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The Bacillus pumilus gene encoding acetyl xylan esterase (axe) was identified and characterized. The axe gene was expressed and the recombinant enzyme produced in Escherichia coli was purified and characterized. The recombinant enzyme displayed similar properties to the acetyl xylan esterase (AXE) purified from B. pumilus. The AXE primary structure was 76% identical to the cephalosporin C deacetylase of B. subtilis, and 40% to two recently identified AXEs from Thermoanaerobacterium and Thermotoga maritima. These four proteins are of similar size and represent a new family of esterases having a broad substrate specificity. The recombinant AXE was demonstrated to have activity on several acetylated substrates, including on cephalosporin C.

microbiology

The acetyl xylan esterase of Bacillus pumilus belongs to a family of esterases with broad substrate specificity The GenBank/EMBL/DDBJ accession number for the sequence reported in this paper is AJ249957.