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The amidase gene from Rhodococcus rhodochrous M8 was cloned by PCR amplification with primers developed by use of peptide amino acid sequences obtained after treating amidase with trypsin. Nucleotide sequence analysis of this gene revealed high homology with aliphatic amidases from R. erythropolis R312 and Pseudomonas aeruginosa. Considering the substrate specificity and the results of DNA analysis, amidase from R. rhodochrous M8 was assigned to the group of aliphatic amidases preferentially hydrolyzing short-chain aliphatic amides. The amidase gene was expressed in cells of Escherichia coli from the self promoter and from the lac promoter. To clone a fragment of R. rhodochrous M8 chromosome (approximately 9 kb), containing the entire structural gene and its flanking regions, plasmid pRY1 that can be integrated into the chromosome via homology regions was used. No sequences of the nitrile hydratase gene, the second key gene of nitrile degradation in strain R. rhodochrous M8, were detected. Thus, genes encoding amidase and nitrile hydratase in strain R. rhodochrous M8 are not organized into a single operon despite their common regulation.
Russian Journal of Genetics – Springer Journals
Published: Aug 17, 2006
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