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Characterization of Pic, a Secreted Protease ofShigella flexneri and EnteroaggregativeEscherichia coli

机译:Pic的表征,一种志贺氏菌和肠聚合性大肠杆菌的分泌蛋白酶

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We have identified and characterized a secreted protein, designated Pic, which is encoded on the chromosomes of enteroaggregativeEscherichia coli (EAEC) 042 and Shigella flexneri 2457T. The product of the pic gene is synthesized as a 146.5-kDa precursor molecule which is processed at the N and C termini during secretion, allowing the release of a mature protein (109.8 kDa) into the culture supernatant. The deduced amino acid sequence of Pic shows high homology to autotransporter proteins, particularly a subgroup termed the SPATEs (serine protease autotransporters of the Enterobacteriaceae). Present in all members of this subgroup is a motif similar to the active sites of certain serine proteases. Pic catalyzes gelatin degradation, which can be abolished by disruption of the predicted proteolytic active site. Functional analysis of the Pic protein implicates this factor in mucinase activity, serum resistance, and hemagglutination. Our data suggest that Pic may be a multifunctional protein involved in enteric pathogenesis.
机译:我们已经鉴定并鉴定了一种称为Pic的分泌蛋白,该蛋白编码在肠聚合性大肠埃希氏大肠杆菌(EAEC)042和弗氏志贺氏菌2457T的染色体上。 pic 基因的产物被合成为146.5 kDa的前体分子,在分泌过程中在N和C末端进行加工,从而将成熟蛋白(109.8 kDa)释放到培养上清液中。 Pic推导的氨基酸序列与自转运蛋白具有高度同源性,特别是称为SPATEs(肠杆菌科的丝氨酸蛋白酶自转运蛋白)的亚组。存在于该亚组的所有成员中的是类似于某些丝氨酸蛋白酶的活性位点的基序。 Pic催化明胶降解,可以通过破坏预期的蛋白水解活性位点来消除。 Pic蛋白的功能分析将这一因素牵涉到粘蛋白酶活性,血清抵抗力和血凝反应中。我们的数据表明,Pic可能是参与肠病发病机制的多功能蛋白。

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