Difference between revisions of "PMID:2670903"

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'''Eick-Helmerich, K and Braun, V'''  (1989) Import of biopolymers into Escherichia coli: nucleotide sequences of the exbB and exbD genes are homologous to those of the tolQ and tolR genes, respectively.''J. Bacteriol.'' '''171''':5117-26
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!align=left  |Abstract
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Escherichia coli with mutations in the exb region are impaired in outer membrane receptor-dependent uptake processes. They are resistant to the antibiotic albomycin and exhibit reduced sensitivity to group B colicins. A 2.2-kilobase-pair DNA fragment of the exb locus was sequenced. It contained two open reading frames, designated exbB and exbD, which encoded polypeptides of 244 and 141 amino acids, respectively. Both proteins were found in the cytoplasmic membrane. They showed strong homologies to the TolQ and TolR proteins, respectively, which are involved in uptake of group A colicins and infection by filamentous bacteriophages. exbB and exbD were required to complement exb mutations. Osmotic shock treatment rendered exb mutants sensitive to colicin M, which was taken as evidence that the ExbB and ExbD proteins are involved in transport processes across the outer membrane. It is concluded that the exb- and tol-dependent systems originate from a common uptake system for biopolymers.
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[http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=2670903 PubMed]
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!align=left  |Keywords
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Amino Acid Sequence; Bacterial Proteins; Base Sequence; Biopolymers; DNA, Recombinant; Escherichia coli; Escherichia coli Proteins; Genes; Genes, Bacterial; Genotype; Membrane Proteins; Molecular Sequence Data; Plasmids; Sequence Homology, Nucleic Acid
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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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{| border="2" cellpadding="4" cellspacing="0" style="margin: 1em 1em 1em 0; border: 1px #aaa solid; border-collapse: collapse;"  id="T5005fd426e066"  class=" tableEdit Phenotype_Table_2" 
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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: Escherichia coli
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*Strain: K-12
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*Substrain: AB2847
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*NCBI Taxon ID: [http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&id=83333&lvl=3&lin=f&keep=1&srchmode=1&unlock 83333]
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*Genotype of Reference Strain: ''exbB''
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*Genotype of Experimental Strain : ''exbB (pKE67''
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*Reference Condition:
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0000276
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increased resistance to antimicrobial compound
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Resistance to Albomycin
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==Notes==
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==References==
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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 12:59, 24 January 2013

Citation

Eick-Helmerich, K and Braun, V (1989) Import of biopolymers into Escherichia coli: nucleotide sequences of the exbB and exbD genes are homologous to those of the tolQ and tolR genes, respectively.J. Bacteriol. 171:5117-26

Abstract

Escherichia coli with mutations in the exb region are impaired in outer membrane receptor-dependent uptake processes. They are resistant to the antibiotic albomycin and exhibit reduced sensitivity to group B colicins. A 2.2-kilobase-pair DNA fragment of the exb locus was sequenced. It contained two open reading frames, designated exbB and exbD, which encoded polypeptides of 244 and 141 amino acids, respectively. Both proteins were found in the cytoplasmic membrane. They showed strong homologies to the TolQ and TolR proteins, respectively, which are involved in uptake of group A colicins and infection by filamentous bacteriophages. exbB and exbD were required to complement exb mutations. Osmotic shock treatment rendered exb mutants sensitive to colicin M, which was taken as evidence that the ExbB and ExbD proteins are involved in transport processes across the outer membrane. It is concluded that the exb- and tol-dependent systems originate from a common uptake system for biopolymers.

Links

PubMed

Keywords

Amino Acid Sequence; Bacterial Proteins; Base Sequence; Biopolymers; DNA, Recombinant; Escherichia coli; Escherichia coli Proteins; Genes; Genes, Bacterial; Genotype; Membrane Proteins; Molecular Sequence Data; Plasmids; Sequence Homology, Nucleic Acid

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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

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<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: Escherichia coli
  • Strain: K-12
  • Substrain: AB2847
  • NCBI Taxon ID: 83333
  • Genotype of Reference Strain: exbB
  • Genotype of Experimental Strain : exbB (pKE67
  • Reference Condition:

0000276

increased resistance to antimicrobial compound

Resistance to Albomycin


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</protect>

Notes

References

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