Characterization of a 3-dehydroquinase gene from Actinobacillus pleuropneumoniae with homology to the eukaryotic genes qa-2 and QUTE |
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| Authors: | G. Lalonde P. D. O'Hanley B. A. D. Stacker K. T. Denich |
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| Affiliation: | Departments of Microbiology and Immunology, Stanford University School of Medicine, Stanford, California 94305-5402, USA.;Medicine (infectious Diseases), Stanford University School of Medicine, Stanford, California 94305-5402, USA.;The Medical Service of the Veterans Affairs Medical Center, Palo Alto, California 94304-5402, USA. |
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| Abstract: | A gene was cloned from Actinobacillus pleuropneumoniae strain 4074 by complementation of an aroD strain of Escherichia coli. The E. coli gene aroD codes for a 3-dehydroquinase enzyme of type I, active in the aromatic biosynthesis pathway. The A. pleuropneumoniae gene, termed aroQ, displays no base or ami no acid sequence homoiogy to aroD of E. coli. It is instead homologous to the QUTE and qa-2 genes, respectively of Aspergillus niduians and Neurospora crassa. These genes code for 3-dehydroquinase enzymes of type ii, involved in the catabolism of quinic acid. The 1.6 kb fragment, which includes aroQ, carries four overlapping or adjacent open reading frames: a dapD gene; aroQ; one without homology to sequences in GenBank; and one with homology to the C-terminal 40% of chlN of E. coli. |
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