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. 1995 Jun;61(6):2224–2229. doi: 10.1128/aem.61.6.2224-2229.1995

Gene cloning, nucleotide sequence, and expression of a cephalosporin-C deacetylase from Bacillus subtilis.

K Mitsushima 1, A Takimoto 1, T Sonoyama 1, S Yagi 1
PMCID: PMC167493  PMID: 7793942

Abstract

The gene encoding a cephalosporin-C deacetylase (CAH) from Bacillus subtilis SHS 0133 was cloned and sequenced. The nucleotide sequence contained an open reading frame encoding a polypeptide consisting of 318 amino acids, the molecular weight of which was in good agreement with the value obtained by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The deduced amino acid sequence contained the common sequence Gly-X-Ser-X-Gly found in many esterases, lipases, and serine proteases. This indicates that CAH is a serine enzyme. A possible promoter sequence which is very similar to the consensus sequences of -35 and -10 regions recognized by B. subtilis RNA polymerase utilizing sigma factor H was found in the 5'-flanking region of the CAH structural gene. Two repeated A+T-rich blocks consisting of 24 bp were also found in the upstream region of the initiation codon. We constructed a series of expression plasmids by inserting the CAH gene into Escherichia coli ATG vectors. The degree of CAH gene expression depended on promoters and vector plasmids, which have different replication origins. The expressed CAH protein was an active form in the soluble fraction obtained after cell disruption. The highest expression level was accomplished with an expression plasmid, pCAH400, which has the trp promoter and the replication origin derived from pAT153. In the fermentation using a 30-liter jar fermentor, the transformant E. coli JM103(pCAH400) produced 440 U of CAH per ml of culture during a 24-h incubation. This value corresponded to 2.1 g of CAH protein in 1 liter of culture broth.

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Selected References

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