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- W2110722023 startingPage "2998" @default.
- W2110722023 abstract "ABSTRACT Pathogenicity of Xanthomonas campestris pv. vesicatoria depends on a type III secretion (T3S) system which translocates effector proteins into eukaryotic cells and is associated with an extracellular pilus and a translocon in the host plasma membrane. T3S substrate specificity is controlled by the cytoplasmic switch protein HpaC, which interacts with the C-terminal domain of the inner membrane protein HrcU (HrcU C ). HpaC promotes the secretion of translocon and effector proteins but prevents the efficient secretion of the early T3S substrate HrpB2, which is required for pilus assembly. In this study, complementation assays with serial 10-amino-acid HpaC deletion derivatives revealed that the T3S substrate specificity switch depends on N- and C-terminal regions of HpaC, whereas amino acids 42 to 101 appear to be dispensable for the contribution of HpaC to the secretion of late substrates. However, deletions in the central region of HpaC affect the secretion of HrpB2, suggesting that the mechanisms underlying HpaC-dependent control of early and late substrates can be uncoupled. The results of interaction and expression studies with HpaC deletion derivatives showed that amino acids 112 to 212 of HpaC provide the binding site for HrcU C and severely reduce T3S when expressed ectopically in the wild-type strain. We identified a conserved phenylalanine residue at position 175 of HpaC that is required for both protein function and the binding of HpaC to HrcU C . Taking these findings together, we concluded that the interaction between HpaC and HrcU C is essential but not sufficient for T3S substrate specificity switching." @default.
- W2110722023 created "2016-06-24" @default.
- W2110722023 creator A5012677090 @default.
- W2110722023 creator A5050164204 @default.
- W2110722023 date "2011-08-01" @default.
- W2110722023 modified "2023-10-14" @default.
- W2110722023 title "Functional Characterization of the Type III Secretion Substrate Specificity Switch Protein HpaC from Xanthomonas campestris pv. vesicatoria" @default.
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- W2110722023 doi "https://doi.org/10.1128/iai.00180-11" @default.
- W2110722023 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3147569" @default.
- W2110722023 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21576326" @default.
- W2110722023 hasPublicationYear "2011" @default.
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