Journal
CHEMICAL & PHARMACEUTICAL BULLETIN
Volume 49, Issue 12, Pages 1512-1516Publisher
PHARMACEUTICAL SOC JAPAN
DOI: 10.1248/cpb.49.1512
Keywords
atomic force microscopy; single molecule; poly-L-lysine; peptide; force-extension curve
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Using atomic force microscopy (AFM), the length of the alpha -helix structure Of poly-L-lysine was investigated by stretching the peptide directly, one molecule at a time. In the absence of urea, many rupturing points that seemed to be due to the breaking of some hydrogen bonds were observed in force-extension curves, while these points were never observed in the presence of 8 M urea. In the presence of 0.4 or 1.6 M urea, both force-extension curve types were observed. Total peptide elongation for each condition was calculated from force-extension curves reflecting the alpha -helix rupturing process. The experimental value of total elongation divided by the theoretical value of total alpha -helix elongation yields the alpha -helix content. This value was compatible with circular dichroism (CD) measurement results. This suggests that peptide conformation and content of the alpha -helix on a single molecule scale can be investigated by direct mechanical measurement using atomic force microscopy.
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