Plates-formes PFRN

Accueil > Bibliographie > Affinity biosensors using recombinant native membrane proteins displayed on (...)

Affinity biosensors using recombinant native membrane (...)

Sci Rep. 2017 Apr ;7(1):1032
Affinity biosensors using recombinant native membrane proteins displayed on exosomes : application to botulinum neurotoxin B receptor.
Desplantes R, Leveque C, Muller B, Lotierzo M, Ferracci G, Popoff M, Seagar M, Mamoun R, El Far O.

The development of simple molecular assays with membrane protein receptors in a native conformation still represents a challenging task. Exosomes are extracellular vesicles which, due to their stability and small size, are suited for analysis in various assay formats. Here, we describe a novel approach to sort recombinant fully native and functional membrane proteins to exosomes using a targeting peptide. Specific binding of high affinity ligands to the potassium channel Kv1.2, the G-protein coupled receptor CXCR4, and the botulinum neurotoxin type B (BoNT/B) receptor, indicated their correct assembly and outside out orientation in exosomes. We then developed, using a label-free optical biosensor, a new method to determine the kinetic constants of BoNT/B holotoxin binding to its receptor synaptotagmin2/GT1b ganglioside (kon = 2.3 ×10(5) M(-1).s(-1), koff = 1.3 10(-4) s(-1)), yielding an affinity constant (KD = 0.6 nM) similar to values determined from native tissue. In addition, the recombinant binding domain of BoNT/B, a potential vector for neuronal delivery, bound quasi-irreversibly to synaptotagmin 2/GT1b exosomes. Engineered exosomes provide thus a novel means to study membrane proteins for biotechnology and clinical applications.


    Ils nous font confiance

  • logo amu
  • logo cnrs
  • logo inserm
  • logo AP-HM
  • logo F�d�ration pour la Recherche sur le Cerveau
  • logo Fondation pour la Recherche Medical en France
  • logo IBiSA
  • logo Europe programme FEDER
  • logo Agence Nationale de la Recherche
  • logo Plateforme Technologique Aix-Marseille
  • logo Vect-Horus
  • logo Neuron Experts