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首页> 外文期刊>Trends in Neurosciences >Ion channels as enzymes: analogy or homology?
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Ion channels as enzymes: analogy or homology?

机译:离子通道作为酶:类比还是同源?

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摘要

Ion channels render nerve and muscle excitable. A typical channel protein can mediate the passive transfer of millions of ions per second across the membrane. Thus, channels catalyse the transmembrane flux of ions, fulfilling criteria traditionally associated with enzymes. Is this a semantic coincidence, or do channels and enzymes in fact rely upon similar structural principles? A general answer remains elusive given the paucity of crystallographic data on channels. Nevertheless, emerging evidence points to fundamental similarities between the pores of channels and the active sites of enzymes of resolved structure. Shared features include narrow clefts lined by protein loops, and specific binding of transition intermediates during catalysis. The often cited analogies between channels and enzymes might therefore reflect basic design homologies.
机译:离子通道使神经和肌肉兴奋。典型的通道蛋白可以介导每秒穿过膜的数百万个离子的被动转移。因此,通道可催化离子的跨膜通量,满足传统上与酶相关的标准。这是语义上的巧合,还是通道和酶实际上依赖于相似的结构原理?由于通道上的晶体学数据很少,所以一般的答案仍然难以捉摸。然而,新出现的证据表明通道的孔与分解结构的酶的活性位点之间基本相似。共有的特征包括由蛋白环衬砌的狭窄裂口,以及催化过程中过渡中间体的特异性结合。因此,经常引用的通道和酶之间的类比可能反映了基本的设计同源性。

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