Conformational analysis and helical preferences of normal and α,α‐dialkyl amino acids

Edward E. Hodgkin, John D. Clark, Katherine R. Miller, Garland R. Marshall

Research output: Contribution to journalArticle

55 Scopus citations

Abstract

Energy calculations have been performed on right‐handed helical structures of L‐alanine and α‐methylalanine oligomers. A new ′3.610′‐helix is described for α‐methylalanine peptides. The dependence of the relative stability of the α, 310, and 3.610 structural forms on helix length, dielectric, and force‐field, in the gas phase, has been studied. Potential energy surfaces for the interconversion of helices have been generated. The 310‐helix in α‐methylalanine oligomers exhibits a degree of enthalpic and entropic stabilization not observed for alanine. The relevance of the results to the formation of voltage‐sensitive ion channels is discussed.

Original languageEnglish
Pages (from-to)533-546
Number of pages14
JournalBiopolymers
Volume30
Issue number5-6
DOIs
StatePublished - 1990

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