Biogenesis and proteolytic processing of lysosomal DNase II.

Biogenesis and proteolytic processing of lysosomal DNase II.
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DOI:
10.1371/journal.pone.0059148
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Uchiyama Y
Uchiyama Y
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Ohkouchi S;Shibata M;Sasaki M;Koike M;Safig P;Peters C;Nagata S;Uchiyama Y

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脱氧核糖核酸酶 II (DNase II) 是凋亡细胞核 DNA 吞噬消化过程中的关键酶。为了了解 DNase II 的分子特性,特别是加工过程,我们制备了针对小鼠 DNase II 羧基末端序列的多克隆抗体。在本研究中,使用 Con A Sepharose 部分纯化 DNase II,从而能够通过蛋白质印迹法检测内源 DNase II。有趣的是,检测到了两种形式的内源 DNase II:30 kDa 形式和 23 kDa 形式。这两种形式均不具有预期的 45 kDa 分子量。亚细胞分级分离显示 23 kDa 和 30 kDa 蛋白质位于溶酶体中。在缺乏组织蛋白酶 L 的小鼠肝脏中,体内 DNase II 的加工也发生了很大的改变。从过表达 DNase II 的细胞中分泌到细胞外的 DNase II 被检测为前体形式,在酸性条件下被激活。这些结果表明 DNase II 在溶酶体中被加工和激活,而组织蛋白酶 L 参与该酶的加工。
Deoxyribonuclease II (DNase II) is a key enzyme in the phagocytic digestion of DNA from apoptotic nuclei. To understand the molecular properties of DNase II, particularly the processing, we prepared a polyclonal antibody against carboxyl-terminal sequences of mouse DNase II. In the present study, partial purification of DNase II using Con A Sepharose enabled the detection of endogenous DNase II by Western blotting. It was interesting that two forms of endogenous DNase II were detected – a 30 kDa form and a 23 kDa form. Neither of those forms carried the expected molecular weight of 45 kDa. Subcellular fractionation showed that the 23 kDa and 30 kDa proteins were localized in lysosomes. The processing of DNase II in vivo was also greatly altered in the liver of mice lacking cathepsin L. DNase II that was extracellularly secreted from cells overexpressing DNase II was detected as a pro-form, which was activated under acidic conditions. These results indicate that DNase II is processed and activated in lysosomes, while cathepsin L is involved in the processing of the enzyme.
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