XB-ART-59435
Toxins (Basel)
2022 Oct 11;1410:. doi: 10.3390/toxins14100697.
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Nicotinic Acetylcholine Receptors Are Novel Targets of APETx-like Toxins from the Sea Anemone Heteractis magnifica.
Kalina RS
,
Kasheverov IE
,
Koshelev SG
,
Sintsova OV
,
Peigneur S
,
Pinheiro-Junior EL
,
Popov RS
,
Chausova VE
,
Monastyrnaya MM
,
Dmitrenok PS
,
Isaeva MP
,
Tytgat J
,
Kozlov SA
,
Kozlovskaya EP
,
Leychenko EV
,
Gladkikh IN
.
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The nicotinic acetylcholine receptors (nAChRs) are prototypical ligand-gated ion channels, provide cholinergic signaling, and are modulated by various venom toxins and drugs in addition to neurotransmitters. Here, four APETx-like toxins, including two new toxins, named Hmg 1b-2 Metox and Hmg 1b-5, were isolated from the sea anemone Heteractis magnifica and characterized as novel nAChR ligands and acid-sensing ion channel (ASIC) modulators. All peptides competed with radiolabeled α-bungarotoxin for binding to Torpedo californica muscle-type and human α7 nAChRs. Hmg 1b-2 potentiated acetylcholine-elicited current in human α7 receptors expressed in Xenopus laevis oocytes. Moreover, the multigene family coding APETx-like peptides library from H. magnifica was described and in silico surface electrostatic potentials of novel peptides were analyzed. To explain the 100% identity of some peptide isoforms between H. magnifica and H. crispa, 18S rRNA, COI, and ITS analysis were performed. It has been shown that the sea anemones previously identified by morphology as H. crispa belong to the species H. magnifica.
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