Abstract
In order to improve the thermostability of Escherichia coli AppA phytase, Error-prone PCR was used to randomize mutagenesis appA gene, and a gene mutation library was constructed. A mutant I408L was selected from the library by the method of high-throughput screening with 4-methyl-umbelliferylphosphate (4-MUP). The appA gene of the mutant was cloned and expressed in E. coli Origami (DE3). The recombinant protein was purified by Ni-affinity chromatography, and the enzymatic features were analyzed. The results indicated that AppA phytase activities of mutant I408L and wild-type (WT) strain remained at 51.3 and 28%, respectively, after treatment at 85°C for 5 min. It means that the thermostability enhancement of AppA phytase I408L was 23.3% more as compared with WT. The K m of both phytase were 0.18 and 0.25 mM, respectively, which indicated that the catalyzing efficiency of I408L was improved. AppA phytase of mutant I408L showed a significant enhancement against trypsin, which was nearly three times compared with WT. In addition, AppA phytase of mutant could be activated by Mg2+ and Mn2+; in contrast, it could be inhibited by Ca2+, Co2+, Cu2+, and K+ in varying degrees, and the enzymatic activity was almost lost the presence of Fe3+ and Zn2+. It appears that screening thermotolerant phytase of E. coli by high throughput screening with a fluorescence substrate is a fast, simple, and effective method. The mutant I408L obtained in this study could be used for the large-scale commercial production of phytase.
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Haefner S, Knietsch A, Scholten E, Braun J, Lohscheidt M, Zelder O (2005) Biotechnological production and applications of phytases. Appl Microbiol Biotechnol 68(5):588–597
Selle PH, Aaron J, Cowieson AJ, Ravindran V (2009) Consequences of calcium interactions with phytate and phytase for poultry and pigs. Livestock Sci 124(1–3):126–141
Lei XG, Stahl CH (2001) Biotechnological development of effective phytases for mineral nutrition and environmental protection. Appl Microbiol Biotechnol 57(4):474–481
Wyss M, Brugger R, Kronenberger A, Remy R, Fimbel R, Oesterhelt G, Lehmann M, van Loon AP (1999) Biochemical characterization of fungal phytases (myo-inositol hexakisphosphate phosphohydrolases): catalytic properties. Appl Environ Microbiol 65(2):367–373
Luo H, Huang H, Yang P, Wang Y, Yuan T, Wu N, Yao B, Fan Y (2007) A novel phytase appA from Citrobacter amalonaticus CGMCC 1696: gene cloning and overexpression in Pichia pastoris. Curr Microbiol 55(3):185–192
Chen KQ, Arnold FH (1991) Enzyme engineering for nonaqueous solvents: random mutagenesis to enhance activity of subtilisin E in polar organic media. Biotechnology 9(11):1073–1077
Stemmer WPC (1994) Rapid evolution of a protein in vitro by DNA shuffling. Nature 370(4):389–391
Fisch I, Kontermann RE, Finnern R, Hartley O, Soler-Gonzalez AS, Griffiths AD, Winter G (1996) A strategy of exon shuffling for making large peptide repertoires displayed on filamentous bacteriophage. Proc Natl Acad Sci USA 93(15):7761–7766
Zhao H, Giver L, Shao Z, Affholter JA, Arnold FH (1998) Molecular evolution by staggered extension process (StEP) in vitro recombination. Nat Biotechnol 16(3):258–261
Rodriguez E, Wood ZA, Karplus PA, Lei XG (2000) Site-directed mutagenesis improves catalytic efficiency and thermostability of Escherichia coli pH 2.5 acid phosphatase/phytase expressed in Pichia pastoris. Arch Biochem Biophys 382(1):105–112
Garrett JB, Kretz KA, Donoghue EO, Kerovuo J, Kim W, Barton NR, Hazlewood GP, Short JM, Robertson DE, Gray KA (2004) Enhancing the thermal tolerance and gastric performance of a microbial phytase for use as a phosphate-mobilizing monogastric-feed supplement. Appl Environ Microbiol 70(5):3041–3046
Kim MS, Lei XG (2008) Enhancing thermostability of Escherichia coli phytase AppA2 by error-prone PCR. Appl Microbiol Biotechnol 79(1):69–75
Bradford MM (1976) A rapid and sensitive method for the quantitation of microgram quantities of protein utilizing the principle of protein-dye binding. Anal Biochem 72:248–254
Kikuchi M, Ohnishi K, Harayama S (1999) An effective family shuffling method using single-stranded DNA. Gene 243(1–2):133–137
Declerck N, Machius M, Wiegand G, Huber R, Gaillardin C (2000) Probing structural determinants specifying high thermostability in Bacillus licheniformis α-amylase. J Mol Biol 301(4):1041–1057
Giver L, Gershenson A, Freskgard PO, Arnold FH (1998) Directed evolution of a thermostable esterase. Proc Natl Acad Sci USA 95(22):12809–12813
Zhao H, Arnold FH (1999) Directed evolution converts subtilisin E into a functional equivalent of thermitase. Protein Eng 12(1):47–53
Toyama H, Toyama N (1999) Construction of cellulase hyperproducing strains derived from polyploids of Trichoderma reesei. Microbios 100(395):7–18
Shibuya H, Kaneko S, Hayashi K (2000) Enhancement of the thermostability and hydrolytic activity of xylanase by random gene shuffling. Biochem J 349(2):651–656
Ragon M, Neugnot-Roux V, Chemardin P, Moulin G, Boze H (2008) Molecular gene cloning and overexpression of the phytase from Debaryomyces castellii CBS 2923. Protein Expr Purif 58(2):275–283
Li X, Liu Z, Chi Z, Li J, Wang X (2009) Molecular cloning, characterization, and expression of the phytase gene from marine yeast Kodamaea ohmeri BG3. Mycol Res 113(1):24–32
Ullah AH, Gibson DM (1988) Purification and characterization of acid phosphatase from cotyledons of germinating soybean seeds. Arch Biochem Biophys 260(2):514–520
Casey A, Walsh G (2003) Purification and characterization of extracellular phytase from Aspergillus niger ATCC 9142. Bioresour Technol 86(2):183–188
Singh B, Satyanarayana T (2008) Improved phytase production by a thermophilic mould Sporotrichum thermophile in submerged fermentation due to statistical optimization. Bioresour Technol 99(4):824–830
Wodzinski RJ, Ullah AH (1996) Phytase. Adv Appl Microbiol 42:263–302
Rodriguez E, Porres JM, Han Y, Lei XG (1999) Different sensitivity of recombinant Aspergillus niger phytase (r-PhyA) and Escherichia coli pH 2.5 acid phosphatase (r-AppA) to trypsin and pepsin in vitro. Arch Biochem Biophys 365(2):262–267
Dharmsthiti S, Chalermpornpaisarn S, Kiatiyajarn M, Chanpokapaiboon A, Klongsithidej Y, Techawiparut J (2005) Phytase production from Pseudomonas putida harbouring Escherichia coli appA. Process Biochem 40(2):789–793
Acknowledgments
This study was supported by The National Natural Science Foundation of China (30871321, 30771312, and 30971817), The National Special Basic Research Projects of China (SB2007FY400-4), and The National Basic Research Program of China (2009CB125910).
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Zhu, W., Qiao, D., Huang, M. et al. Modifying Thermostability of appA from Escherichia coli . Curr Microbiol 61, 267–273 (2010). https://doi.org/10.1007/s00284-010-9606-5
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DOI: https://doi.org/10.1007/s00284-010-9606-5