✦ LIBER ✦

Effect of temperature and pH on the β–helix transition of poly(L-lysine) in sodium dodecyl sulfate solution

✍ Scribed by Iwao Satake; Jen Tsi Yang

Publisher: Wiley (John Wiley & Sons)
Year: 1975
Tongue: English
Weight: 280 KB
Volume: 14
Category: Article
ISSN: 0006-3525
DOI: 10.1002/bip.1975.360140906

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✦ Synopsis

Abstract

The conformational phase diagram of poly(L‐lysine) (4.6 × 10^−4^ M, residue) in sodium dodecyl sulfate (1.6 × 10^−2^ M) solution was constructed from circular dichroism results at various temperatures and pH's. Poly(L‐lysine)–sodium dodecyl sulfate complexes undergo a β–helix transition upon raising the pH of the solution. The transition pH tends to shift downward at elevated temperatures. No helix–β transition can be detected for poly(L‐lysine) in sodium dodecyl sulfate solution (pH > 11) even after 1‐hr heating at 70°C. This is in marked contrast with uncharged poly(L‐lysine) solution without sodium dodecyl sulfate, which is converted into the β‐form upon mild heating of the solution above 50°C.

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