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- W1567697522 abstract "The gene encoding cyclohexadienyl dehydratase (denoted pheC) was cloned from Pseudomonas aeruginosa by functional complementation of a pheA auxotroph of Escherichia coli. The gene was highly expressed in E. coli due to the use of the high-copy number vector pUC18. The P. aeruginosa cyclohexadienyl dehydratase expressed in E. coli was purified to electrophoretic homogeneity. The latter enzyme exhibited identical physical and biochemical properties as those obtained for cyclohexadienyl dehydratase purified from P. aeruginosa. The activity ratios of prephenate dehydratase to arogenate dehydratase remained constant (about 3.3-fold) throughout purification, thus demonstrating a single protein having broad substrate specificity. The cyclohexadienyl dehydratase exhibited Km values of 0.42 mM for prephenate and 0.22 mM for L-arogenate, respectively. The pheC gene was 807 base pairs in length, encoding a protein with a calculated molecular mass of 30,480 daltons. This compares with a molecular mass value of 29.5 kDa determined for the purified enzyme by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Since the native molecular mass determined by gel filtration was 72 kDa, the enzyme probably is a homodimer. Comparison of the deduced amino acid sequence of pheC from P. aeruginosa with those of the prephenate dehydratases of Corynebacterium glutamicum, Bacillus subtilis, E. coli, and Pseudomonas stutzeri by standard pairwise alignments did not establish obvious homology. However, a more detailed analysis revealed a conserved motif (containing a threonine residue known to be essential for catalysis) that was shared by all of the dehydratase proteins." @default.
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- W1567697522 date "1992-02-01" @default.
- W1567697522 modified "2023-09-29" @default.
- W1567697522 title "Cyclohexadienyl dehydratase from Pseudomonas aeruginosa. Molecular cloning of the gene and characterization of the gene product." @default.
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- W1567697522 doi "https://doi.org/10.1016/s0021-9258(18)45905-4" @default.
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