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001-es BibID:BIBFORM100915
035-os BibID:(cikkazonosító)542 (WoS)000615421600001 (Scopus)85100478135
Első szerző:Illyés Tünde Zita (kémia-fizika szakos tanár)
Cím:Synthesis of Tetravalent Thio- and Selenogalactoside-Presenting Galactoclusters and Their Interactions with Bacterial Lectin PA-IL from Pseudomonas aeruginosa / Tünde Zita Illyés, Lenka Malinovská, Erzsébet Rőth, Boglárka Tóth, Bence Farkas, Marek Korsák, Michaela Wimmerová, Katalin E. Kövér, Magdolna Csávás
Dátum:2021
ISSN:1420-3049
Megjegyzések:Synthesis of tetravalent thio- and selenogalactopyranoside-containing glycoclusters using azide-alkyne click strategy is presented. Prepared compounds are potential ligands of Pseudomonas aeruginosa lectin PA-IL. P. aeruginosa is an opportunistic human pathogen associated with cystic fibrosis, and PA-IL is one of its virulence factors. The interactions of PA-IL and tetravalent glycoconjugates were investigated using hemagglutination inhibition assay and compared with mono- and divalent galactosides (propargyl 1-thio- and 1-seleno-?-d-galactopyranoside, digalactosyl diselenide and digalactosyl disulfide). The lectin-carbohydrate interactions were also studied by saturation transfer difference NMR technique. Both thio- and seleno-tetravalent glycoconjugates were able to inhibit PA-IL significantly better than simple d-galactose or their intermediate compounds from the synthesis.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
selenoglycosides
galactoclusters
Pseudomonas aeruginosa
PA-IL lectin
multivalency
Megjelenés:Molecules. - 26 : 3 (2021), p. 1-11. -
További szerzők:Malinovská, Lenka Rőth Erzsébet (1957-) (vegyész) Tóth Boglárka Farkas Bence Korsák, Marek Wimmerová, Michaela Kövér Katalin, E. (1956-2023) (vegyész) Csávás Magdolna (1977-) (szénhidrátkémikus, vegyész)
Pályázati támogatás:K119509
OTKA
K128368
OTKA
GINOP-2.3.2-15-2016-00008
GINOP
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
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2.

001-es BibID:BIBFORM074773
035-os BibID:(WoS)000447365100107 (Scopus)85052664471
Első szerző:Nagy Tamás Milán (vegyész, nmr)
Cím:Photochemical and structural studies on cyclic peptide models / Tamás Milán Nagy, Krisztina Knapp, Eszter Illyés, István Timári, Gitta Schlosser, Gabriella Csík, Attila Borics, Zsuzsa Majer, Katalin E. Kövér
Dátum:2018
ISSN:1420-3049
Megjegyzések:UV irradiation has a significant impact on the structure and function of proteins that is supposed to be in relationship with the tryptophan-mediated photolysis of disulfide bonds. To investigate the correlation between the photoexcitation of Trp residues in polypeptides and the associated reduction of disulfide bridges, a series of small, cyclic oligopeptide models were analyzed in this work. Average distances between the aromatic side chains and the disulfide bridge were determined following molecular mechanics (MM) geometry optimizations. In this way, the possibility of cation-pi interactions was also investigated. Molecular mechanics calculations revealed that the shortest distance between the side chain of the Trp residues and the disulfide bridge is approximately 5 A in the cyclic pentapeptide models. Based on this, three tryptophan-containing cyclopeptide models were synthesized and analyzed by NMR spectroscopy. Experimental data and detailed molecular dynamics (MD) simulations were in good agreement with MM geometry calculations. Selected model peptides were subjected to photolytic degradation to study the correlation of structural features and the photolytic cleavage of disulfide bonds in solution. Formation of free sulfhydryl groups upon illumination with near UV light was monitored by fluorescence spectroscopy after chemical derivatization with 7-diethylamino-3-(4-maleimidophenyl)-4-methylcoumarin (CPM) and mass spectrometry. LC-MS measurements indicated the presence of multiple photooxidation products (e.g. dimers, multimers and other oxidated products), suggesting that besides the photolysis of disulfide bonds secondary photolytic processes take place.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
cyclopeptides
UV-irradiation
photolysis
disulfide bridges
NMR
MD
Megjelenés:Molecules. - 23 : 9 (2018), p. 1-20. -
További szerzők:Knapp Krisztina Illyés Eszter Timári István (1989-) (vegyész) Schlosser Gitta Csík Gabriella Borics Attila Májer Zsuzsa Kövér Katalin, E. (1956-2023) (vegyész)
Pályázati támogatás:GINOP-2.3.2-15-2016-00008
GINOP
GINOP-2.3.3-15-2016-00004
GINOP
NN 128368
OTKA
Internet cím:Intézményi repozitóriumban (DEA) tárolt változat
DOI
Szerző által megadott URL
Borító:
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