A modified enzyme-linked immunosorbent assay adapted for immunodetection of low amounts of water-insoluble proteins.
A mixture of thiourea, urea and CHAPS (TUC) is an excellent solvent compatible with isoelectrofocusing (IEF) separation of water-insoluble protein extracts, and their subsequent two-dimensional gel electrophoresis is an important step in proteomic studies. The main aim of this work was to quantify extremely low amounts of water-insoluble proteins contained, for instance, in samples collected in bio-aerosol samplers. High CHAPS concentrations solubilize many proteins. However, enzyme-linked immunosorbent assay (ELISA), which is the most popular immunodetection method of quantifying antigens, is unfortunately not compatible with these high CHAPS concentrations and with the low protein concentrations of TUC extracts. The most common mixture used to solubilize these proteins contains 2 mol l(-1) thiourea, 7 mol l(-1) urea and 5% w/v CHAPS. This paper shows that these components inhibit the adsorption and/or recognition of proteins on microtitration plates, preventing antigen quantification under classic ELISA conditions. We have tried several solvents (ethanol, isopropanol, acetonitrile and trichloroacetic acid) to make the TUC-soluble proteins stick to the ELISA plates, and ethanol was shown to be the most appropriate. In this study, we have defined a new ELISA protocol allowing rapid and sensitive detection of low concentrations (60-500 ng ml(-1)) of water-insoluble proteins extracted with high concentrations of TUC.
Godfrin
Dominique
D
Laboratoire Environnement et Chimie Analytique, Ecole Supérieure de Physique et Chimie Industrielles, 10, rue Vauquelin 75005 Paris, France. dominique.godfrin@espci.fr
Sénéchal
Hélène
H
Sutra
Jean-Pierre
JP
Busnel
Jean-Marc
JM
Desvaux
François-Xavier
FX
Peltre
Gabriel
G
D000818:Animals; D011232:Chemical Precipitation; D002793:Cholic Acids; D031745:Dactylis / Q000276:immunology / Q000378:metabolism; D003902:Detergents; D004797:Enzyme-Linked Immunosorbent Assay; D000431:Ethanol; D007124:Immunoenzyme Techniques; D007700:Kinetics; D010936:Plant Extracts / Q000276:immunology / Q000378:metabolism; D011058:Pollen / Q000276:immunology / Q000378:metabolism; D011506:Proteins / Q000032:analysis* / Q000276:immunology / Q000378:metabolism; D011817:Rabbits; D012995:Solubility; D013890:Thiourea; D014508:Urea; D014867:Water / Q000378:metabolism*
D002793:Cholic Acids; D003902:Detergents; D010936:Plant Extracts; D011506:Proteins; D014867:Water; D000431:Ethanol; D014508:Urea; D013890:Thiourea; C028213:3-((3-cholamidopropyl)dimethylammonium)-1-propanesulfonate