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Titolo:
Influence of a substituent on amide nitrogen atom on fluorescence efficiency quenching of Tyr(Me) by amide group
Autore:
Lukomska, J; Rzeska, A; Malicka, J; Wiczk, W;
Indirizzi:
Univ Gdansk, Fac Chem, PL-80952 Gdansk, Poland Univ Gdansk Gdansk PolandPL-80952 sk, Fac Chem, PL-80952 Gdansk, Poland
Titolo Testata:
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
fascicolo: 2-3, volume: 143, anno: 2001,
pagine: 135 - 139
SICI:
1010-6030(20011010)143:2-3<135:IOASOA>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
TIME-RESOLVED FLUORESCENCE; ELECTRON-TRANSFER; CONFORMATIONAL DYNAMICS; ROTAMER POPULATIONS; PEPTIDES; TYROSINE; TRYPTOPHAN; KINETICS; DECAY; ACID;
Keywords:
O-methyl-tyrosine; tyrosine derivatives; fluorescence quenching; time-resolved fluorescence;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Wiczk, W Univ Gdansk, Fac Chem, Sobieskiego 18, PL-80952 Gdansk, Poland Univ Gdansk Sobieskiego 18 Gdansk Poland PL-80952 Gdansk, Poland
Citazione:
J. Lukomska et al., "Influence of a substituent on amide nitrogen atom on fluorescence efficiency quenching of Tyr(Me) by amide group", J PHOTOCH A, 143(2-3), 2001, pp. 135-139

Abstract

An amide group quenches the O-methyl-tyrosine fluorescence with higher efficiency than that of tyrosine because of a lower ionization potential of the former. The influence of methyl substituents on an amide nitrogen atom ofTyr(Me) amide, as well as distance dependence of the efficiency of fluorescence quenching by an additional amide group in Tyr(Me)-Gly dipeptide supported suggestion that the photo-induced electron transfer from the excited fluorophore to an an-dde group is responsible for the fluorescence quenchingof aromatic amino acid residue by an amide (peptide) group. The mono-exponential fluorescence intensity decay of Tyr(Me)-NHMe and much lower quenching efficiency than that observed for other Tyr(Me) derivatives studied, indicate that specific hydration of the whole molecule plays a crucial role in the fluorescence quenching process. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 15:44:38