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Department of Microbiology, State Key Laboratory for Agrobiotechnology, China Agricultural University, Beijing 100094, China.
A thl gene encoding the thiolase (EC 2.3.1.9) of Clostridium pasteurianum was cloned by thermal asymmetric interlaced (TAIL) PCR. It consists of 1179 bp with 36.8% GC content and encodes 392 amino acids with a deduced molecular mass of 40,954 Da and shows 77% identity and 88% similarity to that of Clostridium tetani E88 and should be classified as a biosynthetic thiolase with three conserved residues Cys89, Cys382 and His352. The gene was over-expressed in Escherichia coli and the thiolase was purified with Ni-NTA agarose column to homogeneity. The K(m) of this thiolase for acetoacetyl-CoA is 0.13 mM with 0.06 mM CoASH at pH 8.2, 25 degrees C and a V(max) value of 46 micromol min(-1) mg(-1).
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