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• W2394540729 endingPage "3347" @default.
• W2394540729 startingPage "3331" @default.
• W2394540729 abstract "The plant-pathogenic bacterium Xanthomonas campestris pv. vesicatoria employs a type III secretion (T3S) system to translocate effector proteins into plant cells. The T3S apparatus spans both bacterial membranes and is associated with an extracellular pilus and a channel-like translocon in the host plasma membrane. T3S is controlled by the switch protein HpaC, which suppresses secretion and translocation of the predicted inner rod protein HrpB2 and promotes secretion of translocon and effector proteins. We previously reported that HrpB2 interacts with HpaC and the cytoplasmic domain of the inner membrane protein HrcU (C. Lorenz, S. Schulz, T. Wolsch, O. Rossier, U. Bonas, and D. Büttner, PLoS Pathog 4:e1000094, 2008, http://dx.doi.org/10.1371/journal.ppat.1000094). However, the molecular mechanisms underlying the control of HrpB2 secretion are not yet understood. Here, we located a T3S and translocation signal in the N-terminal 40 amino acids of HrpB2. The results of complementation experiments with HrpB2 deletion derivatives revealed that the T3S signal of HrpB2 is essential for protein function. Furthermore, interaction studies showed that the N-terminal region of HrpB2 interacts with the cytoplasmic domain of HrcU, suggesting that the T3S signal of HrpB2 contributes to substrate docking. Translocation of HrpB2 is suppressed not only by HpaC but also by the T3S chaperone HpaB and its secreted regulator, HpaA. Deletion of hpaA, hpaB, and hpaC leads to a loss of pathogenicity but allows the translocation of fusion proteins between the HrpB2 T3S signal and effector proteins into leaves of host and non-host plants.The T3S system of the plant-pathogenic bacterium Xanthomonas campestris pv. vesicatoria is essential for pathogenicity and delivers effector proteins into plant cells. T3S depends on HrpB2, which is a component of the predicted periplasmic inner rod structure of the secretion apparatus. HrpB2 is secreted during the early stages of the secretion process and interacts with the cytoplasmic domain of the inner membrane protein HrcU. Here, we localized the secretion and translocation signal of HrpB2 in the N-terminal 40 amino acids and show that this region is sufficient for the interaction with the cytoplasmic domain of HrcU. Our results suggest that the T3S signal of HrpB2 is required for the docking of HrpB2 to the secretion apparatus. Furthermore, we provide experimental evidence that the N-terminal region of HrpB2 is sufficient to target effector proteins for translocation in a nonpathogenic X. campestris pv. vesicatoria strain." @default.
• W2394540729 created "2016-06-24" @default.
• W2394540729 creator A5012677090 @default.
• W2394540729 creator A5018051004 @default.
• W2394540729 creator A5050164204 @default.
• W2394540729 creator A5069581438 @default.
• W2394540729 creator A5084172665 @default.
• W2394540729 date "2016-06-01" @default.
• W2394540729 modified "2023-09-26" @default.
• W2394540729 title "Type III-Dependent Translocation of HrpB2 by a Nonpathogenic <i>hpaABC</i> Mutant of the Plant-Pathogenic Bacterium Xanthomonas campestris pv. vesicatoria" @default.
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• W2394540729 doi "https://doi.org/10.1128/aem.00537-16" @default.
• W2394540729 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4959247" @default.
• W2394540729 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/27016569" @default.
• W2394540729 hasPublicationYear "2016" @default.

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