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• W2023016180 endingPage "13780" @default.
• W2023016180 startingPage "13772" @default.
• W2023016180 abstract "Complexes of four peptides [KWGK, KGWK, K(6MeW)GK, KG(6MeW)K] with the nucleic acids [poly(A), poly(C), poly(U), poly(I), and rG(8)] have been investigated by phosphorescence and optically detected magnetic resonance (ODMR) spectroscopy. The intrinsic spectroscopic probes used in these studies are tryptophan (W) and 6-methyltryptophan (6MeW). Binding to the nucleic acids results in a red-shift of the phosphorescence 0,0-band (delta E(0,0)) of the aromatic residue as well as a reduction of its zero-field splitting parameter (delta D). Results are compared with earlier studies of the HIV-1 nucleocapsid protein, NCp7, that contains a single tryptophan residue (Trp37) within a retroviral zinc finger sequence. Binding of poly(A) or poly(U) to the tetrapeptides induces larger delta E(0,0) and delta D than when bound to NCp7, indicating stronger stacking interactions. Poly(I), on the other hand, produces larger shifts in Trp37 of NCp7. Binding of rG(8) produces sequence-dependent effects in the peptides. When bound to NCp7, but in contrast with tetrapeptide binding, nucleic acids produce large changes in triplet state kinetics consistent with enhanced spin-orbit coupling. These results are discussed in terms of three limiting types of tryptophan-base interaction: intercalation, aromatic stacking, and edge-on interaction. These should have differing effects on the properties of the triplet state." @default.
• W2023016180 created "2016-06-24" @default.
• W2023016180 creator A5048254108 @default.
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• W2023016180 creator A5060259177 @default.
• W2023016180 creator A5090810688 @default.
• W2023016180 date "2000-10-21" @default.
• W2023016180 modified "2023-09-23" @default.
• W2023016180 title "Effect of Nucleic Acid Binding on the Triplet State Properties of Tetrapeptides Containing Tryptophan and 6-Methyltryptophan: A Study by Phosphorescence and ODMR Spectroscopy" @default.
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• W2023016180 doi "https://doi.org/10.1021/bi0015663" @default.
• W2023016180 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11076516" @default.
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