The gene for new Rhodococcus erythropolis TA37 acylamidase, which possesses unique substrate specificity, has been cloned and expressed in E. coli. Substrates for this enzyme are not only simple amides, such as acetamide and propionamide, but also N-substituted amides, such as 4′-nitroacetanilide. The 1431-bp gene was expressed in E. coli BL21 (DE3) cells on pET16b plasmid under the control of a promoter of the ϕ 10 gene from the T7 phage. The molecular mass of recombinant acylamidase in E. coli was 55 kDa, which corresponded to that of native acylamidase from Rhodococcus erythropolis TA37. Recombinant acylamidase was able to hydrolize N-substituted amides. A search of a nucleotide database and multiple alignment revealed that acylamidase belonged to the Amidase protein family PF01425, but its nucleotide and amino acid sequences differed significantly from those of the described amidases.
Russian Journal of Genetics – Springer Journals
Published: Oct 10, 2013
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