钠通道
生物
同源(生物学)
互补DNA
分子克隆
肽序列
基因
遗传学
氨基酸
克隆(编程)
门控
分子生物学
钠
化学
神经科学
有机化学
程序设计语言
计算机科学
作者
Alfred L. George,T. J. Knittle,Michael M. Tamkun
标识
DOI:10.1073/pnas.89.11.4893
摘要
Previously cloned voltage-dependent sodium channels exhibit a high degree of homology to one another and appear to comprise a single multigene family. We have now isolated and characterized cDNAs from both human adult heart and fetal skeletal muscle that encode a sodium channel alpha subunit that exhibits only moderate primary structure identity with other sodium channels and is prominently expressed in both heart and uterus. The approximately 7.2-kilobase cDNA sequence, designated hNav2.1, predicts a 1682-amino acid protein that bears 52%, 49%, and 46% overall identity with sodium channels cloned from rat brain, skeletal muscle, and heart, respectively. Positively charged S4 segments are present in hNav2.1, but there are fewer basic residues in repeat domains 1, 3, and 4 than in other cloned sodium channels. The cloning of hNav2.1 provides evidence for greater evolutionary divergence among voltage-dependent sodium channels and suggests that other sodium channel gene subfamilies may exist. The unique amino acid sequences in regions known to be involved in voltage-dependent activation and inactivation suggest that hNav2.1 will have novel gating properties.
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