Prediction of extracellular proteases of the human pathogen Helicobacter pylori reveals proteolytic activity of the Hp1018/19 protein HtrA.

Prediction of extracellular proteases of the human pathogen Helicobacter pylori reveals proteolytic activity of the Hp1018/19 protein HtrA.
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人类病原体幽门螺杆菌的细胞外蛋白酶的预测揭示了HP1018/19蛋白HTRA的蛋白水解活性。

DOI:
10.1371/journal.pone.0003510
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发表时间:
2008
期刊:
影响因子:
3.7
通讯作者:
Schneider, Gisbert
Schneider, Gisbert
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Loewer, Martin;Weydig, Christiane;Metzler, Dirk;Reuter, Andreas;Starzinski-Powitz, Anna;Wessler, Silja;Schneider, Gisbert

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幽门螺杆菌(Helicobacter pylori,H.幽门螺杆菌)可能参与导致胃炎症和肿瘤形成的病原体相关疾病。通过对H. pylori蛋白质组的预测分泌蛋白酶,我们检索到几个候选基因。我们检测了几种这样的蛋白酶的酪蛋白溶解活性,这些蛋白酶独立于H. pylori IV型分泌系统由cag致病岛(cagPAI)编码。其中,我们发现了预测的丝氨酸蛋白酶HtrA(Hp 1019),这是以前确定的细菌分泌组的H。幽门。重要的是,我们进一步发现,H。幽门螺杆菌基因HP 1018和HP 1019代表可能编码输出蛋白的单个基因。在此,我们直接验证了HtrA的体外蛋白水解活性,并通过质谱鉴定了酶谱中的HtrA蛋白酶。过表达和纯化的HtrA表现出明显的蛋白水解活性,这是失活后的Ser205突变为丙氨酸在预测的HtrA的活性中心。这些数据表明H.幽门螺杆菌分泌HtrA作为一种活性蛋白酶,这可能是一个新的候选目标的治疗干预策略。
Exported proteases of Helicobacter pylori (H. pylori) are potentially involved in pathogen-associated disorders leading to gastric inflammation and neoplasia. By comprehensive sequence screening of the H. pylori proteome for predicted secreted proteases, we retrieved several candidate genes. We detected caseinolytic activities of several such proteases, which are released independently from the H. pylori type IV secretion system encoded by the cag pathogenicity island (cagPAI). Among these, we found the predicted serine protease HtrA (Hp1019), which was previously identified in the bacterial secretome of H. pylori. Importantly, we further found that the H. pylori genes hp1018 and hp1019 represent a single gene likely coding for an exported protein. Here, we directly verified proteolytic activity of HtrA in vitro and identified the HtrA protease in zymograms by mass spectrometry. Overexpressed and purified HtrA exhibited pronounced proteolytic activity, which is inactivated after mutation of Ser205 to alanine in the predicted active center of HtrA. These data demonstrate that H. pylori secretes HtrA as an active protease, which might represent a novel candidate target for therapeutic intervention strategies.
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