Characterization of the shark myelin Po protein.

Characterization of the shark myelin Po protein.
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DOI:
10.1159/000145717
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发表时间:
2008
影响因子:
1.7
通讯作者:
de Bellard, M. E.
de Bellard, M. E.
中科院分区:
心理学4区
文献类型:
--
作者:
Rotenstein, L.;Herath, K.;Gould, R. M.;de Bellard, M. E.

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髓鞘是由大量质膜包裹而成的绝缘鞘,它依赖于高度粘附的分子的存在,这些分子使膜的两侧保持紧密接触。Po糖蛋白(Po glycoprotein,Po)是哺乳动物外周神经系统(peripheral nervous system,PNS)髓鞘的主要成分。Po蛋白在髓磷脂进化中的确切作用尚不清楚,但一些系统发育观察指出它是髓磷脂作为多层膜结构发育的关键组成部分。鲨鱼出现在大约4亿年前的进化中,是第一个完全有髓鞘的生物。在这项研究中,我们着手研究鲨鱼髓鞘Po的表达模式,以了解它如何在中枢神经系统髓鞘的进化中发挥作用。我们发现鲨鱼有两种以上的同种型(32、28和25kD),其中一些可能没有完全功能,因为它们缺乏已知的Po嗜同性粘附结构域。
Myelin, the insulating sheath made by extensive plasma membrane wrappings is dependent on the presence of highly adhesive molecules that keep the two sides of the membrane in tight contact. The Po glycoprotein (Po) is the major component of the peripheral nervous system (PNS) myelin of mammals. The exact role that Po protein has played in the evolution of myelin is still unclear, but several phylogenetic observations point to it as a crucial component in the development of myelin as a multi-lamellar membrane structure. Sharks, which appeared in evolution about 400 million years ago, are the first fully myelinated organisms. In this study we set out to investigate the expression pattern of shark myelin Po as a way of understanding how it might have played a role in the evolution of myelin in the central nervous system. We found that shark have more than two isoforms (32, 28 and 25kD), and that some of these might not be fully functional because they lack the domains known for Po homophilic adhesion.
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发表时间: 2001-04-15
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