Bdellovibrio, δ-proteobacteria, including B. bacteriovorus (Bba) and B. exovorus (Bex), are obligate predators of other Gram-negative bacteria. While Bba grows in the periplasm of the prey cell, Bex grows externally. We have analyzed and compared the transport proteins of these 2 organisms based on the current contents of the Transporter Classification Database (TCDB; www.tcdb.org). Bba has 103 transporters more than Bex, 50% more secondary carriers, and 3 times as many MFS carriers. Bba has far more metabolite transporters than Bex as expected from its larger genome, but there are 2 times more carbohydrate uptake and drug efflux systems, and 3 times more lipid transporters. Bba also has polyamine and carboxylate transporters lacking in Bex. Bba has more than twice as many members of the Mot-Exb family of energizers, but both may have energizers for gliding motility. They use entirely different types of systems for iron acquisition. Both contain unexpectedly large numbers of pseudogenes and incomplete systems, suggesting that they are undergoing genome size reduction. Interestingly, all 5 outer-membrane receptors in Bba are lacking in Bex. The 2 organisms have similar numbers and types of peptide and amino acid uptake systems as well as protein and carbohydrate secretion systems. The differences observed correlate with and may account, in part, for the different lifestyles of these 2 bacterial predators.

中文翻译：

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Bdellovibrio bacteriovorus HD100和Bdellovibrio exovorus JSS基因组内编码的转运蛋白的比较分析。

Bdellovibrio，δ-变形杆菌，包括细菌性B.细菌（Bba）和外来性B. exovorus（Bex），是其他革兰氏阴性细菌的专性捕食者。Bba在猎物细胞的周质中生长，而Bex在外部生长。我们已经根据转运蛋白分类数据库（TCDB; www.tcdb.org）的当前内容分析和比较了这两种生物的转运蛋白。Bba的运输商比Bex多103架，二级运输商多50％，是MFS运输商的3倍。正如从更大的基因组所预期的那样，Bba的代谢物转运蛋白比Bex得多，但碳水化合物吸收和药物外排系统的代谢转运蛋白的数量是Bex的2倍，脂质转运蛋白的数量是Bex的3倍。Bba还具有Bex中缺少的多胺和羧酸盐转运蛋白。Bba的Mot-Exb激励器系列成员数量是其两倍多，但两者都可能为滑行运动提供能量。他们使用完全不同类型的系统来获取铁。两者都包含出乎意料的大量假基因和不完整的系统，这表明它们正在减小基因组的大小。有趣的是，Bex中缺少Bba中的所有5种外膜受体。这两种生物具有相似数量和类型的肽和氨基酸摄取系统，以及蛋白质和碳水化合物分泌系统。观察到的差异与这两种细菌捕食者的不同生活方式有关，并可能部分解释其差异。Bex中缺少Bba中的所有5种外膜受体。这两种生物具有相似数量和类型的肽和氨基酸摄取系统，以及蛋白质和碳水化合物分泌系统。观察到的差异与这两种细菌捕食者的不同生活方式有关，并可能部分解释其差异。Bex中缺少Bba中的所有5种外膜受体。这两种生物具有相似数量和类型的肽和氨基酸摄取系统，以及蛋白质和碳水化合物分泌系统。观察到的差异与这两种细菌捕食者的不同生活方式有关，并可能部分解释其差异。