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Appl Environ Microbiol, June 1998, p. 2079-2085, Vol. 64, No. 6
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Isolation, Characterization, Molecular Gene Cloning, and Sequencing of a Novel Phytase from Bacillus subtilis

Janne Kerovuo,1,* Marko Lauraeus,1 Päivi Nurminen,1 Nisse Kalkkinen,2 and Juha Apajalahti1

Cultor Corporation Technology Center, Kantvik,1 and Institute of Biotechnology, University of Helsinki, Helsinki,2 Finland

Received 9 December 1997/Accepted 5 April 1998

The Bacillus subtilis strain VTT E-68013 was chosen for purification and characterization of its excreted phytase. Purified enzyme had maximal phytase activity at pH 7 and 55°C. Isolated enzyme required calcium for its activity and/or stability and was readily inhibited by EDTA. The enzyme proved to be highly specific since, of the substrates tested, only phytate, ADP, and ATP were hydrolyzed (100, 75, and 50% of the relative activity, respectively). The phytase gene (phyC) was cloned from the B. subtilis VTT E-68013 genomic library. The deduced amino acid sequence (383 residues) showed no homology to the sequences of other phytases nor to those of any known phosphatases. PhyC did not have the conserved RHGXRXP sequence found in the active site of known phytases, and therefore PhyC appears not to be a member of the phytase subfamily of histidine acid phosphatases but a novel enzyme having phytase activity. Due to its pH profile and optimum, it could be an interesting candidate for feed applications.

* Corresponding author. Mailing address: Cultor Corporation Technology Center, FIN-02460 Kantvik, Finland. Phone: 358 9 2974694. Fax: 358 9 2982203. E-mail: janne.kerovuo{at}cultor.com.

Appl Environ Microbiol, June 1998, p. 2079-2085, Vol. 64, No. 6
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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