Difference between revisions of "PMID:4886277"
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| − | '''Squires, CK and Ingraham, JL''' (1969) Mutant of Escherichia coli exhibiting a cold-sensitive phenotype for growth on lactose.''J. Bacteriol.'' '''97''':488-94 | + | '''Squires, CK and Ingraham, JL''' (1969) Mutant of Escherichia coli exhibiting a cold-sensitive phenotype for growth on lactose. ''J. Bacteriol.'' '''97''':488-94 |
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| − | !align=left | + | !align=left align='left' bgcolor='#CCCCFF' |Abstract |
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As part of a study on the effect of low temperature on cellular regulatory processes, a class of lactose-negative mutants of Escherichia coli K-12 was isolated which could use lactose as a sole carbon and energy source at 37 C, but which could not use this sugar at 20 C. The lactose operon of the mutants functioned normally at 20 C. Galactose exhibited a strong inhibitory effect on growth, especially at 20 C. Growth of the mutants on glycerol was stopped at 20 C and slowed considerably at 37 C if galactose was added to the medium. Making the mutants galactose-positive eliminated the cold sensitivity of lactose utilization. One mutant was shown to be galactose-1-phosphate uridyl transferase-negative, galactose-kinase heat-sensitive, and uridine diphosphate-galactose-4-epimerase-positive. It is postulated that the mutant is able to phosphorylate galactose at 20 C (if only at a very low rate), but lacking transferase it is poisoned by the accumulation of galactose-1-phosphate. At 37 C, galactokinase is nonfunctional and the mutant grows on the glucose moiety of lactose. | As part of a study on the effect of low temperature on cellular regulatory processes, a class of lactose-negative mutants of Escherichia coli K-12 was isolated which could use lactose as a sole carbon and energy source at 37 C, but which could not use this sugar at 20 C. The lactose operon of the mutants functioned normally at 20 C. Galactose exhibited a strong inhibitory effect on growth, especially at 20 C. Growth of the mutants on glycerol was stopped at 20 C and slowed considerably at 37 C if galactose was added to the medium. Making the mutants galactose-positive eliminated the cold sensitivity of lactose utilization. One mutant was shown to be galactose-1-phosphate uridyl transferase-negative, galactose-kinase heat-sensitive, and uridine diphosphate-galactose-4-epimerase-positive. It is postulated that the mutant is able to phosphorylate galactose at 20 C (if only at a very low rate), but lacking transferase it is poisoned by the accumulation of galactose-1-phosphate. At 37 C, galactokinase is nonfunctional and the mutant grows on the glucose moiety of lactose. | ||
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| − | [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=4886277 PubMed] | + | [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=4886277 PubMed] [http://www.ncbi.nlm.nih.gov/pmc/articles/PMC249716 PMC249716] |
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| − | !align=left | + | !align=left align='left' bgcolor='#CCCCFF' |Keywords |
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| − | Enzyme Induction; Escherichia coli; Galactose; Galactosidases; Genetic Complementation Test; Genetics, Microbial; Glucose; Lactose; Membrane Transport Proteins; Molecular Biology; Mutation; Phosphotransferases; Temperature | + | Enzyme Induction; Escherichia coli/drug effects; Escherichia coli/enzymology; Escherichia coli/metabolism; Galactose/pharmacology; Galactosidases/metabolism; Genetic Complementation Test; Genetics, Microbial; Glucose/metabolism; Lactose/metabolism; Membrane Transport Proteins/metabolism; Molecular Biology; Mutation; Phosphotransferases/metabolism; Temperature |
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==Main Points of the Paper == | ==Main Points of the Paper == | ||
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| − | ==Annotations== | + | ==Phenotype Annotations== |
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==Notes== | ==Notes== | ||
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Latest revision as of 17:01, 29 November 2013
| Citation |
Squires, CK and Ingraham, JL (1969) Mutant of Escherichia coli exhibiting a cold-sensitive phenotype for growth on lactose. J. Bacteriol. 97:488-94 |
|---|---|
| Abstract |
As part of a study on the effect of low temperature on cellular regulatory processes, a class of lactose-negative mutants of Escherichia coli K-12 was isolated which could use lactose as a sole carbon and energy source at 37 C, but which could not use this sugar at 20 C. The lactose operon of the mutants functioned normally at 20 C. Galactose exhibited a strong inhibitory effect on growth, especially at 20 C. Growth of the mutants on glycerol was stopped at 20 C and slowed considerably at 37 C if galactose was added to the medium. Making the mutants galactose-positive eliminated the cold sensitivity of lactose utilization. One mutant was shown to be galactose-1-phosphate uridyl transferase-negative, galactose-kinase heat-sensitive, and uridine diphosphate-galactose-4-epimerase-positive. It is postulated that the mutant is able to phosphorylate galactose at 20 C (if only at a very low rate), but lacking transferase it is poisoned by the accumulation of galactose-1-phosphate. At 37 C, galactokinase is nonfunctional and the mutant grows on the glucose moiety of lactose. |
| Links | |
| Keywords |
Enzyme Induction; Escherichia coli/drug effects; Escherichia coli/enzymology; Escherichia coli/metabolism; Galactose/pharmacology; Galactosidases/metabolism; Genetic Complementation Test; Genetics, Microbial; Glucose/metabolism; Lactose/metabolism; Membrane Transport Proteins/metabolism; Molecular Biology; Mutation; Phosphotransferases/metabolism; Temperature |
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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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<protect>
| 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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</protect>
Notes
References
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