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Conformational phase diagram of poly(l-lysine) in sodium alkanesulfonate aqueous solutions at various temperatures

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Abstract

The conformation of poly(l-lysine) (PLL) was investigated in sodium alkanesulfonate CnSO3Na (n=8, 7) at various temperatures by circular dichroism spectrum measurements. C8SO3Na induced a double-step conformational change from a coil, to a β-sheet, and then to an α-helix, in which C7SO3Na induced a single-step coil-to-helix conformational change. Binding isotherms of C8SO3Na by PLL were constructed from the potentiometry of equilibrium concentration of the surfactant using a surfactant ion-selective electrode. The curves indicated the cooperative binding characteristic and were analyzed by a linear lattice model using the Bethe approximation. The thermodynamic parameters obtained from the model revealed that the binding of C8SO3Na by PLL was an entropy-driven process. The conformational change was observed at nearly full binding, presumably due to the surfactant clustering of the ordered conformation.

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Authors and Affiliations

  1. Kagoshima Prefectural Institute of Industrial Technology, 1445-1 Oda, Hayato, Aira-gun, Kagoshima, 899-5105, Japan

    Hiroshi Murata

  2. Department of Chemistry and BioScience, Faculty of Science, Kagoshima University, 1-21-35 Korimoto, Kagoshima, 890-0065, Japan

    Iwao Satake & Katumitu Hayakawa

  3. Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan

    Masaru Tanokura

Authors
  1. Hiroshi Murata
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  2. Iwao Satake
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  3. Katumitu Hayakawa
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  4. Masaru Tanokura
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Correspondence to Katumitu Hayakawa.

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Murata, H., Satake, I., Hayakawa, K. et al. Conformational phase diagram of poly(l-lysine) in sodium alkanesulfonate aqueous solutions at various temperatures. Colloid Polym Sci 284, 725–732 (2006). https://doi.org/10.1007/s00396-005-1418-y

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  • DOI: https://doi.org/10.1007/s00396-005-1418-y

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