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KMID : 0545120200300071104
Journal of Microbiology and Biotechnology
2020 Volume.30 No. 7 p.1104 ~ p.1107
Effect of Polar Amino Acid Residue Substitution by Site-Directed Mutagenesis in the N-terminal Domain of Pseudomonas sp. Phytase on Enzyme Activity
Lee Ga-Hye

Jang Won-Je
Kim So-Yeong
Kim Yoon-Ha
Kong In-Soo
Abstract
The N-terminal domain of the Pseudomonas sp. FB15 phytase increases low-temperature activity and catalytic efficiency. In this study, the 3D structure of the N-terminal domain was predicted and substitutions for the amino acid residues of the region assumed to be the active site were made. The activity of mutants, in which alanine (A) was substituted for the original residue, was investigated at various temperatures and pH values. Significant differences in enzymatic activity were observed only in mutant E263A, suggesting that the amino acid residue at position 263 of the N-terminal domain is important in enzyme activity.
KEYWORD
Beta-propeller phytase, alkaline phytase, site-directed mutagenesis, phytate
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