Organic Syntheses: Vol. IV by Oliver (editor-in-chief) Kamm

By Oliver (editor-in-chief) Kamm

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Two arguments have been put forward recently, one assuming the coordination of an H O - embedded in the H 2 0 - n e t w o r k [19], the other identifying a significant role for the electrostatic 43 W,-D. Woggon field of the protein stabilizing the low-spin state in the presence of the water cluster [20]. On binding of camphor the water cluster is completely removed, including the sixth ligand, and the spin equilibrium is shifted to ,-~97% high spin iron(III) (S = ~), shortening slightly the distance of the iron to S- ligand [21].

In the following lines, we shall illustrate the potential of peptide nanostructures in miscellaneous areas. 1 Molecular Receptors Our research group and others have recently been interested in developing molecular receptors for biologically important compounds by taking advantage of peptides as frameworks. For instance, we and others have used crown ether modified peptides to develop molecular receptors that can complex (and potentially extract) selectively certain ions such as Cs +. As mentioned above, peptides 8-10 demonstrated a strong binding selectivity towards Cs ÷ [10l.

Stewart and co-workers [73] incorporated a "catalytic triad" from the serine proteases into a designed four ~-helix protein (80). In their design, they incorporated one of the amino acids involved in the catalytic function at the N-terminal side of the or-helices that are linked together by their C-terminal position (Fig. 29). The authors proposed that the oxyanion hole and the hydrophobic binding pocket are created by the three-dimensional structure formed by the folding of 80. A-R. NH 2 78 X= 8-¢yclodextrin-CH2- IG23CDI or X= adamantane-CH2-HN-CO-CH2- {G23ADI ~ G23C -D 79 t ~ H c c c ~ ~ G23-AD 33 Normand Voyer /..

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