JoVE Encyclopedia of Experiments
Biologische Technieken
0 weergaven • 4:43 min • July 8th, 2025
To begin the β-lactamase-based conductimetric biosensor assay, take a transducer chip with working, counter, and reference electrodes. The working electrode has a conductive polymer coating, facilitating target antigen immobilization. The reference and counter electrodes lack this polymer coating.
Add a solution containing the target antigen onto the chip. Incubate. The antigen gets immobilized on the working electrode surface via non-covalent interactions. Wash to remove unbound antigens.
Add a blocking solution. Proteins in the solution attach to unbound sites on the working electrode and block them.
Add a bifunctional chimeric protein to the chip to detect the immobilized antigen. The chimeric protein comprises a β-lactamase enzyme — a bacterial protein responsible for antibiotic resistance. The enzyme is fused to a nanobody — the N-terminal variable region of single-domain antibodies.
Upon incubation, the nanobody of the protein binds to the immobilized target antigen. Wash to remove unbound chimeric proteins.
Plug the chip into a computer-controlled digital multimeter. Add a detection solution containing the antibiotic benzylpenicillin — a substrate for β-lactamase.
Benzylpenicillin binds to the β-lactamase of the antigen-bound chimeric protein and gets hydrolyzed — causing the release of protons. The protons induce a change in the electrical conductance of the polymer.
Plot the real-time difference in conductance between the reference electrode and the working electrode with the immobilized target antigen, confirming its interaction with the chimeric protein.
To begin the β-lactamase-based conductimetric biosensor assay, take a transducer chip with working, counter, and reference electrodes. The working electrode has a conductive polymer coating, facilitating target antigen immobilization. The reference and counter electrodes lack this polymer coating.
Add a solution containing the target antigen onto the chip. Incubate. The antigen gets immobilized on the working electrode surface via non-covalent interactions. Wash to remove unbound antigens.
Add a blocking solution. Proteins in the solution attach to unbound sites on the working electrode and block them.
Add a bifunctional chimeric protein to the chip to detect the immobilized antigen. The chimeric protein comprises a β-lactamase enzyme — a bacterial protein responsible for antibiotic resistance. The enzyme is fused to a nanobody — the N-terminal variable region of single-domain antibodies.
Upon incubation, the nanobody of the protein binds to the immobilized target antigen. Wash to remove unbound chimeric proteins.
Plug the chip into a computer-controlled digital multimeter. Add a detection solution containing the antibiotic benzylpenicillin — a substrate for β-lactamase.
Benzylpenicillin binds to the β-lactamase of the antigen-bound chimeric protein and gets hydrolyzed — causing the release of protons. The protons induce a change in the electrical conductance of the polymer.
Plot the real-time difference in conductance between the reference electrode and the working electrode with the immobilized target antigen, confirming its interaction with the chimeric protein.
Dit artikel beschrijft een conductimetrische biosensoranalyse op basis van β-lactamase voor het detecteren van doelantigenen. De methode maakt gebruik van een transducerchip met elektroden om veranderingen in de elektrische geleidbaarheid bij interactie met het antigeen te meten.
Deze conductimetrische biosensor-assay maakt real-time, labelvrije detectie van eiwit-eiwitinteracties mogelijk via meetbare veranderingen in de elektrische geleidbaarheid. Het ondersteunt vroege targetvalidatie door kwantitatieve, reproduceerbare uitslagen te leveren die mechanische ambiguïteit in antilichaam-antigeenbindingsstudies verminderen. De compatibiliteit van de assay met transducer-chips en digitale uitleessystemen positioneert het als een schaalbare tool voor discovery biology-workflows waarin functionele bevestiging van biomoleculaire interacties vereist is.
De assay past binnen het ontdekkingscontinuüm van targetvalidatie tot leadoptimalisatie, waarbij functionele bevestiging van binding voorafgaat aan downstream effectiviteits- en veiligheidsprofielschetsing.
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Laatst bijgewerkt: 29 augustus 2026