Document Detail

Binding kinetics of human cellular prion detection by DNA aptamers immobilized on a conducting polypyrrole.
MedLine Citation:
PMID:  23318762     Owner:  NLM     Status:  Publisher    
We developed a biosensor based on the surface plasmon resonance (SPR) method for the study of the binding kinetics and detection of human cellular prions (PrP(C)) using DNA aptamers as bioreceptors. The biosensor was formed by immobilization of various biotinylated DNA aptamers on a surface of conducting polypyrrole modified by streptavidin. We demonstrated that PrP(C) interaction with DNA aptamers could be followed by measuring the variation of the resonance angle. This was studied using DNA aptamers of various configurations, including conventional single-stranded aptamers that contained a rigid double-stranded supporting part and aptamer dimers containing two binding sites. The kinetic constants determined by the SPR method suggest strong interaction of PrP(C) with various DNA aptamers depending on their configuration. SPR aptasensors have a high selectivity to PrP(C) and were regenerable by a brief wash in 0.1 M NaOH. The best limit of detection (4 nM) has been achieved with this biosensor based on DNA aptamers with one binding site but containing a double-stranded supporting part.
A Miodek; A Poturnayová; M Snejdárková; T Hianik; H Korri-Youssoufi
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-15
Journal Detail:
Title:  Analytical and bioanalytical chemistry     Volume:  -     ISSN:  1618-2650     ISO Abbreviation:  Anal Bioanal Chem     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-15     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101134327     Medline TA:  Anal Bioanal Chem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
CNRS UMR-8182, Institut de Chimie Moléculaire et des Matériaux d'Orsay, Equipe de Chimie Bioorganique et Bioinorganique, Univ Paris-Sud, Bâtiment 420, 91405, Orsay, France.
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