Escherichia coli Subtilase Cytotoxin.

Escherichia coli Subtilase Cytotoxin.
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DOI:
10.3390/toxins2020215
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发表时间:
2010-02-01
期刊:
影响因子:
4.2
通讯作者:
Paton JC
Paton JC
中科院分区:
医学2区
文献类型:
--
作者:
Paton AW;Paton JC

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枯草杆菌细胞毒素(SubAB)是由志贺产毒大肠杆菌(STEC)亚群产生的一个新的AB5毒素家族的原型。它的A亚基是一种类似枯草杆菌酶的丝氨酸蛋白酶,对真核细胞的细胞毒性是由于Bip/GRP78的高度特异性和单位点切割所致,Bip/GRP78是位于内质网(ER)中的一个必不可少的Hsp70家族伴侣。这种裂解触发了严重且未解决的内质网应激反应,最终触发了细胞凋亡。B亚基对终止于唾液酸N-羟基神经氨酸的糖链具有专一性。虽然它在人类疾病发病机制中的实际作用尚未确定,但SubAB对小鼠是致命的,并导致与溶血性尿毒症综合征重叠的病理特征,溶血性尿毒症综合征是STEC感染的一种威胁生命的并发症。这种毒素也被证明是一种有用的工具,可以探索Bip和ER应激在各种细胞功能中的作用。
Subtilase cytotoxin (SubAB) is the prototype of a new AB5 toxin family produced by a subset of Shiga toxigenic Escherichia coli (STEC) strains. Its A subunit is a subtilase-like serine protease and cytotoxicity for eukaryotic cells is due to a highly specific, single-site cleavage of BiP/GRP78, an essential Hsp70 family chaperone located in the endoplasmic reticulum (ER). This cleavage triggers a severe and unresolved ER stress response, ultimately triggering apoptosis. The B subunit has specificity for glycans terminating in the sialic acid N-glycolylneuraminic acid. Although its actual role in human disease pathogenesis is yet to be established, SubAB is lethal for mice and induces pathological features overlapping those seen in the haemolytic uraemic syndrome, a life-threatening complication of STEC infection. The toxin is also proving to be a useful tool for probing the role of BiP and ER stress in a variety of cellular functions.
DOI: 10.1128/jvi.00762-09
发表时间: 2009-11-15
影响因子: 5.4
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