Helix–coil transition of poly‐N5‐(3‐hydroxypropyl)‐L‐glutamine: Thermodynamic and statistical analysis

Noah Lotan*, Mordechai Bixon, Arieh Berger

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The thermally induced conformational changes of poly‐N5‐(3‐hydroxypropyl)‐L‐glutamine in water and in methanol–water (3:7 v/v) have been analyzed in terms of the Lifson‐Roig theory. The transitions in both solvents can be described by using v = 0.017. The thermodynamic parameters for the random coil‐to‐helix transition of one amino acid residue at room temperature were found to be: in water, ΔH = − 130 cal/mole and ΔS = − 0.45 e.u.; in methanol–water (3:7 v/v), ΔH = − 170 cal mole and ΔS = − 0.45 e.u. The size distribution of helical segments is broad, and the results of numerical calculations are presented for three degrees of polymerization (DP = 100, 300, and 750).

Original languageEnglish
Pages (from-to)247-257
Number of pages11
JournalBiopolymers
Volume8
Issue number2
DOIs
StatePublished - Aug 1969

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