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A heterologous expression of alpha-amino acid ester hydrolase from the strain Achromobacter sp. CCM 4824 in Escherichia coli BL21(DE3)
 Schneiderová, Michaela ; Kyslík, Pavel (advisor) ; Lichá, Irena (referee)
On the chromosomal DNA of the microorganism Achromobacter sp. CCM 4824, which was gained in the Laboratory of enzyme technology MBU AVCR v.v.i., there was identified a gene coding an enzyme capable of hydrolyzation of semi-synthetic β-lactam antibiotics ampicillin and cephalosporin with a D-phenylglycine as a side chain. This enzyme belongs to a group of α-amino acid esterases, which are interesting because of a potential use in kinetically controled synthesis of β-lactam antibiotics. In several aspects α-amino acid esterases might be better than actually used penicillin acylases and that is why these enzymes are subjects of a big interest. The gene for α-amino acid esterase coded by chromosomal DNA was cloned, characterized and heterologously expressed in constructed highly-producing bacterial system Escherichia coli BL21(DE3)JM5. Produced enzyme was purified and its properties important for possible use in the production of semi-synthetic β-lactam antibiotics were determined. Key words: alpha-amino acid ester hydrolase, Achromobacter sp., recombinant expression system, β-lactam antibiotics
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