Hydrogen-bond Energetics Drive Helix Formation in Membrane Interfaces

Overview

Journal Biochim Biophys Acta

Specialties Biochemistry
Biophysics

Date 2011 Aug 2

PMID 21802405

Citations 30

Authors

Paulo F Almeida

Alexey S Ladokhin

Stephen H White

Affiliations

Soon will be listed here.

Abstract

The free energy cost ΔG of partitioning many unfolded peptides into membrane interfaces is unfavorable due to the cost of partitioning backbone peptide bonds. The partitioning cost is dramatically reduced if the peptide bonds participate in hydrogen bonds. The reduced cost underlies secondary structure formation by amphiphilic peptides partitioned into membrane interfaces through a process referred to as partitioning-folding coupling. This coupling is characterized by the free energy reduction per residue, ∆G(res) that drives folding. There is some debate about the correct value of ∆G(res) and its dependence on the hydrophobic moment (μ(H)) of amphiphilic α-helical peptides. We show how to compute ∆G(res) correctly. Using published data for two families of peptides with different hydrophobic moments and charges, we find that ∆G(res) does not depend upon μ(H). The best estimate of ∆G(res) is -0.37 ± 0.02 kcal mol(-1). This article is part of a Special Issue entitled: Membrane protein structure and function.

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