PMID:3536852
| Citation |
Dila, DK and Maloy, SR (1986) Proline transport in Salmonella typhimurium: putP permease mutants with altered substrate specificity.J. Bacteriol. 168:590-4 |
|---|---|
| Abstract |
The putP gene encodes a proline permease required for Salmonella typhimurium LT2 to grow on proline as the sole source of nitrogen. The wild-type strain is sensitive to two toxic proline analogs (azetidine-2-carboxylic acid and 3,4-dehydroproline) also transported by the putP permease. Most mutations in putP prevent transport of all three substrates. Such mutants are unable to grow on proline and are resistant to both of the analogs. To define domains of the putP gene that specify the substrate binding site, we used localized mutagenesis to isolate rare mutants with altered substrate specificity. The position of the mutations in the putP gene was determined by deletion mapping. Most of the mutations are located in three small (approximately 100-base-pair) deletion intervals of the putP gene. The sensitivity of the mutants to the proline analogs was quantitated by radial streaking to determine the affinity of the mutant permeases for the substrates. Some of the mutants showed apparent changes in the kinetics of the substrates transported. These results indicate that the substrate specificity mutations are probably due to amino acid substitutions at or near the active site of proline permease. |
| Links | |
| Keywords |
Amino Acid Transport Systems, Neutral; Azetidinecarboxylic Acid; Binding Sites; Biological Transport, Active; Chromosome Deletion; Chromosome Mapping; Genes, Bacterial; Kinetics; Membrane Transport Proteins; Mutation; Proline; Salmonella typhimurium; Substrate Specificity |
| edit table |
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 |
|---|---|---|---|---|---|---|---|---|---|
| edit table |
</protect>
Notes
References
See Help:References for how to manage references in omp dev.
