Part of the Advances in Experimental Medicine and Biology book series (volume 611)
Light-Switchable Folding/Unfolding of the Collagen Triple Helix with Azobenzene-Containing Model Peptides
Azobenzene derivatives have been used as backbone constituents or side-chain clamps to photocontrol in reversible manner conformational states of model peptides [ 1, 2]. Because of the ultrafast isomerization (within picoseconds), this chromophore allows spectroscopic monitoring of the fast kinetics of folding/unfolding of model peptides with ordered secondary structure motifs such as β-turns, α-helices and most recently even of β-hairpins [ 3, 4]. Aim of the present work was to gain new insights into the kinetics of assembly of tertiary structure motifs such as the collagen triple helix. For this purpose model peptides were conformationally restricted with a suitable azobenzene clamp in the trans-isomeric state (see Figure 1), which upon photoisomerization provokes unfolding of the triple helix [ 5].
KeywordsTriple Helix Model Peptide Refold Process Collagen Chain Collagen Peptide
The work was funded by the DFG (SFB 533, grant A8).
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