Structure-Function Analysis of BfpB, a Secretin-Like Protein Encoded by the Bundle-Forming-Pilus Operon of Enteropathogenic Escherichia coli
| Autor: | David Bieber, Jaiweon Hwang, Sandra W. Ramer, Sarah A. Schmidt, Cheng-Yen Wu, Gary K. Schoolnik |
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| Rok vydání: | 2001 |
| Předmět: |
Macromolecular Substances
Immunoprecipitation Operon Lipoproteins Protein subunit Molecular Sequence Data Porins Cell Surfaces Biology medicine.disease_cause Microbiology Pilus Secretin Vancomycin Escherichia coli medicine Amino Acid Sequence Enteropathogenic Escherichia coli Molecular Biology Peptide sequence Sequence Homology Amino Acid Escherichia coli Proteins Cell Membrane Biochemistry Fimbriae Bacterial Bacterial outer membrane Bacterial Outer Membrane Proteins |
| Zdroj: | Journal of Bacteriology. 183:4848-4859 |
| ISSN: | 1098-5530 0021-9193 |
| DOI: | 10.1128/jb.183.16.4848-4859.2001 |
| Popis: | Production of type IV bundle-forming pili by enteropathogenic Escherichia coli (EPEC) requires BfpB, an outer-membrane lipoprotein and member of the secretin protein superfamily. BfpB was found to compose a ring-shaped, high-molecular-weight outer-membrane complex that is stable in 4% sodium dodecyl sulfate at temperatures of ≤65°C. Chemical cross-linking and immunoprecipitation experiments disclosed that the BfpB multimeric complex interacts with BfpG, and mutational studies showed that BfpG is required for the formation and/or stability of the multimer but not for the outer-membrane localization of BfpB. Formation of the BfpB multimer also does not require BfpA, the repeating subunit of the pilus filament. Functional studies of the BfpB-BfpG complex revealed that its presence confers vancomycin sensitivity, indicating that it may form an incompletely gated channel through the outer membrane. BfpB expression is also associated with accumulation of EPEC proteins in growth medium, suggesting that it may support both pilus biogenesis and protein secretion. |
| Databáze: | OpenAIRE |
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