Posgrado en Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Ciudad de México 04510, Mexico.
Laboratorio de Neurofarmacología Marina, Departamento de Neurobiología Celular y Molecular, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Querétaro 76230, Mexico.
Toxins (Basel). 2022 Jul 26;14(8):510. doi: 10.3390/toxins14080510.
We isolated a new dimeric conotoxin with inhibitory activity against neuronal nicotinic acetylcholine receptors. Edman degradation and transcriptomic studies indicate a homodimeric conotoxin composed by two chains of 47 amino acid in length. It has the cysteine framework XX and 10 disulfide bonds. According to conotoxin nomenclature, it has been named as αD-FrXXA. The αD-FrXXA conotoxin inhibited the ACh-induced response on nAChR with a IC of 125 nM on hα7, 282 nM on hα3β2, 607 nM on α4β2, 351 nM on mouse adult muscle, and 447 nM on mouse fetal muscle. This is first toxin characterized from and, at the same time, the second αD-conotoxin characterized from a species of the Eastern Pacific.
我们分离出一种具有抑制烟碱型乙酰胆碱受体活性的新型二聚型芋螺毒素。Edman 降解和转录组学研究表明,它是由两条 47 个氨基酸组成的同源二聚体。它具有 XX 型半胱氨酸框架和 10 个二硫键。根据芋螺毒素命名法,它被命名为αD-FrXXA。αD-FrXXA 芋螺毒素对 hα7 的 ACh 诱导反应的抑制作用的 IC 为 125 nM,对 hα3β2 的抑制作用的 IC 为 282 nM,对α4β2 的抑制作用的 IC 为 607 nM,对成年鼠肌肉的抑制作用的 IC 为 351 nM,对胎鼠肌肉的抑制作用的 IC 为 447 nM。这是首次从 和中分离得到的毒素,同时也是首次从东太平洋的一个物种中分离得到的第二种αD-芋螺毒素。