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  • Title: Molecular and biochemical characterization of a new alkaline β-propeller phytase from the insect symbiotic bacterium Janthinobacterium sp. TN115.
    Author: Zhang R, Yang P, Huang H, Yuan T, Shi P, Meng K, Yao B.
    Journal: Appl Microbiol Biotechnol; 2011 Oct; 92(2):317-25. PubMed ID: 21562981.
    Abstract:
    A phytase-encoding gene (phyA115) was cloned from Janthinobacterium sp. TN115, a symbiotic bacterial strain isolated from the gut contents of Batocera horsfieldi larvae (Coleoptera: Cerambycidae), and expressed in Escherichia coli. The 1,884-bp full-length gene encodes a 28-residue putative signal peptide and a 599-residue mature protein with a calculated mass of 64 kDa. The deduced PhyA115 shares low identity with known sequences (47% at most) and contains an N-terminal incomplete domain (residues 29-297; domain N) and a typical β-propeller phytase domain at the C terminus (residues 298-627; domain C). Distinct from other β-propeller phytases that have neutral pH optima (pH 6.0-7.5), purified recombinant PhyA115 exhibits maximal activity at pH 8.5 and 45°C in the presence of 1 mM Ca(2+) and is highly active over a wider pH range (pH 6.0-9.0). These results indicate that PhyA115 is a β-propeller phytase that has application potential in aquaculture feed. To our knowledge, this is the first report of cloning of a phytase gene from the symbiotic microbes of an insect digestive tract and from the genus Janthinobacterium. The N-terminal incomplete domain is found to have no phytase activity but can influence the pH property of PhyA115.
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