The Prosegments of Furin and PC7 as Potent Inhibitors of Proprotein Convertases

The Prosegments of Furin and PC7 as Potent Inhibitors of Proprotein Convertases
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Furin 和 PC7 的组合作为前蛋白转化酶的有效抑制剂

DOI:
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发表时间:
1999
影响因子:
4.8
通讯作者:
N. Seidah
N. Seidah
中科院分区:
生物学2区
文献类型:
--
作者:
Mei Zhong;J. S. Munzer;A. Basak;S. Benjannet;S. Mowla;E. Decroly;M. Chrétien;N. Seidah

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枯草杆菌蛋白酶/kexin家族的所有前蛋白转化酶(PC)都含有一个N-末端前片段,据推测该片段既作为分子内伴侣又作为其亲本酶的抑制剂。在这项工作中,我们检查了纯化的重组细菌弗林蛋白酶前片段和PC 7对荧光肽pERTKR-MCA或人类免疫缺陷病毒包膜糖蛋白gp 160的体外加工的抑制作用。这些前肽是对特定前蛋白转化酶显示可测量的选择性的有效抑制剂。小的,合成的十肽衍生自C末端的prosegments也是有效的抑制剂,虽然不如全长蛋白质,和C-末端P1精氨酸是必不可少的抑制。细菌,重组prosegments也被用来产生特定的抗血清,使我们能够研究通过牛痘病毒构建体表达的弗林蛋白酶和PC 7的prosegments的细胞内代谢命运。这些重组痘苗病毒,沿着furin和PC 7的前原片段的瞬时转染子,有效地抑制神经营养因子神经生长因子和脑源性神经营养因子的离体加工。因此,我们已经证明了第一次,PC prosegments,作为独立的结构域表达离体,可以反式抑制前体细胞内的PC成熟。
All proprotein convertases (PCs) of the subtilisin/kexin family contain an N-terminal prosegment that is presumed to act both as an intramolecular chaperone and an inhibitor of its parent enzyme. In this work, we examined inhibition by purified, recombinant bacterial prosegments of furin and PC7 on the in vitro processing of either the fluorogenic peptide pERTKR-MCA or the human immunodeficiency virus envelope glycoprotein gp160. These propeptides are potent inhibitors that display measurable selectivity toward specific proprotein convertases. Small, synthetic decapeptides derived from the C termini of the prosegments are also potent inhibitors, albeit less so than the full-length proteins, and the C-terminal P1 arginine is essential for inhibition. The bacterial, recombinant prosegments were also used to generate specific antisera, allowing us to study the intracellular metabolic fate of the prosegments of furin and PC7 expressed via vaccinia virus constructs. These vaccinia virus recombinants, along with transient transfectants of the preprosegments of furin and PC7, efficiently inhibited theex vivo processing of the neurotrophins nerve growth factor and brain-derived neurotrophic factor. Thus, we have demonstrated for the first time that PC prosegments, expressed ex vivo as independent domains, can act in trans to inhibit precursor maturation by intracellular PCs.
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发表时间: 1994-01-01
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作者:
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DOI: --
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影响因子: --
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