Outer membrane proteome of Prevotella intermedia 17: identification of thioredoxin and iron-repressible hemin uptake loci.

Outer membrane proteome of Prevotella intermedia 17: identification of thioredoxin and iron-repressible hemin uptake loci.
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中间普雷沃氏菌 17 的外膜蛋白质组:硫氧还蛋白和铁抑制血红素摄取位点的鉴定。

DOI:
10.1002/pmic.200600441
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发表时间:
2007
期刊:
影响因子:
3.4
通讯作者:
Lewis,JaninaP
Lewis,JaninaP
中科院分区:
生物学3区
文献类型:
--
作者:
Yu,Fan;Anaya,Cecilia;Lewis,JaninaP

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虽然血红素是口腔病原体中间普氏菌不可缺少的营养物质,但关于血红素获得的分子机制尚不清楚。细菌基因组序列的可用性使我们能够应用蛋白质组学方法来鉴定可能介导血红蛋白获取过程的蛋白质。由于血红蛋白获取机制已被证明在缺铁条件下被诱导,我们应用蛋白质组学方法检测那些表达受铁影响的蛋白质。我们分析了40个蛋白质点,鉴定出19个这样的蛋白质。有趣的是,两种蛋白PIN0009和PINA0611在缺铁条件下急剧上调,是其他细菌中血红蛋白摄取受体的同源物。预计PIN0009是一种外膜脂蛋白。它是由一个基因编码,是一个新的血红蛋白获取系统的蛋白质的七个基因基因组位点中的第一个。第二种蛋白PINA0611是许多依赖TonB的外膜受体的同源物,包括各种革兰氏阴性细菌的外膜铁摄取受体。还有另一种由铁调节的蛋白质,先前已被证明与血红蛋白结合。媒介物。最后,我们发现了一种具有新颖外膜位置的硫氧还蛋白样蛋白。
Although hemin is an indispensable nutrient for the oral pathogenPrevotella intermedia, not much is known regarding the molecular mechanisms of hemin acquisition. The availability of the genomic sequence of the bacterium allowed us to apply proteomic approaches to identify proteins that may be mediating the hemin acquisition process. As hemin acquisition mechanisms have been shown to be induced in iron‐depleted conditions, we applied proteomic approaches to detect those proteins whose expressions were affected by iron. We analyzed 40 protein spots and identified 19 such proteins. Interestingly, two proteins drastically upregulated in iron‐depleted conditions, PIN0009 and PINA0611, are homologs of hemin uptake receptors in other bacteria. PIN0009 is predicted to be an outer membrane lipoprotein. It is encoded by a gene that is the first of a seven‐gene genomic locus encoding proteins of a novel hemin acquisition system. The second protein, PINA0611, is a homolog of numerous TonB‐dependent outer membrane receptors including outer membrane iron uptake receptors of various Gram‐negative bacteria. There was also another protein, regulated by iron, that was previously demonstrated to bind hemoglobin inP. intermedia. Finally, we identified a thioredoxin‐like protein that has a novel outer membrane location.
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