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
中科院分区:
文献类型:
--
作者:
Loewer, Martin;Weydig, Christiane;Metzler, Dirk;Reuter, Andreas;Starzinski-Powitz, Anna;Wessler, Silja;Schneider, Gisbert
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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影响因子:
3.2
作者:
ABDULLAH, KM;LO, RYC;MELLORS, A
通讯作者:
MELLORS, A
影响因子:
4.4
作者:
Min, DQ;Moore, AG;Lyons, JG
通讯作者:
Lyons, JG
影响因子:
14.9
作者:
Pruitt KD;Tatusova T;Maglott DR
通讯作者:
Maglott DR
影响因子:
4.2
作者:
Bendtsen JD;Kiemer L;Fausbøll A;Brunak S
通讯作者:
Brunak S
DOI:
10.1152/ajpgi.2001.281.3.g823
发表时间:
2001-09-01
影响因子:
4.5
作者:
Göoz, M;Göoz, P;Smolka, AJ
通讯作者:
Smolka, AJ