A leucine-rich repeat peptide derived from the Drosophila Toll receptor forms extended filaments with a beta-sheet structure.

Abstract:

:Leucine-rich repeats (LRRs) are 22-28 amino acid-long sequence motifs found in a family of cytoplasmic, membrane and extracellular proteins. There is evidence that LRRs function in signal transduction, cellular adhesion and protein-protein interactions. Here we report unusual properties of a synthetic LRR peptide derived from the sequence of the Drosophila membrane receptor Toll. In neutral solution the peptide forms a gel revealed by electron microscopy to consist of extended filaments approximately 8 nm in thickness. As the gel forms, the circular dichroism spectrum of the peptide solution changes from one characteristic of random coil to one associated with beta-sheet structures. Molecular modelling suggests that the peptide form an amphipathic structure with a predominantly apolar and charged surface. Based on these results, models for the gross structure of the peptides filaments and a possible molecular mechanism for cellular adhesion are proposed.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Gay NJ,Packman LC,Weldon MA,Barna JC

doi

10.1016/0014-5793(91)81110-t

keywords:

subject

Has Abstract

pub_date

1991-10-07 00:00:00

pages

87-91

issue

1

eissn

0014-5793

issn

1873-3468

pii

0014-5793(91)81110-T

journal_volume

291

pub_type

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