Abstract
l-Asparaginase is employed in leukaemic treatment and in processing starchy foods. The in silico analysis of Lactobacillus reuteri DSM 20016 reveals the presence of an l-asparaginase gene with theoretical pI value of 4.99. 3D structure prediction was carried out and one model was selected based on the validation scores of 86.293 for ERRAT, 92.10% for VERIFY 3D and Ramachandran plot. Multiple sequence alignment of the protein sequences of l-asparaginases I and II of Escherichia coli, Erwinia chrysanthemum and Homo sapiens shows their sequence similarity. The ORF LREU_RS09880 from L. reuteri DSM 20016 genome was cloned and expressed in E. coli. The recombinant protein was purified to homogeneity using Ni-NTA chromatography and showed higher substrate specificity for l-asparagine. Kinetic parameters like Km and Vmax of recombinant l-asparaginase were calculated as 0.3332mM, 14.06mM/min, respectively. Temperature and pH profile of recombinant l-asparaginase were analysed and maximum activity was found between 30 and 40°C and at pH 6. The recombinant enzyme was thermally stable up to 24h at 28°C. Recombinant l-asparaginase has a recovery percentage of 92 and 10.5 fold purification. HPLC-MS-MS and SDS-PAGE analysis of the purified protein indicated a molecular weight of 35kDa as a monomer.
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