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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-) (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
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