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.
Photochemical Regulation of an Artificial Hydrolase by a Backbone Incorporated Tertiary Structure Switch
作者:N. Johan V. Lindgren、Miranda Varedian、Adolf Gogoll
DOI:10.1002/chem.200801808
日期:2009.1.2
chromophore has been incorporated into the turn region of a 42 amino acid peptide, linking two helical peptide sections. Spatial proximity between these sections, as well as aggregation into dimers, is required to facilitate the catalytic function of this artificialhydrolase. Photomodulation of the hydrolase activity results in an increase of the activity of 42 % upon switching from the trans to the
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