PMID:7541760
| Citation |
Shivapriya, R, Prasad, R, Narayanan, IL, Krishnaswamy, S and Dharmalingam, K (1995) Expression of the mcrA gene of Escherichia coli is regulated posttranscriptionally, possibly by sequestration of the Shine-Dalgarno region. Gene 157:201-7 |
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| Abstract |
The polypeptides encoded by the mcrA gene were analysed using a T7 expression system. Cloned fragments of 1.6 and 1.0 kb displayed an McrA+/RglA+ phenotype and directed synthesis of a 31-kDa polypeptide. A derivative of these clones altered at an internal HindIII site displayed an McrA+/RglA- phenotype and directed production of a 23-kDa polypeptide. Smaller inserts displayed McrA-/RglA- phenotypes, though a 0.7-kb insert did direct production of a 24-kDa polypeptide. A construct carrying the 1.0-kb mcrA insert yielded a single 1.3-kb transcript. The mcrA transcript was found to start from C, G, T and G, namely the fourth, fifth, sixth and seventh nucleotides (nt), respectively, downstream from the last nt of the putative -10 region. Two mcrA transcriptional/transational fusions were made in the pT7-7 expression vector and the protein encoded by these constructs were analysed. Regulation of mcrA expression was studied by quantitative Northern analysis of RNA from various mcrA clones. Together with a computer analysis of the translation initiation region in these mRNAs, the results suggest that the expression of mcrA may be regulated at the translational level. |
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| Keywords |
Bacterial Proteins/biosynthesis; Bacterial Proteins/genetics; Base Sequence; DNA, Bacterial/chemistry; DNA, Bacterial/genetics; DNA, Bacterial/metabolism; Escherichia coli/genetics; Escherichia coli/metabolism; Frameshift Mutation; Gene Expression Regulation, Bacterial; Genes, Bacterial; Models, Structural; Molecular Sequence Data; Nucleic Acid Conformation; Oxidoreductases; Phenotype; Plasmids; RNA, Bacterial/biosynthesis; RNA, Bacterial/isolation & purification; Restriction Mapping; Transcription, Genetic |
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