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Subcellular localization of TatAd of Bacillus subtilis depends on the presence of TatCd or TatCy.

J. Bacteriol.2009 Jul;191(13):4410-8. Epub 2009 Apr 24
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摘要


The gram-positive bacterium Bacillus subtilis contains two minimal Tat translocases, TatAdCd and TatAyCy, which are each involved in the secretion of one or more specific protein substrates. We have investigated the subcellular localization of the TatA components by employing C-terminal green fluorescent protein (GFP) fusions and fluorescence microscopy. When expressed from a xylose-inducible promoter, the TatA-GFP fusion proteins displayed a dual localization pattern, being localized peripherally and showing bright foci which are predominantly located at the division sites and/or poles of the cells. Importantly, the localization of TatAd-GFP was similar when the protein was expressed from its own promoter under phosphate starvation conditions, indicating that these foci are not the result of artificial overexpression. Moreover, the TatAd-GFP fusion protein was shown to be functional in the translocation of its substrate PhoD, provided that TatCd is also present. Furthermore, we demonstrate that the localization of TatAd-GFP in foci depends on the presence of the TatCd component. Remarkably, however, the TatAd-GFP foci can also be observed in the presence of TatCy, indicating that TatAd can interact not only with TatCd but also with TatCy. These results suggest that the formation of TatAd complexes in B. subtilis is controlled by TatC.

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