Excitonic Model for Strongly Coupled Multichromophoric Systems: The Electronic Circular Dichroism Spectra of Guanine Quadruplexes as Test Cases(14 views visite) Green JA, Asha H, Santoro F, Improta R
J Chem Theory Comput (ISSN: 1549-9618linking), 2021 Jan 12; 17(1): 405-415.
Keywords Parole chiave: Not available. Non disponibili.
Affiliations Affiliazioni: *** IBB - CNR ***
Consiglio Nazionale delle Ricerche, Istituto di Biostrutture e Bioimmagini (IBB-CNR), via Mezzocannone 16, I-80136 Napoli, Italy.
References Riferimenti: Not available. Non disponibili.
Excitonic Model for Strongly Coupled Multichromophoric Systems: The Electronic Circular Dichroism Spectra of Guanine Quadruplexes as Test Cases
We here propose a general and flexible approach, based on fragment diabatization, which incorporates charge transfer states and significantly increases the reliability of excitonic Hamiltonians for systems where the chromophores are very close. This model (FrDEx) is used to compute the electronic circular dichroism and absorption spectra of two prototype guanine-rich DNA sequences folded in quadruple helices (GQs), i.e., a fragment of the human telomeric sequence (Tel21, antiparallel), and (TGGGGT)(4) (TG4T, parallel). Calculations on different subsets of Tel21 and TG4T, from dimers to tetramers, show that FrDEx provides spectra close to the reference full quantum mechanical (QM) ones (obtained with time-dependent density functional theory), with significant improvements with respect to "standard" excitonic Hamiltonians. Furthermore, these tests enable the most cost-effective procedure for the whole GQ to be determined. FrDEx spectra of Tel21 and TG4T are also in good agreement with the QM and experimental ones and give access to interesting insights into the chemical-physical effects modulating the spectral signals. FrDEx could be profitably used to investigate many other biological and nanotechnological materials, from DNA to (opto)electronic polymers.
Excitonic Model for Strongly Coupled Multichromophoric Systems: The Electronic Circular Dichroism Spectra of Guanine Quadruplexes as Test Cases
Cusanno F, Cisbani E, Colilli S, Fratoni R, Garibaldi F, Giuliani F, Gricia M, Lucentini M, Magliozzi ML, Santarivenere F, Torrioli S, Cinti MN, Pani R, Pellegrini R, Simonetti G, Schillaci O, Del Vecchio S, Salvatore M, Majewski S, De Vincentis G, Scopinaro F * Results of clinical trials with SPEM(236 visite) Nucl Instrum Methods Phys Res Sect A, 2007 Feb 1; 497(1): 46-50. Impact Factor:3.221 DettagliEsporta in BibTeXEsporta in EndNote
383 Records (365 escludendo Abstract e Conferenze). Impact factor totale: 1433.888 (1387.654 escludendo Abstract e Conferenze). Impact factor a 5 anni totale: 1518.137 (1468.131 escludendo Abstract e Conferenze).
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