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Ten different strains of Thermomyces lanuginosus , isolated from composting soils were found to produce phytase when grown on PSM medium. The wild type strain CM was found to produce maximum amount of phytase (4.33 units/g DW substrate). Culturing T. lanuginosus strain CM on medium containing wheat bran and optimizing other culture conditions (carbon source, media type, nitrogen source, level of nitrogen, temperature, pH, inoculum age, inoculum level and moisture), increased the phytase yield to 13.26 units/g substrate. This culture was further subjected to UV mutagenesis for developing phytase hyperproducing mutants. The mutant (TL-7) showed 2.29-fold increase in phytase activity as compared to the parental strain. Employing Box-Behnken factor factorial design of response surface methodology resulted in optimized phytase production (32.19 units/g of substrate) by mutant TL-7. A simple two-step purification (40.75-folds) of phytase from mutant TL-7 was achieved by anion exchange and gel filtration chromatography. The purified phytase (∼54 kDa) was characterized to be optimally active at pH 5.0 and temperature 70 °C, though the enzyme showed ∼70% activity over a wide pH and temperature range (2.0–10.0 and 30–90 °C, respectively). The phytase showed broad substrate specificity with activity against sodium phytate, ADP and riboflavin phosphate. The phytase from T. lanuginosus was thermoacidstable as it showed up to 70% residual activity after exposure to 70 °C at pH 3.0 for 120 min. The enzyme showed K m 4.55 μM and V max 0.833 μM/min/mg against sodium phytate as substrate.

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680 685 El-Shafei, H. A., Rezkallah, L. A.: Production, purification and characterization of Bacillus lipase. Microbiol. Res. 52 , 199–208 (1997

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Sharma, R., Chisti, Y., Banerjee, U.: Production, purification, and characterization and application of lipases. Biotechnol Adv 19 , 627–667 (2001). Banerjee U. Production

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Kumar, S., Kikon, K., Upadhyay, A., Kanwar, S. S., Gupta, R.: Production, purification and characterization of lipase from thermophilic and alkaliphilic Bacillus coagulans BTS-3. Protein Expression and Purification 41 , 38-44 (2005

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Science 1249 1251 Hiol, A., Donzo, M. D., Druet, D., Comeau, L.: Production, purification and characterization of an extracellular lipase from Mucor

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, purification and characterization of polygalacturonase from Mucor circinelloides ITCC 6025. Enzyme Res. 2010 , 1–7 (2010). Gupta R. Production, purification and characterization of

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337 343 Kotwal, S. M., Gote, M. M., Khan, M. I., Khire, J. M. (1999) Production, purification and characterization of a constitutive intracellular α-galactosidase from the

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, purification and characterization of Bacillus lipase. Microbiol. Res. 152 , 199–208. Rezkallah L. A. Production, purification and characterization of Bacillus lipase

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. 21. Muthulakshmi , C. , Gomathi , D. , Kumar , D. G. , Ravikumar , G. , Kalaiselvi , M. , Uma , C. ( 2011 ) Production, purification and characterization of protease by Aspergillus

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, A., Pahwa, R., Singh, S., Gupta, R.: Production, purification and characterization of polygalacturonase from Mucor circinelloides ITCC 6025. Enzyme Res 2010, doi: 10,4061/2010/170549 (2010). Martins, E. S

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