Selenoprotein P-expression, functions, and roles in mammals.

Selenoprotein P-expression, functions, and roles in mammals.
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DOI:
10.1016/j.bbagen.2009.03.026
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发表时间:
2009-11
影响因子:
3
通讯作者:
Hill, Kristina E.
Hill, Kristina E.
中科院分区:
生物学3区
文献类型:
--
作者:
Burk, Raymond F.;Hill, Kristina E.

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硒蛋白 P (Sepp1) 是一种由 2 个结构域组成的分泌蛋白。较大的 N 端结构域在氧化还原基序中包含 1 个硒代半胱氨酸残基,较小的 C 端结构域包含其他 9 个硒代半胱氨酸。存在不同长度的 Sepp1 同工型,但尚未实现对它们的定量。 Sepp1 的肝脏合成影响全身硒含量,肝脏是大多数血浆 Sepp1 的来源。 ApoER2 是脂蛋白受体家族的一员,它与 Sepp1 结合,促进其被睾丸吸收并被大脑保留。 Megalin 是另一种脂蛋白受体,有助于将过滤后的 Sepp1 摄取到肾脏的近端小管细胞中。因此,Sepp1 负责硒的稳态和分配。与野生型小鼠相比,Sepp1 缺失的小鼠因感染刚果锥虫而遭受更高的发病率和死亡率。仅表达Sepp1 N端结构域的小鼠与野生型小鼠具有相同的疾病严重程度,表明Sepp1针对感染的保护功能存在于N端(氧化还原)结构域。因此,Sepp1具有多种功能。此外,缺硒时血浆Sepp1浓度下降,因此可以作为硒营养状况的指标。
Selenoprotein P (Sepp1) is a secreted protein that is made up of 2 domains. The larger N-terminal domain contains 1 selenocysteine residue in a redox motif and the smaller C-terminal domain contains the other 9 selenocysteines. Sepp1 isoforms of varying length occur but quantitation of them has not been achieved. Hepatic synthesis of Sepp1 affects whole-body selenium content and the liver is the source of most plasma Sepp1. ApoER2, a member of the lipoprotein receptor family, binds Sepp1 and facilitates its uptake into testis and retention of its selenium by the brain. Megalin, another lipoprotein receptor, facilitates uptake of filtered Sepp1 into proximal tubule cells of the kidney. Thus, Sepp1 serves in homeostasis and distribution of selenium. Mice with deletion of Sepp1 suffer greater morbidity and mortality from infection with Trypanosoma congolense than do wild-type mice. Mice that express only the N-terminal domain of Sepp1 have the same severity of illness as wild-type mice, indicating that the protective function of Sepp1 against the infection resides in the N-terminal (redox) domain. Thus, Sepp1 has several functions. In addition, plasma Sepp1 concentration falls in selenium deficiency and, therefore, it can be used as an index of selenium nutritional status.
DOI: 10.1016/0167-4838(94)90014-0
发表时间: 1994-02-16
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影响因子: --
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发表时间: 2006-12-01
影响因子: 3
作者:
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