PMID:1702779: Difference between revisions
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!align=left |Citation | |||
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'''Olson, ER, Dunyak, DS, Jurss, LM and Poorman, RA''' (1991) Identification and characterization of dppA, an Escherichia coli gene encoding a periplasmic dipeptide transport protein. ''J. Bacteriol.'' '''173''':234-44 | |||
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!align=left |Abstract | |||
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We describe the isolation and analysis of an Escherichia coli gene, dppA, and its role in dipeptide transport. dppA maps near min 79 and encodes a protein (DppA) that has regions of amino acid similarity with a peptide-binding protein from Salmonella typhimurium (OppA). Like OppA, DppA is found in the periplasmic space and thus is most likely a dipeptide-binding protein. Insertional inactivation of dppA results in the inability of a proline auxotroph to utilize Pro-Gly as a proline source. dppA-dependent Pro-Gly utilization does not require any of the three major proline transport systems, demonstrating that DppA is not simply a dipeptidase. An in vivo competition assay was used to show that DppA is probably involved in the transport of dipeptides other than Pro-Gly. Transcription of dppA is repressed by the presence of casamino acids, suggesting that the cell alters its dipeptide transport capabilities in response to an environmental signal. | |||
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[http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=1702779 PubMed] [http://www.ncbi.nlm.nih.gov/pmc/articles/PMC207180 PMC207180] | |||
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| | !align=left |Keywords | ||
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|- | Amino Acid Sequence; Bacterial Proteins/genetics; Bacteriophage lambda/genetics; Base Sequence; Biological Transport; Blotting, Northern; Carrier Proteins/genetics; DNA, Bacterial/genetics; DNA, Bacterial/isolation & purification; Escherichia coli/genetics; Escherichia coli/growth & development; Escherichia coli Proteins; Genes, Bacterial; Membrane Transport Proteins/genetics; Molecular Sequence Data; Nucleic Acid Hybridization; Oligonucleotide Probes; Periplasmic Binding Proteins; Plasmids; RNA, Bacterial/genetics; RNA, Bacterial/isolation & purification; Restriction Mapping; Sequence Homology, Nucleic Acid | ||
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==Significance {{HelpIcon|Help:Literature}} == | ==Significance {{HelpIcon|Help:Literature}} == | ||
{{LitSignificance}} | {{LitSignificance}} | ||
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==Annotations {{HelpIcon|Help:Literature}}== | ==Annotations {{HelpIcon|Help:Literature}}== | ||
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==EcoliWiki Links {{HelpIcon|Help:Literature}} == | ==EcoliWiki Links {{HelpIcon|Help:Literature}} == | ||
Latest revision as of 04:30, 15 September 2013
| Citation |
Olson, ER, Dunyak, DS, Jurss, LM and Poorman, RA (1991) Identification and characterization of dppA, an Escherichia coli gene encoding a periplasmic dipeptide transport protein. J. Bacteriol. 173:234-44 |
|---|---|
| Abstract |
We describe the isolation and analysis of an Escherichia coli gene, dppA, and its role in dipeptide transport. dppA maps near min 79 and encodes a protein (DppA) that has regions of amino acid similarity with a peptide-binding protein from Salmonella typhimurium (OppA). Like OppA, DppA is found in the periplasmic space and thus is most likely a dipeptide-binding protein. Insertional inactivation of dppA results in the inability of a proline auxotroph to utilize Pro-Gly as a proline source. dppA-dependent Pro-Gly utilization does not require any of the three major proline transport systems, demonstrating that DppA is not simply a dipeptidase. An in vivo competition assay was used to show that DppA is probably involved in the transport of dipeptides other than Pro-Gly. Transcription of dppA is repressed by the presence of casamino acids, suggesting that the cell alters its dipeptide transport capabilities in response to an environmental signal. |
| Links | |
| Keywords |
Amino Acid Sequence; Bacterial Proteins/genetics; Bacteriophage lambda/genetics; Base Sequence; Biological Transport; Blotting, Northern; Carrier Proteins/genetics; DNA, Bacterial/genetics; DNA, Bacterial/isolation & purification; Escherichia coli/genetics; Escherichia coli/growth & development; Escherichia coli Proteins; Genes, Bacterial; Membrane Transport Proteins/genetics; Molecular Sequence Data; Nucleic Acid Hybridization; Oligonucleotide Probes; Periplasmic Binding Proteins; Plasmids; RNA, Bacterial/genetics; RNA, Bacterial/isolation & purification; Restriction Mapping; Sequence Homology, Nucleic Acid |
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