[Objective] The aim of this study was to purify and characterize a dual-domain β-propeller alkaline phytase(phy HT) from Bacillus sp.HJB17 and to analyze the sequence features for application of the enzyme.[Methods] The amino acid sequence of phy HT was analyzed by bioinformatics methods.Phy HT protein was expressed,refolded,purified and the enzymatic properties were determined by ferrous sulfate and molybdenum blue method.[Results] Sequence analysis suggested that phy HT consisted of 633 amino acids and co...