NDLI: Antibiotic gold: tethering of antimicrobial peptides to gold nanoparticles maintains conformational flexibility of peptides and improves trypsin susceptibility

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Biomaterials Science Vol - 5 Issue - 3

Biomaterials Science Vol - 5 Issue - 2

Biomaterials Science Vol - 5 Issue - 1

Biomaterials Science Vol -4

Biomaterials Science Vol -3

Biomaterials Science Vol -2

Biomaterials Science Vol -1

Antibiotic gold: tethering of antimicrobial peptides to gold nanoparticles maintains conformational flexibility of peptides and improves trypsin susceptibility

Content Provider	Royal Society of Chemistry (RSC)
Author	Heidenreich, Nico Wadhwani, Parvesh Ulrich, Anne S. Podeyn, Benjamin Bürck, Jochen
Copyright Year	2017
Abstract	Peptide-coated nanoparticles are valuable tools for diverse biological applications, such as drug delivery, molecular recognition, and antimicrobial action. The functionalization of pre-fabricated nanoparticles with free peptides in solution is inefficient either due to aggregation of the particles or due to the poor ligand exchange reaction. Here, we present a one-pot synthesis for preparing gold nanoparticles with a homogeneous distribution that are covered in situ with cationic peptides in a site-selective manner via Cys-residue at the N-terminus. Five representative peptides were selected, which are known to perturb cellular membranes and exert their antimicrobial and/or cell penetrating activity by folding into amphiphilic α-helical structures. When tethered to the nanoparticles at a single site, all peptides were found to switch their conformation from unordered state (in aqueous buffers) to their functionally relevant α-helical conformation in the presence of model membranes, as shown by circular dichroism spectroscopy. The conjugated peptides also maintained the same antibacterial activity as in the free form. Most importantly, when tethered to the gold nanoparticles the peptides showed an enormous increase in stability against trypsin digestion compared to the free forms, leading to a dramatic improvement of their lifetimes and activities. These findings suggest that site-selective surface tethering of peptides to gold nanoparticles has several advantages: (i) it does not prevent the peptides from folding into their biologically active conformation, (ii) such conjugation protects the peptides against protease digestion, and (iii) this way it is possible to prepare stable, water soluble antimicrobial nanoparticles as promising antibacterial agents.
Starting Page	817
Ending Page	827
Page Count	11
File Format	HTM / HTML PDF
ISSN	20474830
Volume Number	5
Issue Number	4
Journal	Biomaterials Science
DOI	10.1039/c7bm00069c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Antimicrobial One-pot synthesis N-terminus Spectroscopy Trypsin Ligand Protease Amphiphile Drug delivery Base pair Protein structure Circular dichroism
Content Type	Text
Resource Type	Article
Subject	Materials Science Biomedical Engineering

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