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Three Types of Muscles Express Three Sodium-Calcium Exchanger Isoforms

机译:三种类型的肌肉表达三种钠钙交换剂同种型

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The sodium-calcium exchanger (NCX) of plasma membrane is expressed in any animal cell. The specific role of its three isoforms (NCX1-3) is not yet established. Their levels vary considerably during murine postnatal development. In particular, in skeletal muscle, NCX1 expression decreases gradually upon aging while reciprocal changes take place for NCX3. NCX2 expression is restricted to brain and smooth muscles. The data on SDS-gel mobility shifts indicate that all three isoforms undergo Ca~(2+)-dependent conformational changes, and that an exchanger regulatory Ca~(2+)-binding domain interacts directly with mutually exclusive exons A and B inducing two different NCX1 conformations.
机译:质膜的钠钙交换剂(NCX)在任何动物细胞中表达。其三种同种型(NCX1-3)的具体作用尚未建立。在鼠疫后期发育期间,他们的水平随着差异而变化。特别是,在骨骼肌中,衰老时NCX1表达逐渐降低,而NCX3的互核变化发生。 NCX2表达仅限于脑和平滑肌。 SDS-GEL移动性移位的数据表明,所有三种同种型都会经历CA〜(2 +) - 依赖性构象变化,并且交换器调节CA〜(2 +) - 绑定结构域直接与互动两个和B诱导两个相互作用不同的ncx1构象。

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