Membrane Disordering is Not Sufficient for Membrane Permeabilization by Islet Amyloid Polypeptide: Studies of IAPP(20-29) Fragments

Overview

Journal Phys Chem Chem Phys

Publisher Royal Society of Chemistry

Specialties Biophysics
Chemistry

Date 2013 Mar 16

PMID 23493863

Citations 19

Authors

Jeffrey R Brender

Deborah L Heyl

Shyamprasad Samisetti

Samuel A Kotler

Joshua M Osborne

Ranadheer R Pesaru

Ayyalusamy Ramamoorthy

Affiliations

Soon will be listed here.

Abstract

A key factor in the development of type II diabetes is the loss of insulin-producing beta-cells. Human islet amyloid polypeptide protein (human-IAPP) is believed to play a crucial role in this process by forming small aggregates that exhibit toxicity by disrupting the cell membrane. The actual mechanism of membrane disruption is complex and appears to involve an early component before fiber formation and a later component associated with fiber formation on the membrane. By comparing the peptide-lipid interactions derived from solid-state NMR experiments of two IAPP fragments that cause membrane disordering to IAPP derived peptides known to cause significant early membrane permeabilization, we show here that membrane disordering is not likely to be sufficient by itself to cause the early membrane permeabilization observed by IAPP, and may play a lesser role in IAPP membrane disruption than expected.

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