Towards the protein phosphatase-based biosensors for microcystins detection

Dorota Szydlowska 1,2Monica Campas 2Marek Trojanowicz 1Jean-Louis Marty 2

1. Warsaw University, Faculty of Chemistry, Pasteura 1, Warszawa 02-093, Poland
2. Centre de Phitopharmacie, Universite Perpignan, Perpignan, France

Abstract

Microcystins are cyclic heptapeptides, composed of five permanently occurring and two variable amino acids. The toxicity of microcystins is associated to the inhibition of the serie/threonine protein phosphatases type 1 (PP1) and 2A (PP2A), enzymem that play an important role in the dephosphorylation of intracellular proteins. Thein inhibitionh in the liver implies hyperphosphorylation of the cytoskeletal filaments, hepatocyte determination and subsequent tumor formation. In order to assure the water quality and the public health, the WHO (World Health Organization) has recommended a maximum level of 1 µg/L of most commonly fund microcystin-LR in drinking water. The strong toxicity of microcystins makes necessary the development of fast, sensitive and reliable methods to detect them. The enzymatic approach based on the PP inhibition informs about the toxicology and is highly sensitive. Electrochemistry has been widely used in biosensors because but it has not been exploited neither for the detection of protein phosphatase inhibition by microcystins. We propose new strategy for the electrochemical monitoring of microcystin in water. The enzymatic approach is based on the inhibition of protein phosphatase (type 2A) by microcystins. The enzyme has been immobilised on the screen-printed working electrode surface by encapsulation with polyvinyl alcohol bearing styrylpyridium groups (PVA-SbQ). Immobilisation conditions have been optimised by colorimetry. The electrochemical transduction has been achived by using a new designed enzyme substrate, catechyl monophosphate, wich is electrochemically active only after dephosphorylation by the non-inhibited enzyme. This bioelectrochemical sensing strategy have led to development of amperometric biosensors for water quality assessment.

Legal notice
  • Legal notice:

    Copyright (c) Pielaszek Research, all rights reserved.
    The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
    In every case, proper references including Author(s) name(s) and URL of this webpage: http://science24.com/paper/4851 must be provided.

 

Related papers
  1. Design of a highly sensitive electrochemical biosensor for methyl mercaptan detection
  2. Detection chlorpyrifos oxon using screan-printed electrodes with difference acetylocholinesterases
  3. Enantioselective amperometric screen-printed biosensor with d-amino acid oxidase for determination of d-alanine in food
  4. Studies of New Procedures for Sensors and Biosensors Development Based on Modified Gold and Platinum Supports

Presentation: Poster at SMCBS'2005 Workshop, by Dorota Szydlowska
See On-line Journal of SMCBS'2005 Workshop

Submitted: 2005-09-21 12:19
Revised:   2009-06-07 00:44
Google
 
Web science24.com
© 1998-2021 pielaszek research, all rights reserved Powered by the Conference Engine