1054661-52-7Relevant articles and documents
Photoinduced electron transfer on ?2-sheet cyclic peptides
Sasaki, Hiroshi,Makino, Maki,Sisido, Masahiko,Smith, Trevor A.,Ghiggino, Kenneth P.
, p. 10416 - 10423 (2001)
Gramicidin S analogues that contain a single pyrenyl group and a single p-nitrophenyl group at different positions were synthesized. Photoinduced electron transfer (ET) from an excited pyrenyl group located at the fourth position to a nitrophenyl group located at five different positions was investigated on the ?2-sheet chains of the cyclic peptides. The observed ET rate constants displayed a complex dependence on the number of spacer units or on the edge-to-edge distance between the two aromatic groups. The ET rate constants, however, showed a reasonable linear relationship with the equivalent ??-distances calculated from the Beratan-Onuchic tunneling pathway model, if through-hydrogen-bond ET was taken into account. The results support the applicability of the tunneling pathway model on both helix and ?2-sheet model peptides.