Salmonella pathogenesis and processing of secreted effectors by caspase-3.

Salmonella pathogenesis and processing of secreted effectors by caspase-3.
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DOI:
10.1126/science.1194598
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发表时间:
2010-10-15
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
McCormick BA
McCormick BA
中科院分区:
其他
文献类型:
--
作者:
Srikanth CV;Wall DM;Maldonado-Contreras A;Shi H;Zhou D;Demma Z;Mumy KL;McCormick BA

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肠道病原体鼠伤寒沙门氏菌(Salmonella enterica serovar Typhimurium)会导致食物中毒,引发肠胃炎。鼠伤寒沙门氏菌的效应蛋白SipA通过一些功能基序促进肠胃炎,这些基序要么触发炎症机制,要么促进细菌进入细胞。在肠道上皮细胞感染过程中,发现SipA负责半胱天冬酶 - 3(caspase - 3)的早期激活,半胱天冬酶 - 3是一种在特定识别基序处对SipA进行切割所必需的酶,这种切割将蛋白质分成两个功能结构域,并以一种对致病性必要的方式激活SipA。在鼠伤寒沙门氏菌中发现的其他半胱天冬酶 - 3切割位点似乎仅限于分泌的效应蛋白,这表明这可能是该病原体加工其分泌效应蛋白所采用的一种普遍策略。
The enteric pathogen, Salmonella enterica serovar Typhimurium, causes food poisoning resulting in gastroenteritis. The S. Typhimurium effector protein, SipA, promotes gastroenteritis by functional motifs that either trigger mechanisms of inflammation or bacterial entry. During infection of intestinal epithelial cells, SipA was found to be responsible for the early activation of caspase-3, an enzyme that is required for SipA cleavage at a specific recognition motif that divided the protein into its two functional domains, and activated SipA in a manner necessary for pathogenicity. Other caspase-3 cleavage sites identified in S. Typhimurium appeared to be restricted to secreted effector proteins, indicating this may be a general strategy employed by this pathogen for processing of its secreted effectors.
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