Evaluation of interaction forces between profilin and designed peptide probes by atomic force microscopy |
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Authors: | Okada Tomoko Sano Masato Yamamoto Yuji Muramatsu Hiroshi |
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Affiliation: | School of Bionics, Tokyo University of Technology, Katakura, Hachioji, Tokyo, Japan. |
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Abstract: | We evaluated the binding affinity of peptide probes for profilin (protein) using force curve measurement techniques and atomic force microscopy (AFM). The peptide probes designed and synthesized for this investigation were H-A3GP5GP5GP5G-OH (1), H-A3GP5G-OH (2), H-A3G7-OH (3), and H-A3G-OH (4). Each peptide probe was immobilized on a cantilever tip, and the interaction force to profilin, immobilized on a mica substrate, was examined by force curve measurements. The retraction forces obtained showed a sequence-dependent affinity of the peptide probe for profilin. The retraction force for peptide probe 1 was the largest of the four probes examined, and it confirmed that peptide probe 1 has high affinity for profilin. The single molecular retraction force between peptide probe 1 and profilin was estimated to be 96 pN, as determined by Gaussian fitting to the histogram of the retraction forces. |
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