Methods, peptides and biosensors useful for detecting a...

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G01N 33/569 (2006.01) C12Q 1/04 (2006.01) C12Q 1/37 (2006.01)

Patent

CA 2557612

Described herein are methods of detecting a wound infection and for detecting the presence or absence of bacteria, for example, wound bacteria in a sample, by contacting a sample with a peptide substrate derived from the modification of the reactive site loop (RSL) domain of the .alpha. l- proteinase inhibitor. In the current invention, we have demonstrated that these peptide substrates without the alpha 1 protein can be efficiently used as peptide substrates. The modification or the absence of modification of this peptide substrate by the enzyme produced and/or secreted by the bacteria, can serve as an indicator for the presence or absence of the bacteria in the sample. The present invention also features a biosensor for detecting the presence or absence of bacteria in a sample.

L'invention concerne des méthodes de détection d'une infection de plaie et de détection de la présence ou de l'absence de bactéries, par exemple des bactéries de plaie dans un échantillon. Ces méthodes consistent à mettre en contact un échantillon et un substrat peptidique dérivé de la modification du domaine de la boucle de site réactif (RSL) de l'inhibiteur de la .alpha.1-protéinase. Ces substrats peptidiques, en l'absence de la protéine .alpha.1 peuvent être efficacement utilisés en tant que substrats peptidiques. La modification ou l'absence de modification de ce substrat peptidique par l'enzyme produit et/ou sécrété par des bactéries, peut servir d'indicateur pour la présence ou pour l'absence de ces bactéries dans l'échantillon. L'invention concerne également un biocapteur pour détecter la présence ou l'absence de bactéries dans un échantillon.

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