Evidence from circular dichroism for the binding of hydrogen ions and calcium ions by poly(L‐proline)
- 1 January 1976
- journal article
- research article
- Published by Wiley in Biopolymers
- Vol. 15 (1) , 15-19
- https://doi.org/10.1002/bip.1976.360150103
Abstract
The positive circular dichroism band observed near 228 nm with poly(L‐proline) responds in a similar fashion to HCl and CaCl2. The spectra in the HCl solutions are compatible with a simple binding equation and a pK near −2 for the dissociation of a proton from a protonated peptide bond in poly(L‐proline). The data obtained in CaCl2 is susceptible to the same analysis, suggesting a pK near −1.5 for the dissociation of a calcium ion from its complex with poly(L‐proline).Keywords
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