Generation and Characterization of Anti-VGLUT Nanobodies Acting as Inhibitors of Transport.

TitleGeneration and Characterization of Anti-VGLUT Nanobodies Acting as Inhibitors of Transport.
Publication TypeJournal Article
Year of Publication2017
AuthorsSchenck, S., L. Kunz, D. Sahlender, E. Pardon, E. R. Geertsma, I. Savtchouk, T. Suzuki, Y. Neldner, S. Štefanić, J. Steyaert, A. Volterra, and R. Dutzler
JournalBiochemistry
Volume56
Issue30
Pagination3962-3971
Date Published2017 08 01
ISSN1520-4995
KeywordsAnimals, Biological Transport, Camelids, New World, Cells, Cultured, Central Nervous System Depressants, Cerebral Cortex, Embryo, Mammalian, Glutamic Acid, Green Fluorescent Proteins, HEK293 Cells, Humans, Membrane Transport Modulators, Mice, Models, Molecular, Nerve Tissue Proteins, Neurons, Peptide Library, Rats, Recombinant Fusion Proteins, Single-Domain Antibodies, Synaptic Transmission, Synaptic Vesicles, Vesicular Glutamate Transport Protein 1
Abstract

The uptake of glutamate by synaptic vesicles is mediated by vesicular glutamate transporters (VGLUTs). The central role of these transporters in excitatory neurotransmission underpins their importance as pharmacological targets. Although several compounds inhibit VGLUTs, highly specific inhibitors were so far unavailable, thus limiting applications to in vitro experiments. Besides their potential in pharmacology, specific inhibitors would also be beneficial for the elucidation of transport mechanisms. To overcome this shortage, we generated nanobodies (Nbs) by immunization of a llama with purified rat VGLUT1 and subsequent selection of binders from a phage display library. All identified Nbs recognize cytosolic epitopes, and two of the binders greatly reduced the rate of uptake of glutamate by reconstituted liposomes and subcellular fractions enriched with synaptic vesicles. These Nbs can be expressed as functional green fluorescent protein fusion proteins in the cytosol of HEK cells for intracellular applications as immunocytochemical and biochemical agents. The selected binders thus provide valuable tools for cell biology and neuroscience.

DOI10.1021/acs.biochem.7b00436
Alternate JournalBiochemistry
PubMed ID28731329
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