Neuroendocrine protein 7B2 is essential for proteolytic conversion and activation of proprotein convertase 2 in vivo.

Neuroendocrine protein 7B2 is essential for proteolytic conversion and activation of proprotein convertase 2 in vivo.
复制标题

神经内分泌蛋白 7B2 对于体内蛋白水解酶 2 的蛋白水解转化和激活至关重要。

DOI:
10.1089/dna.1998.17.1017
复制
发表时间:
1998
影响因子:
3.1
通讯作者:
Day,R
Day,R
中科院分区:
生物学4区
文献类型:
--
作者:
Seidel,B;Dong,W;Savaria,D;Zheng,M;Pintar,JE;Day,R

文献摘要

参考文献

被引文献

相似文献

7 B2蛋白广泛分布于神经和内分泌组织中。它的生物学功能被发现与加工酶前蛋白转化酶2(PC 2)有关,PC 2是一种哺乳动物枯草杆菌蛋白酶/kexin样内切蛋白酶,可在特定的单个或多个碱性氨基酸残基处切割。为了在活体模型中检验7 B2对PC 2的拟议功能,我们首先比较了7 B2和PC 2 mRNA在大鼠脑中的分布。7 B2 mRNA的表达被认为是泛神经元,但另外,我们观察到7 B2 mRNA在室管膜细胞和连合下器官。虽然PC 2 mRNA的表达是专门的神经元,它是更受限制的,保留一些地区表达高水平的7 B2。这一发现表明,7 B2在非PC 2表达细胞中具有额外的功能。在成年大鼠脑中未获得PC 2阳性/7 B2阴性细胞的证据。然而,在发育中的大鼠脑(E17)中,这些区域很容易观察到,显示出较高水平的pro-PC 2(75 kD)。类似地,在胰岛素诱导的低血糖休克的动物模型中,其中肾上腺髓质7 B2表达降低,观察到前PC 2与成熟PC 2的比率(75 kD:68 kD)增加。最后,人神经上皮瘤SK-N-MCIXC表达PC 2,但不表达7 B2。因此,仅观察到无活性的pro-PC 2形式:75-kD细胞内和71-kD细胞外。在用27-kD pro-7 B2稳定转染SK-N-MCIXC细胞后,成熟且有活性的(68-kD)PC 2分泌到培养基中。我们的数据表明,7 B2在体内的蛋白水解转化和激活的PC 2的关键作用。
The 7B2 protein is widely distributed in neural and endocrine tissues. Its biological function was found to be related to the processing enzyme proprotein convertase 2 (PC2), a mammalian subtilisin/kexin-like endoproteinase that cleaves at specific single or multiple basic amino-acid residues. In order to examine the proposed function of 7B2 on PC2 inin vivomodels, we first compared the distribution of 7B2 and PC2 mRNAs in the rat brain. Expression of 7B2 mRNA was found to be pan-neuronal, but additionally, we observed 7B2 mRNA in ependymal cells and in the subcommissural organ. Although the expression of PC2 mRNA was exclusively neuronal, it was more restricted, sparing some regions expressing high levels of 7B2. This finding suggests that 7B2 has an additional function in non-PC2-expressing cells. No evidence of PC2-positive/7B2-negative cells could be obtained in the adult rat brain. However, in the developing rat brain (E17), such regions were easily observed, showing higher levels of pro-PC2 (75 kD). Similarly, in the animal model of insulin-induced hypoglycemic shock, where adrenomedullary 7B2 expression is decreased, the ratio of pro-PC2 to mature PC2 (75 kD:68 kD) was observed to be increased. Finally, the human neuroepithelioma SK-N-MCIXC expresses PC2 but not 7B2. Accordingly, only inactive pro-PC2 forms were observed: 75-kD intracellular and 71-kD extracellular. After stable transfection of SK-N-MCIXC cells with 27-kD pro-7B2, mature and active (68-kD) PC2 was secreted into the medium. Our data demonstrate a critical role of 7B2 in the proteolytic conversion and activation of PC2in vivo.
新型垂体多肽 7B2 是一种与阿黑皮素原共表达的高度保守蛋白。
DOI: --
发表时间: 1989
期刊: European Journal of Biochemistry
影响因子: --
作者:
G. Martens;M. Bussemakers;T. Ayoubi;B. Jenks
通讯作者: B. Jenks
DOI: 10.1210/mend-5-12-2014
发表时间: 1991-12-01
影响因子: --
作者:
BLOOMQUIST, BT;EIPPER, BA;MAINS, RE
通讯作者: MAINS, RE
神经内分泌蛋白7B2 mRNA在小鼠和大鼠垂体中的表达。
DOI: --
发表时间: 1993
期刊: Neuroendocrinology
影响因子: 4.1
作者:
M. Marcinkiewicz;P. Touraine;M. Mbikay;M. Chrétien
通讯作者: M. Chrétien
通过交替剪接产生一个密码子不同的两个 mRNA 可能是人类神经内分泌蛋白 7B2 基因表达的固有特性。
DOI: 10.1016/0006-291x(91)90499-w
发表时间: 1991
影响因子: 3.1
作者:
L. Paquet;C. Lazure;N. Seidah;M. Chrétien;M. Mbikay
通讯作者: M. Mbikay
新型垂体蛋白“7B2”的中枢神经系统分布:分泌和突触小泡的定位
DOI: --
发表时间: 1986
期刊: Brain Research
影响因子: 2.9
作者:
M. Marcinkiewicz;S. Benjannet;M. Cantin;N. Seidah;M. Chre´tien
通讯作者: M. Chre´tien