The fabrication and notably improved performance of composite electrodes based on modified self-assembled diphenylalanine peptide nanotubes is described. Peptide nanotubes were attached to gold electrodes, and we studied the resulting electrochemical behavior using cyclic voltammetry and chronoamperometry. The peptide nanotube-based electrodes demonstrated a direct and unmediated response to hydrogen peroxide and NADH at a potential of +0.4 V (vs SCE). This biosensor enables a sensitive determination of glucose by monitoring the hydrogen peroxide produced by an enzymatic reaction between the glucose oxidase attached to the peptide nanotubes and glucose. In addition, the marked electrocatalytic activity toward NADH enabled a sensitive detection of ethanol using ethanol dehydrogenase and NAD+. The peptide nanotube-based amperometric biosensor provides a potential new tool for sensitive biosensors and biomolecular diagnostics.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/ac050414g | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Advances in cyclotide research: bioactivity to cyclotide-based therapeutics.
Mol Divers
January 2025
Department of Microbiology, Maharshi Dayanand University, Rohtak, Haryana, 124001, India.
Cyclotides are a class of plant-derived cyclic peptides having a distinctive structure with a cyclic cystine knot (CCK) motif. They are stable molecules that naturally play a role in plant defense. Till date, more than 750 cyclotides have been reported among diverse plant taxa belonging to Cucurbitaceae, Violaceae, Rubiaceae, Solanaceae, and Fabaceae.
View Article and Find Full Text PDFMechanistic Analysis of Peptide Affinity to Single-Walled Carbon Nanotubes and Volatile Organic Compounds Using Chemiresistors.
ACS Appl Mater Interfaces
January 2025
Air Force Research Laboratory, 711th Human Performance Wing, Wright-Patterson Air Force Base, Wright-Patterson AFB, Ohio 45433, United States.
Peptides, due to their diverse and controllable properties, are used as both liquid and gas phase recognition elements for both biological and chemical targets. While it is well understood how binding of a peptide to a biomolecule can be converted into a sensing event, there is not the same mechanistic level of understanding with regard to how peptides modulate the selectivity of semiconductor/conductor-based gas sensors. Notably, a rational, mechanistic study has not yet been performed to correlate peptide properties to the sensor response for volatile organic compounds (VOCs) as a function of chemical properties.
View Article and Find Full Text PDFpH-Responsive nanotubes from asymmetric cyclic peptide-polymer conjugates.
Chem Sci
January 2025
Department of Chemistry, University of Warwick Coventry CV4 7AL UK
Self-assembling cyclic peptide nanotubes are fascinating supramolecular systems with promising potential for various applications, such as drug delivery, transmembrane ionic channels, and artificial light-harvesting systems. In this study, we present novel pH-responsive nanotubes based on asymmetric cyclic peptide-polymer conjugates. The pH response is introduced by a tertiary amine-based polymer, poly(dimethylamino ethyl methacrylate) (pDMAEMA) or poly(diethylamino ethyl methacrylate) (pDEAEMA) which is protonated at low pH.
View Article and Find Full Text PDFEngineering the Self-Assembly Pathways of POSS-Peptide Amphiphiles to Form Diverse Cross-β Structures.
Angew Chem Int Ed Engl
December 2024
South China Advanced Institute for Soft Matter Science and Technology, School of Emergent Soft Matter, South China University of Technology, Guangzhou, 510640, China.
Cross-β structures are crucial in driving protein folding and aggregation. However, due to their strong aggregating tendency, the precise control of the self-assembly of β-sheet-forming peptides remains a challenge. We propose a molecular geometry strategy to study and control the self-assembly of cross-β structures.
View Article and Find Full Text PDFMultifunctional cyclic biomimetic peptides: Self-assembling nanotubes for effective treatment of sepsis.
Int J Biol Macromol
February 2025
Department of Emergency Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China. Electronic address:
Antibiotic abuse has led to an increasingly serious risk of antimicrobial resistance, developing alternative antimicrobials to combat this alarming issue is urgently needed. Rhesus theta defensin-1 (RTD-1) is a theta-defensin contributing to broad-spectrum bactericidal activity via the mechanisms of membrane perturbation. Intriguingly, human defensin-6 (HD6), an enteric defensin secreted by Paneth cells without direct bactericidal effect, could self-assembled into fibrous networks to trap enteric pathogens for assistance of innate immunity.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!