在 etudie le transfert d'electron intramoleculaire le long de l'helice α dupeptide 上的固定组发色团 sur des 多肽(contenant surtout des glutamates)。练习曲 est effectuee sur le肽模型 Boc-dmaPhe-Ala-pyr Ala-OMe
The present invention relates to compounds of the formula
which are useful in treating diseases characterized by the hyperactivity of MEK. Accordingly the compounds are useful in the treatment of diseases, such as, cancer, cognative and CNS disorders and inflammatory/autoimmune diseases.
Electric Field Effects on Electron Transfer Rates in Dichromophoric Peptides: The Effect of Helix Unfolding
作者:Marye Anne Fox、Elena Galoppini
DOI:10.1021/ja963269k
日期:1997.6.1
The effect of helix unfolding on the rates of photoinducedelectrontransfer in model dichromophoricpeptides was investigated. Two α-helicalpeptides, 1 and 2, having an alternating Ala-Aib backbone and differing only in the position of an appended electron donor (N,N-dimethylaniline) and an appended photoexcited electron acceptor (pyrene) relative to the electricfieldgenerated by the helix, had
Photoinduced electron transfer in a single .alpha.-helical polypeptide chain: evidence of a through-space mechanism
作者:Yoshihito Inai、Masahiko Sisido、Yukio Imanishi
DOI:10.1021/j100162a074
日期:1991.5
alpha-Helical polypeptides containing a single pair of L-p-(dimethylamino)phenylalanine and L-l-pyrenylalanine were synthesized. The distance and orientation of the (dimethylamino)phenyl (D) and pyreyl (P) group were varied by inserting different numbers (m) of L-alanine units between the two artificial aromatic amino acids. The edge-to-edge distances between D and P groups, predicted from conformational energy calculations, were 5.4 angstrom for m = 0, 9.4 angstrom for m = 1, and 5.5 angstrom for m = 2. This indicates that the D-P pair in the m = 2 polypeptide is separated by a larger number of bonds but located closer than the D-P pair in the m = 1 polypeptide. The D-P pair in the m = 0 polypeptide was arranged in a head-to-tail manner, but that in the m = 2 polypeptide had a face-to-face arrangement. The rates of photoinduced electron transfer (ET) from the D to P* group at -20-degrees-C in trimethyl phosphate solution were evaluated from the decay time of P* fluorescence to be 1.9 x 10(7) (m = 0), 6.6 x 10(5) (m = 1), and 2.1 x 10(7) s-1 (m = 2). The results show that the ET is occurring through space, and the possibility for a helical polypeptide chain as an electron mediator was excluded, at least for this relatively short distance ET. The ET rate was not very sensitive to the orientation of the donor and acceptor groups.
Distance and orientation dependence of electron transfer and exciplex formation of naphthyl and p-dimethylanilino groups fixed on a helical polypeptide chain