Molecular characterization of the Entner-Doudoroff pathway in Escherichia coli: sequence analysis and localization of promoters for the edd-eda operon
| Autor: | R. Fliege, Tyrrell Conway, S. E. Egan, Suxiang Tong, R. E. Wolf, Annemarie Shibata |
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| Rok vydání: | 1992 |
| Předmět: |
Transcription
Genetic Operon Sequence analysis Molecular Sequence Data Restriction Mapping Sequence alignment Microbiology Sequence Homology Nucleic Acid Escherichia coli Amino Acid Sequence RNA Messenger Promoter Regions Genetic Molecular Biology Entner–Doudoroff pathway Peptide sequence Hydro-Lyases Aldehyde-Lyases Genetics Base Sequence biology Structural gene Aldolase A Nucleic acid sequence body regions Biochemistry biology.protein Research Article |
| Zdroj: | Journal of Bacteriology. 174:4638-4646 |
| ISSN: | 1098-5530 0021-9193 |
| Popis: | The nucleotide sequence of the entire Escherichia coli edd-eda region that encodes the enzymes of the Entner-Doudoroff pathway was determined. The edd structural gene begins 236 bases downstream of zwf. The eda structural gene begins 34 bases downstream of edd. The edd reading frame is 1,809 bases long and encodes the 602-amino-acid, 64,446-Da protein 6-phosphogluconate dehydratase. The deduced primary amino acid sequences of the E. coli and Zymomonas mobilis dehydratase enzymes are highly conserved. The eda reading frame is 642 bases long and encodes the 213-amino-acid, 22,283-Da protein 2-keto-3-deoxy-6-phosphogluconate aldolase. This enzyme had been previously purified and sequenced by others on the basis of its related enzyme activity, 2-keto-4-hydroxyglutarate aldolase. The data presented here provide proof that the two enzymes are identical. The primary amino acid sequences of the E. coli, Z. mobilis, and Pseudomonas putida aldolase enzymes are highly conserved. When E. coli is grown on gluconate, the edd and eda genes are cotranscribed. Four putative promoters within the edd-eda region were identified by transcript mapping and computer analysis. P1, located upstream of edd, appears to be the primary gluconate-responsive promoter of the edd-eda operon, responsible for induction of the Entner-Doudoroff pathway, as mediated by the gntR product. High basal expression of eda is explained by constitutive transcription from P2, P3, and/or P4 but not P1. |
| Databáze: | OpenAIRE |
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