Function of FlhB, a membrane protein implicated in the bacterial flagellar type III secretion system

The membrane protein FlhB is a highly conserved component of the flagellar secretion system, and it plays an active role in the regulation of protein export. In this study conserved properties of FlhB that are important for its function were investigated. Replacing the flhB gene (or part of the gene...

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Veröffentlicht in:PloS one 2013-07, Vol.8 (7), p.e68384
Hauptverfasser: Meshcheryakov, Vladimir A, Barker, Clive S, Kostyukova, Alla S, Samatey, Fadel A
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Barker, Clive S
Kostyukova, Alla S
Samatey, Fadel A
description The membrane protein FlhB is a highly conserved component of the flagellar secretion system, and it plays an active role in the regulation of protein export. In this study conserved properties of FlhB that are important for its function were investigated. Replacing the flhB gene (or part of the gene) in Salmonella typhimurium with the flhB gene of the distantly related bacterium Aquifex aeolicus greatly reduces motility. However, motility can be restored to some extent by spontaneous mutations in the part of flhB gene coding for the cytoplasmic domain of Aquifex FlhB. Structural analysis suggests that these mutations destabilize the structure. The secondary structure and stability of the mutated cytoplasmic fragments of FlhB have been studied by circular dichroism spectroscopy. The results suggest that conformational flexibility could be important for FlhB function. An extragenic suppressor mutation in the fliS gene, which decreases the affinity of FliS to FliC, partially restores motility of the FlhB substitution mutants.
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In this study conserved properties of FlhB that are important for its function were investigated. Replacing the flhB gene (or part of the gene) in Salmonella typhimurium with the flhB gene of the distantly related bacterium Aquifex aeolicus greatly reduces motility. However, motility can be restored to some extent by spontaneous mutations in the part of flhB gene coding for the cytoplasmic domain of Aquifex FlhB. Structural analysis suggests that these mutations destabilize the structure. The secondary structure and stability of the mutated cytoplasmic fragments of FlhB have been studied by circular dichroism spectroscopy. The results suggest that conformational flexibility could be important for FlhB function. 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In this study conserved properties of FlhB that are important for its function were investigated. Replacing the flhB gene (or part of the gene) in Salmonella typhimurium with the flhB gene of the distantly related bacterium Aquifex aeolicus greatly reduces motility. However, motility can be restored to some extent by spontaneous mutations in the part of flhB gene coding for the cytoplasmic domain of Aquifex FlhB. Structural analysis suggests that these mutations destabilize the structure. The secondary structure and stability of the mutated cytoplasmic fragments of FlhB have been studied by circular dichroism spectroscopy. The results suggest that conformational flexibility could be important for FlhB function. An extragenic suppressor mutation in the fliS gene, which decreases the affinity of FliS to FliC, partially restores motility of the FlhB substitution mutants.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>23874605</pmid><doi>10.1371/journal.pone.0068384</doi><tpages>e68384</tpages><oa>free_for_read</oa></addata></record>
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subjects Amino Acid Sequence
Bacteria
Bacterial Proteins - genetics
Bacterial Proteins - metabolism
Bioinformatics
Biology
Circular dichroism
Cytoplasm - genetics
Cytoplasm - metabolism
Dichroism
Enzymes
Flagella
Flagella - genetics
Flagella - metabolism
Flexibility
Genes
Genetic engineering
Genetic suppression
Kinases
Membrane proteins
Membrane Proteins - genetics
Membrane Proteins - metabolism
Molecular Sequence Data
Motility
Mutants
Mutation
Physics
Plasmids
Protein structure
Protein Structure, Secondary
Protein Structure, Tertiary
Protein Transport
Proteins
Recombinant Fusion Proteins - genetics
Recombinant Fusion Proteins - metabolism
Salmonella
Salmonella Typhimurium
Salmonella typhimurium - genetics
Salmonella typhimurium - metabolism
Secondary structure
Secretion
Sequence Alignment
Spectroscopy
Spectrum analysis
Structural analysis
Structural stability
Suppression, Genetic - genetics
title Function of FlhB, a membrane protein implicated in the bacterial flagellar type III secretion system
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