Brain fodrin: substrate for calpain I, an endogenous calcium-activated protease.

Brain fodrin: substrate for calpain I, an endogenous calcium-activated protease.
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脑蛋白:钙蛋白酶 I(一种内源性钙激活蛋白酶)的底物。

DOI:
10.1073/pnas.81.11.3572
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发表时间:
1984
影响因子:
11.1
通讯作者:
Lynch,G
Lynch,G
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Siman,R;Baudry,M;Lynch,G

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钙激活的巯基蛋白酶钙蛋白酶I,这是存在于细胞溶质和膜制剂从大鼠大脑,进行了测试,其能力,以降低神经元血影蛋白样蛋白质fodrin。在微摩尔浓度的钙离子的存在下,纯化的钙蛋白酶I降解纯化的胞衬蛋白和海马和小脑膜中存在的胞衬蛋白。通过以下标准将胞衬蛋白鉴定为存在于脑膜中的高分子量蛋白:(i)在NaDodSO 4/聚丙烯酰胺凝胶上与纯化的胞衬蛋白共迁移,(ii)与纯化的胞衬蛋白的抗体的反应性,和(iii)钙蛋白酶活化后的蛋白水解图谱与钙蛋白酶介导的纯化的胞衬蛋白降解后发现的图谱相当。胞衬蛋白的分解是有选择性的,因为钙蛋白酶I不影响至少15种其他膜相关多肽。胞衬蛋白降解的蛋白酶是迅速的,并伴随着一个较低分子量的分解产物的外观。钙蛋白酶I对胞衬蛋白具有高亲和力,降解Km约为50 nM。纯化的钙蛋白酶I也降解纯化的血影蛋白和红细胞膜中存在的血影蛋白。钙蛋白酶I介导的血影蛋白样蛋白的降解可以提供一种机制,通过这种机制,细胞内游离钙水平的短暂增加可以改变膜下细胞骨架的结构和细胞表面受体的分布,并改变细胞形状。
The calcium-activated thiol-protease calpain I, which is present in cytosolic and membrane preparations from rat brain, was tested for its capacity to degrade the neuronal spectrin-like protein fodrin. In the presence of micromolar calcium concentrations purified calpain I degraded both purified fodrin and the fodrin present in hippocampal and cerebellar membranes. Fodrin was identified as a high molecular weight protein present in brain membranes by the following criteria: (i) comigration on NaDodSO4/polyacrylamide gels with purified fodrin, (ii) reactivity with antibodies to purified fodrin, and (iii) a proteolytic map following calpain activation comparable to that found after calpain-mediated degradation of purified fodrin. The fodrin breakdown was selective in that calpain I did not affect at least 15 other membrane-associated polypeptides. Fodrin degradation by the protease was rapid and was accompanied by the appearance of a lower molecular weight breakdown product. Calpain I had a high affinity for fodrin, with a Km for degradation of about 50 nM. Purified calpain I also degraded purified spectrin and the spectrin present in erythrocyte membranes. Calpain I-mediated degradation of spectrin-like proteins could provide a mechanism by which brief increases in intracellular free calcium levels modify the structure of the submembraneous cytoskeleton and the distribution of cell surface receptors and alter cell shape.
来自分离的肠刷状缘的 F-肌动蛋白和钙调蛋白结合蛋白具有与血影蛋白相关的形态
DOI: --
发表时间: 1982
期刊: Cell
影响因子: 64.5
作者:
J. Glenney;P. Glenney;M. Osborn;K. Weber
通讯作者: K. Weber
小脑中血影蛋白的红细胞和大脑形式:神经元中不同的膜细胞骨架结构域。
DOI: --
发表时间: 1983
期刊: Science
影响因子: 56.9
作者:
E. Lazarides;W. Nelson
通讯作者: W. Nelson
DOI: 10.1126/science.7015504
发表时间: 1981-01-01
期刊: SCIENCE
影响因子: 56.9
作者:
BAUDRY, M;BUNDMAN, MC;LYNCH, GS
通讯作者: LYNCH, GS
直接鉴定十二烷基硫酸钠凝胶中的特定糖蛋白和抗原。
DOI: --
发表时间: 1978
影响因子: --
作者:
K. Burridge
通讯作者: K. Burridge
胞质蛋白(皮质细胞质的一种成分)的重新分布伴随着细胞表面分子的加帽。
影响因子: 11.1
作者:
J. Levine;M. Willard
通讯作者: M. Willard