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Article

Interaction between a Novel Oligopeptide Fragment of the Human Neurotrophin Receptor TrkB Ectodomain D5 and the C-Terminal Fragment of Tetanus Neurotoxin

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Molecular Biology Department, Institut de Neruociènces and Biochemistry, Medicine Faculty, Universitat Autònoma de Barcelona (UAB), 08193 Barcelona, Spain
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Faculty of Chemical Sciences, BUAP, Puebla 72000, Mexico
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Peptide Specialities Laboratory, Im Neuenheimer Feld, Univerisity Campus, 69120 Heidelberg, Germany
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Center for Biomedical Research Network on Neurodegenerative Diseases (CIBERNED), 08193 Cerdanyola del Vallès, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Anthony S. Serianni
Molecules 2021, 26(13), 3988; https://doi.org/10.3390/molecules26133988
Received: 13 April 2021 / Revised: 20 May 2021 / Accepted: 26 May 2021 / Published: 30 June 2021
This article presents experimental evidence and computed molecular models of a potential interaction between receptor domain D5 of TrkB with the carboxyl-terminal domain of tetanus neurotoxin (Hc-TeNT). Computational simulations of a novel small cyclic oligopeptide are designed, synthesized, and tested for possible tetanus neurotoxin-D5 interaction. A hot spot of this protein-protein interaction is identified in analogy to the hitherto known crystal structures of the complex between neurotrophin and D5. Hc-TeNT activates the neurotrophin receptors, as well as its downstream signaling pathways, inducing neuroprotection in different stress cellular models. Based on these premises, we propose the Trk receptor family as potential proteic affinity receptors for TeNT. In vitro, Hc-TeNT binds to a synthetic TrkB-derived peptide and acts similar to an agonist ligand for TrkB, resulting in phosphorylation of the receptor. These properties are weakened by the mutagenesis of three residues of the predicted interaction region in Hc-TeNT. It also competes with Brain-derived neurotrophic factor, a native binder to human TrkB, for the binding to neural membranes, and for uptake in TrkB-positive vesicles. In addition, both molecules are located together in vivo at neuromuscular junctions and in motor neurons. View Full-Text
Keywords: clostridium neurotoxins; neurotrophin receptors; carboxyl-terminal domain of tetanus neurotoxin; brain-derived neurotrophic factor clostridium neurotoxins; neurotrophin receptors; carboxyl-terminal domain of tetanus neurotoxin; brain-derived neurotrophic factor
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MDPI and ACS Style

Candalija, A.; Scior, T.; Rackwitz, H.-R.; Ruiz-Castelan, J.E.; Martinez-Laguna, Y.; Aguilera, J. Interaction between a Novel Oligopeptide Fragment of the Human Neurotrophin Receptor TrkB Ectodomain D5 and the C-Terminal Fragment of Tetanus Neurotoxin. Molecules 2021, 26, 3988. https://doi.org/10.3390/molecules26133988

AMA Style

Candalija A, Scior T, Rackwitz H-R, Ruiz-Castelan JE, Martinez-Laguna Y, Aguilera J. Interaction between a Novel Oligopeptide Fragment of the Human Neurotrophin Receptor TrkB Ectodomain D5 and the C-Terminal Fragment of Tetanus Neurotoxin. Molecules. 2021; 26(13):3988. https://doi.org/10.3390/molecules26133988

Chicago/Turabian Style

Candalija, Ana, Thomas Scior, Hans-Richard Rackwitz, Jordan E. Ruiz-Castelan, Ygnacio Martinez-Laguna, and José Aguilera. 2021. "Interaction between a Novel Oligopeptide Fragment of the Human Neurotrophin Receptor TrkB Ectodomain D5 and the C-Terminal Fragment of Tetanus Neurotoxin" Molecules 26, no. 13: 3988. https://doi.org/10.3390/molecules26133988

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