Difference between revisions of "PMID:1314797"

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'''Rowbury, RJ, Goodson, M and Wallace, AD'''  (1992) The PhoE porin and transmission of the chemical stimulus for induction of acid resistance (acid habituation) in Escherichia coli.''J. Appl. Bacteriol.'' '''72''':233-43
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!align=left  |Abstract
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Escherichia coli K12 becomes resistant to killing by acid (habituates to acid) in a few minutes at pH 5.0. Habituation involves protein synthesis-dependent and -independent stages; both must occur at an habituating pH. The habituation sensor does not detect increased delta pH (or decreased delta psi) nor an increased difference between pHo and periplasmic pH but probably detects a fall in either external or periplasmic pH. Phosphate ions inhibit habituation, at any stage, probably by interfering with outer membrane passage of hydrogen ions. Most outer membrane components tested are not required for habituation but phoE deletion mutants habituated poorly and are acid-resistant. Strains derepressed for phoE, in contrast, showed increased acid sensitivity. These and other results suggest that habituation involves hydrogen ions or protonated carriers crossing the outer membrane preferentially via the PhoE pore, a process inhibited by phosphate and other anions. Stimulation by phosphate of the poor growth of E. coli at pH 5.0 is in accord with the above. Acetate did not enhance acid killing of pH 5.0 cells, suggesting that their resistance does not depend on maintaining pHi near to neutrality at an acidic pHo level.
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[http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=1314797 PubMed]
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!align=left  |Keywords
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Adaptation, Physiological; Bacterial Outer Membrane Proteins; Escherichia coli; Hydrogen-Ion Concentration; Mutation; Phosphates; Porins; Transduction, Genetic
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==Main Points of the Paper ==
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{{LitSignificance}}
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== Materials and Methods Used ==
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{{LitMaterials}}
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==Phenotype Annotations==
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{{AnnotationTableHelp}}
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!|Phenotype of!!Taxon Information!!Genotype Information (if known)!!Condition Information!!OMP ID!!OMP Term Name!!ECO ID!!ECO Term Name!!Notes!!Status
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a mutation or genetic difference within a strain
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*Taxon: K-12
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*Strain: Escherichia coli
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*Substrain: 1157-4
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*NCBI Taxon ID: [http://www.ncbi.nlm.nih.gov/taxonomy?term=83333 83333]
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*Genotype of Reference Strain: ''phoE''
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*Genotype of Experimental Strain : ''phoE<sup>+</sup>''
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*Reference Condition:
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Increased acid sensitivity, table 9.
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a mutation or genetic difference within a strain
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*Taxon: Escherichia coli
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*Strain: K-12
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*Substrain: 1157
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*NCBI Taxon ID: [http://www.ncbi.nlm.nih.gov/taxonomy?term=83333 83333]
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*Genotype of Reference Strain: ''phoE''
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*Genotype of Experimental Strain : ''phoE(del)''
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*Reference Condition:
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Increased resistance to acid, table 9.
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==Notes==
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==References==
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{{RefHelp}}
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<references/>
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[[Category:Publication]] [[Category:Papers referenced in the LaRossa chapter]] [[Category:LaRossa citations that need review]]

Latest revision as of 16:25, 30 April 2012

Citation

Rowbury, RJ, Goodson, M and Wallace, AD (1992) The PhoE porin and transmission of the chemical stimulus for induction of acid resistance (acid habituation) in Escherichia coli.J. Appl. Bacteriol. 72:233-43

Abstract

Escherichia coli K12 becomes resistant to killing by acid (habituates to acid) in a few minutes at pH 5.0. Habituation involves protein synthesis-dependent and -independent stages; both must occur at an habituating pH. The habituation sensor does not detect increased delta pH (or decreased delta psi) nor an increased difference between pHo and periplasmic pH but probably detects a fall in either external or periplasmic pH. Phosphate ions inhibit habituation, at any stage, probably by interfering with outer membrane passage of hydrogen ions. Most outer membrane components tested are not required for habituation but phoE deletion mutants habituated poorly and are acid-resistant. Strains derepressed for phoE, in contrast, showed increased acid sensitivity. These and other results suggest that habituation involves hydrogen ions or protonated carriers crossing the outer membrane preferentially via the PhoE pore, a process inhibited by phosphate and other anions. Stimulation by phosphate of the poor growth of E. coli at pH 5.0 is in accord with the above. Acetate did not enhance acid killing of pH 5.0 cells, suggesting that their resistance does not depend on maintaining pHi near to neutrality at an acidic pHo level.

Links

PubMed

Keywords

Adaptation, Physiological; Bacterial Outer Membrane Proteins; Escherichia coli; Hydrogen-Ion Concentration; Mutation; Phosphates; Porins; Transduction, Genetic

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Main Points of the Paper

Please summarize the main points of the paper.

Materials and Methods Used

Please list the materials and methods used in this paper (strains, plasmids, antibodies, etc).

Phenotype Annotations

See Help:AnnotationTable for details on how to edit this table.
<protect>

Phenotype of Taxon Information Genotype Information (if known) Condition Information OMP ID OMP Term Name ECO ID ECO Term Name Notes Status

a mutation or genetic difference within a strain

  • Taxon: K-12
  • Strain: Escherichia coli
  • Substrain: 1157-4
  • NCBI Taxon ID: 83333
  • Genotype of Reference Strain: phoE
  • Genotype of Experimental Strain : phoE+
  • Reference Condition:

Increased acid sensitivity, table 9.

a mutation or genetic difference within a strain

  • Taxon: Escherichia coli
  • Strain: K-12
  • Substrain: 1157
  • NCBI Taxon ID: 83333
  • Genotype of Reference Strain: phoE
  • Genotype of Experimental Strain : phoE(del)
  • Reference Condition:

Increased resistance to acid, table 9.


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Notes

References

See Help:References for how to manage references in omp dev.

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