화학공학소재연구정보센터
Journal of the American Chemical Society, Vol.129, No.43, 13043-13048, 2007
An artificial ss-sheet that dimerizes through parallel ss-sheet interactions
This Article introduces a simple chemical model of a beta-sheet (artificial beta-sheet) that dimerizes by parallel beta-sheet formation in chloroform solution. The artificial beta-sheet consists of two N-terminally linked peptide strands that are linked with succinic or fumaric acid and blocked along one edge with a hydrogenbonding template composed of 5-aminoanisic acid hydrazide. The template is connected to one of the peptide strands by a turn unit composed of (S)-2-aminoadipic acid (Aaa). H-1 NMR spectroscopic studies show that these artificial beta-sheets fold in CDCl3 solution to form well-defined beta-sheet structures that dimerize through parallel beta-sheet interactions. Most notably, all of these compounds show a rich network of NOES associated with folding and dimerization. The compounds also exhibit chemical shifts and coupling constants consistent with the formation of folded dimeric P-sheet structures. The aminoadipic acid unit shows patterns of NOES and coupling constants consistent with a well-defined turn conformation. The present system represents a significant step toward modeling the type of parallel P-sheet interactions that occur in protein aggregation.