inhibition of glycogen phosphorylase / Kun Sándor, Nagy Gergő Z., Tóth Marietta, Czecze Laura, Van Nhien Albert Nguyen, Docsa Tibor, Gergely Pál, Charavgi Maria-Despoina, Skourti Paraskevi V., Chrysina Evangelia D., Patonay Tamás, Somsák László
Dátum:	2011
ISSN:	0008-6215
Megjegyzések:	5-(O-Perbenzoylated-beta-d-glucopyranosyl)tetrazole was obtained from O-perbenzoylated-beta-d-glucopyranosyl cyanide by Bu(3)SnN(3) or Me(3)SiN(3)-Bu(2)SnO. This tetrazole was transformed into 5-ethynyl- as well as 5-chloromethyl-2-(O-perbenzoylated-beta-d-glucopyranosyl)-1,3,4-oxadiazoles by acylation with propiolic acid-DCC or chloroacetyl chloride, respectively. The chloromethyl oxadiazole gave the corresponding azidomethyl derivative on treatment with NaN(3). These compounds were reacted with several alkynes and azides under Cu(I) catalysed cycloaddition conditions to give, after removal of the protecting groups by the Zemplén protocol, beta-d-glucopyranosyl-1,3,4-oxadiazolyl-1,2,3-triazole, beta-d-glucopyranosyl-1,2,3-triazolyl-1,3,4-oxadiazole, and beta-d-glucopyranosyl-1,3,4-oxadiazolylmethyl-1,2,3-triazole type compounds. 5-Phenyltetrazole was also transformed under the above conditions into a series of aryl-1,3,4-oxadiazolyl-1,2,3-triazoles, aryl-1,2,3-triazolyl-1,3,4-oxadiazoles, and aryl-1,3,4-oxadiazolylmethyl-1,2,3-triazoles. The new compounds were assayed against rabbit muscle glycogen phosphorylase b and the best inhibitors had inhibition constants in the upper micromolar range (2-phenyl-5-[1-(beta-d-glucopyranosyl)-1,2,3-triazol-4-yl]-1,3,4-oxadiazole 36: K(i)=854gammaM, 2-(beta-d-glucopyranosyl)-5-[1-(naphthalen-2-yl)-1,2,3-triazol-4-yl]-1,3,4-oxadiazole 47: K(i)=745gammaM).
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban Molekulatudomány Molekuláris Medicina azide-alkyne cycloaddition tetrazole 1,2,3-triazole 1,3,4-oxadiazole beta-D-glucopyranosyl derivatives glycogen phosphorylase inhibitor
Megjelenés:	Carbohydrate Research. - 346 : 12 (2011), p. 1427-1438. -
További szerzők:	Nagy Gergő Zoltán (1985-) (vegyész) Tóth Marietta (1974-) (vegyész) Czecze Laura Van Nhien, Albert Nguyen Docsa Tibor (1975-) (vegyész, biokémikus) Gergely Pál (1947-) (biokémikus) Charavgi, Maria-Despoina Skourti, Paraskevi V. Chrysina, Evangelia D. Patonay Tamás (1951-2015) (vegyész) Somsák László (1954-) (vegyész)
Pályázati támogatás:	TÁMOP-4.2.1/B-09/1/KONV-2010-0007 TÁMOP Új típusú glikomimetikumok szintézise, kölcsönhatásaik és hasznosításuk tanulmányozása TÁMOP-4.2.1/B-09/1/KONV-2010-0007 TÁMOP Molekulakönyvtárak fejlesztése TÁMOP-4.2.1/B-09/1/KONV-2010-0007 TÁMOP I. Protein foszfatázok szerepe az in vitro porcdifferenciációban és a mechano-transzdukcióban, II. Hypoglykaemiás szerek tervezése a glikogén foszforilázra (foszforilációval és defoszforilációval szabályozott kulcsenzim) ható molekulákkal CK77712 OTKA CNK80709 OTKA
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001-es BibID:	BIBFORM006384
Első szerző:	Somsák László (vegyész)
Cím:	New inhibitors of glycogen phosphorylase as potential antidiabetic agents / L. Somsák, K. Czifrák, M. Tóth, É. Bokor, E. D. Chrysina, K.-M. Alexacou, J. M. Hayes, C. Tiraidis, E. Lazoura, D. D. Leonidas, S. E. Zographos, N. G. Oikonomakos
Dátum:	2008
ISSN:	0929-8673
Megjegyzések:	The protein glycogen phosphorylase has been linked to type 2 diabetes, indicating the importance of this target to human health. Hence, the search for potent and selective inhibitors of this enzyme, which may lead to antihyperglycaemic drugs, has received particular attention. Glycogen phosphorylase is a typical allosteric protein with five different ligand binding sites, thus offering multiple opportunities for modulation of enzyme activity. The present survey is focused on recent new molecules, potential inhibitors of the enzyme. The biological activity can be modified by these molecules through direct binding, allosteric effects or other structural changes. Progress in our understanding of the mechanism of action of these inhibitors has been made by the determination of high-resolution enzyme inhibitor structures (both muscle and liver). The knowledge of the three-dimensional structures of protein-ligand complexes allows analysis of how the ligands interact with the target and has the potential to facilitate structure-based drug design. In this review, the synthesis, structure determination and computational studies of the most recent inhibitors of glycogen phosphorylase at the different binding sites are presented and analyzed.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban glycogen phosphorylase inhibitor type 2 diabetes structure-based drug design antidiabetic agent
Megjelenés:	Current Medicinal Chemistry. - 15 : 28 (2008), p. 2933-2983. -
További szerzők:	Czifrák Katalin (1978-) (vegyész) Tóth Marietta (1974-) (vegyész) Bokor Éva (1982-) (vegyész) Chrysina, Evangelia D. Alexacou, Kyra-Melinda Hayes, Joseph M. Tiraidis, Costantinos Lazoura, E. Leonidas, Demetres D. Zographos, Spyros E. Oikonomakos, George N.
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