Chemistry and folding of photomodulable peptides – stilbene and thioaurone-type candidates for conformational switches
作者:Máté Erdélyi、Miranda Varedian、Christian Sköld、Ida B. Niklasson、Johanna Nurbo、Åsa Persson、Jonas Bergquist、Adolf Gogoll
DOI:10.1039/b812001c
日期:——
Optimized synthetic strategies for the preparation of photoswitchable molecular scaffolds based on stilbene or on thioaurone chromophores and their conformationally directing properties, as studied by computations and by NMR spectroscopy, are addressed. For the stilbene peptidomimetics 1, 2 and 3, the length of connecting linkers between the chromophore and the peptide strands was varied, resulting in photochromic dipeptidomimetics with various flexibility. Building blocks of higher rigidity, based on para-substituted thioaurone (4 and 6) and meta-substituted thioaurone chromophores (5 and 7) are shown to have a stronger conformationally directing effect. Design, synthesis, theoretical and experimental conformational analyses are presented.
This invention discloses a functional monomer, its use in a polymer, a rubbery composition, a tire, and a process to make such a rubbery composition. The functional monomer has a structural formula selected from the group consisting of:
wherein the R1 groups can be the same or different and represent hydrogen atoms or alkyl groups containing from 1 to 8 carbon atoms, wherein R2 represents a hydrogen atom or an alkyl group containing from 1 to 8 carbon atoms, wherein R3 represents a hydrogen atom or an alkyl group containing from 1 to 8 carbon atoms, wherein R4 represents a hydrogen atom or an alkyl group containing from 1 to 8 carbon atoms, with the proviso that if R3 represents an alkyl group then R4 represents a hydrogen atom, and with the proviso that R4 represents an alkyl group then R3 represents a hydrogen atom, and wherein the R5 groups can be the same or different and represent alkyl groups containing from 1 to 8 carbon atoms.
A New Tool in Peptide Engineering: A Photoswitchable Stilbene-type β-Hairpin Mimetic
作者:Máté Erdélyi、Anders Karlén、Adolf Gogoll
DOI:10.1002/chem.200500648
日期:2006.1
standard spectroscopic techniques (nuclearOverhausereffects, amide temperature coefficients, circulardichroism spectroscopy), the applicability of self-diffusion measurements (longitudinal eddy current delay pulsed-field gradient spin echo (LED-PGSE) NMR technique) in conformational studies of oligopeptides is demonstrated. The title compound shows photoisomerization of the stilbene chromophore, resulting