PMID:6433

Citation	Pugsley, AP and Reeves, P (1976) Characterization of group B colicin-resistant mutants of Escherichia coli K-12: colicin resistance and the role of enterochelin.J. Bacteriol. 127:218-28
Abstract	Nine classes of group B colicin-resistant mutants were examined to study the role of enterochelin in colicin resistance. Four of the mutants studied (cbt, exbC, exbB, and tonB) hypersecreted enterochelin. Enterochelin hypersecretion was apparently responsible for resistance of the exbC mutant to colicins G and H and for resistance of the exbB mutant to colicins G, H, Ia, Ib, S1, and V. All four mutants scored as colicin B tolerant, even in the absence of enterochelin synthesis. The mutants produced substantially increased amounts of two high-molecular-weight outer membrane polypeptides when grown under limiting iron conditions. The presence of these polypeptides was correlated with increased colicin B-neutralizing activity in the outer membrane preparations.
Links	PubMed
Keywords	2,2'-Dipyridyl; Bacterial Proteins; Cell Membrane; Citrates; Colicins; Deferoxamine; Drug Resistance, Microbial; Edetic Acid; Enterobactin; Escherichia coli; Genes; Molecular Weight; Mutation; Peptide Biosynthesis; Serine
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Main Points of the Paper

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Materials and Methods Used

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Phenotype Annotations

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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
a mutation or genetic difference within a strain	Taxon: Escherichia coli Strain: K-12 Substrain: P575 NCBI Taxon ID: 83333	Genotype of Reference Strain: exbB Genotype of Experimental Strain : exbB in strain P575	Reference Condition:					Tolerance to colicin B
a mutation or genetic difference within a strain	Taxon: Escherichia coli Strain: K-12 Substrain: P575 NCBI Taxon ID: 83333	Genotype of Reference Strain: exbB Genotype of Experimental Strain : exbB in strain P575	Reference Condition:					Tolerance to colicin D
a mutation or genetic difference within a strain	Taxon: Escherichia coli Strain: K-12 Substrain: P575 NCBI Taxon ID: 83333	Genotype of Reference Strain: exbB Genotype of Experimental Strain : exbB in strain P575	Reference Condition:					Tolerance to colicin G
a mutation or genetic difference within a strain	Taxon: Escherichia coli Strain: K-12 Substrain: P575 NCBI Taxon ID: 83333	Genotype of Reference Strain: exbB Genotype of Experimental Strain : exbB in strain P575	Reference Condition:					Tolerance to colicin H
a mutation or genetic difference within a strain	Taxon: Escherichia coli Strain: K-12 Substrain: P575 NCBI Taxon ID: 83333	Genotype of Reference Strain: exbB Genotype of Experimental Strain : exbB in strain P575	Reference Condition:					Tolerance to colicin Ia
a mutation or genetic difference within a strain	Taxon: Escherichia coli Strain: K-12 Substrain: P575 NCBI Taxon ID: 83333	Genotype of Reference Strain: exbB Genotype of Experimental Strain : exbB in strain P575	Reference Condition:					Tolerance to colicin Ib
a mutation or genetic difference within a strain	Taxon: Escherichia coli Strain: K-12 Substrain: P575 NCBI Taxon ID: 83333	Genotype of Reference Strain: exbB Genotype of Experimental Strain : exbB in strain P575	Reference Condition:					Tolerance to colicin M
a mutation or genetic difference within a strain	Taxon: Escherichia coli Strain: K-12 Substrain: P575 NCBI Taxon ID: 83333	Genotype of Reference Strain: exbB Genotype of Experimental Strain : exbB in strain P575	Reference Condition:					Tolerance to colicin S1
a mutation or genetic difference within a strain	Taxon: Escherichia coli Strain: K-12 Substrain: P575 NCBI Taxon ID: 83333	Genotype of Reference Strain: exbB Genotype of Experimental Strain : exbB in strain P575	Reference Condition:					Partial Tolerance to colicin V
a mutation or genetic difference within a strain	Taxon: Escherichia coli Strain: K-12 Substrain: P575 NCBI Taxon ID: 83333	Genotype of Reference Strain: exbC Genotype of Experimental Strain : exbC in strain P575	Reference Condition:					Tolerance to colicin M
a mutation or genetic difference within a strain	Taxon: Escherichia coli Strain: K-12 Substrain: P575 NCBI Taxon ID: 83333	Genotype of Reference Strain: exbB Genotype of Experimental Strain : exbB in strain P575	Reference Condition:					Tolerance to colicin B
a mutation or genetic difference within a strain	Taxon: Escherichia coli Strain: K-12 Substrain: P575 NCBI Taxon ID: 83333	Genotype of Reference Strain: exbC Genotype of Experimental Strain : exbC in strain P575	Reference Condition:					Tolerance to colicin B
a mutation or genetic difference within a strain	Taxon: Escherichia coli Strain: K-12 Substrain: P575 NCBI Taxon ID: 83333	Genotype of Reference Strain: exbC Genotype of Experimental Strain : exbC in strain P575	Reference Condition:					Tolerance to colicin D
a mutation or genetic difference within a strain	Taxon: Escherichia coli Strain: K-12 Substrain: P575 NCBI Taxon ID: 83333	Genotype of Reference Strain: exbC Genotype of Experimental Strain : exbC in strain P575	Reference Condition:					Tolerance to colicin G
a mutation or genetic difference within a strain	Taxon: Escherichia coli Strain: K-12 Substrain: P575 NCBI Taxon ID: 83333	Genotype of Reference Strain: exbC Genotype of Experimental Strain : exbC in strain P575	Reference Condition:					Tolerance to colicin H
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Notes

OMP: Need to make terms for colicins. ECO: triple layer plate test

References

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