Abstract
The non-haem chloroperoxidase gene (cpoF) from the pyrrolnitrin producer
Pseudomonas fluorescens BL914 was cloned using an oligonucleotide
derived from part of the N-terminal amino acid sequence of chloroperoxidase
(CPO-P) from Pseudomonas pyrrocina as a probe. Based on the overexpression
of cpoF in Escherichia coli and the stability of CPO-F against higher
temperatures and proteases, the enzyme was purified to homogeneity.
Partial characterization of the enzyme showed that it belongs to
the class of bacterial non-haem CPOs. To investigate the role of
CPO-F in pyrrolnitrin biosynthesis, the cpoF gene was inactivated
by insertion of a kanamycin cassette. Exchange of the chromosomal
cpoF gene against the disrupted copy had no influence on pyrrolnitrin
production demonstrating that CPO-F was not involved in pyrrolnitrin
biosynthesis.
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