Interpenetrating Cubes in the X-ray Crystallographic Structure of a Peptide Derived from Medin

Overview

Journal J Am Chem Soc

Publisher American Chemical Society

Specialty Chemistry

Date 2020 Aug 21

PMID 32816461

Citations 6

Authors

William J Howitz

Michal Wierzbicki

Rudy William Cabanela

Cindy Saliba

Ariana Motavalli

Ngoctran Tran

James S Nowick

Affiliations

Soon will be listed here.

Abstract

Amyloidogenic peptides and proteins are rich sources of supramolecular assemblies. Sequences derived from well-known amyloids, including Aβ, human islet amyloid polypeptide, and tau have been found to assemble as fibrils, nanosheets, ribbons, and nanotubes. The supramolecular assembly of medin, a 50-amino acid peptide that forms fibrillary deposits in aging human vasculature, has not been heavily investigated. In this work, we present an X-ray crystallographic structure of a cyclic β-sheet peptide derived from the 19-36 region of medin that assembles to form interpenetrating cubes. The edge of each cube is composed of a single peptide, and each vertex is occupied by a divalent metal ion. This structure may be considered a metal-organic framework (MOF) containing a large peptide ligand. This work demonstrates that peptides containing Glu or Asp that are preorganized to adopt β-hairpin structures can serve as ligands and assemble with metal ions to form MOFs.

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