Repozytorium Uniwersytetu Jagiellońskiego
Adsorption of neurotensin-family peptides on SERS-active Ag substrates
Adsorption of neurotensin-family peptides on SERS-active ...
Opis pozycji
| tytuł: | Adsorption of neurotensin-family peptides on SERS-active Ag substrates |
| autor: | Podstawka-Proniewicz Edyta, Kudelski Andrzej, Kim Younkyoo, Proniewicz Leonard 
|
| tytuł czasopisma: | Journal of Raman Spectroscopy |
| tom: | 43 |
| numer: | 9 |
| data wydania: | 2012 |
| strony: | 1196-1203 |
| ISSN: |
0377-0486 |
| eISSN: |
1097-4555 |
| DOI: | |
| język: | angielski |
| język czasopisma: | angielski |
| abstrakt w j. angielskim: | Kinetensin (KN) and its amino acids 1 – 8 fragment ([des-Leu 9 ]KN), neuromedin N (NMN), and xenopsin (XP) and its two analogs (XP-1 and XP-2) belong to the neurotensin family of peptides and are known to stimulate the growth of human tumors. In this work, we report Fourier transform-Raman and surface-enhanced Raman scattering (SERS) studies of these peptides and discuss their structures, orientation, and mode of adsorption onto a highly speci fi c, electrochemically roughened SERS-active Ag electrode that is characterized by the formation of a 50 – 150nm Ag island on its surface. We show that the investigated peptides bind preferentially to this surface by substantial electronic overlap between the metal surface and the p -orbitals of the benzene rings of the Phe, Tyr, and Trp residues, which forces them to take parallel or almost parallel orientations with respect to the surface. In addition, the – CH 2 – , – CNH 2 , and – COO - molecular fragments are involved in interactions with (binding to or in close proximity with) the Ag surface. The SERS data show that the adsorption modes in each of these cases are very similar. In addition, we show that the speci fi c differences in the amino acid sequences do not signi fi cantly affect the orientation of the investigated peptides on the Ag substrate. This result implies that the N -termini of the neurotensin-family peptides do not in fl uence the mode for adsorption onto the Ag substrates. |
| słowa kluczowe w j. angielskim: | surface-enhanced Raman scatterin, kinetensin, neurotensin-family peptides, neuromedin N, xenopsin |
| punktacja wydziałowa: | 35 |
| wydział:instytut/zakład/katedra: | Wydział Chemii : Zakład Fizyki Chemicznej |
| typ: | artykuł w czasopiśmie |
| podtyp: | artykuł |
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