Abstract
L-asparaginase is an important therapeutic biomolecule, used to treat lymphocytic leukemia. In the present study, Iodobacter sp. PCH194 genome was mined for new L-asparaginase (Id-ASNase II). In silico analysis including amino acid composition and pI revealed its sequence-based novelty and phylogenetic closeness to the commercial bacterial L-asparaginases. Subsequently, the gene was successfully cloned and overexpressed in Escherichia coli (E. coli BL21 DE3). The monomeric molecular weight of Id-ASNase II was 38 kDa with a native size of 150 kDa. Maximum L-asparaginase activity (80 U mg− 1) was achieved in 25 mM Tris-HCl buffer (pH 8.2) at 37 °C after 10 min of incubation. The enzyme was active in wide pH (5.0–11.0) and temperature ranges (4–70 °C). The half-life (t1/2) of the enzyme at 37 °C was 13.54 h, whereas Km, Vmax, kcat, and kcat/Km were 1.2 mM, 128 µmoles min− 1, 82 s− 1, and 63.1 s− 1 mM− 1, respectively. Id-ASNase II exhibited cytotoxicity against cancer cell line K562 (IC50 value 0.4 U mL− 1) leading to cell cycle arrest in the G2/M phase after treatment. Furthermore, 10 U Id-ASNase II led to a 57% acrylamide reduction in potato chips. Thus, the study discovered and characterized Id-ASNase II with potential applications for treating leukemia and food processing.
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Abbreviations
- Id-ASNase II :
-
Iodobacter L-asparaginase type-II
- ALL:
-
Acute lymphoblastic leukemia
- PCR:
-
Polymerase chain reaction
- IPTG:
-
Isopropyl-β-D-1-thiogalactopyranoside
- CFE:
-
Cell-free extract
- DMEM:
-
Dulbecco’s modified eagle’s medium
- MTT:
-
3-(4,5-dimethyl-2-thiazolyl)-2,5- diphenyl-2-tetrazolium bromide
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Acknowledgements
Department of Health Research (DHR) and Indian Council of Medical Research (ICMR), New Delhi is duly acknowledged for the Young Scientist award (grant number 12014/25/2020-HR) to Vr. K and Senior Research Fellowship to VP & SK. SD and VT duly acknowledge for Senior Research Fellowship from the Council of Scientific and Industrial Research (CSIR), New Delhi. VK also duly acknowledges DST, New Delhi, for the Young Scientist award. Authors duly acknowledge Dr. Y S Padwad for extending animal cell culture support. DS gratefully acknowledges financial support from CSIR, New Delhi, for research grants MLP0125 & 130. This manuscript represents CSIR-IHBT publication number 5031.
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Virender Kumar: Conceived and designed the experiments, performed experiments, data curation, formal analysis, and writing-original draft. Sanyukta Darnal: Cell cytotoxicity analysis and writing. Vijeta Patial: Food application and writing, data curation. Subhash Kumar: Homology modeling and docking. Vikas Thakur: Formal analysis, data curation, writing. Vijay Kumar: Genome mining, formal analysis, editing. Dharam Singh: Conceptualization, methodology, formal analysis, supervision, resources, visualization, writing review and editing.
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Kumar, V., Darnal, S., Patial, V. et al. Biochemical characterization of genome derived L-asparaginase from eurypsychrophilic Iodobacter sp. PCH194 for therapeutic and food applications. Biologia 79, 1525–1537 (2024). https://doi.org/10.1007/s11756-024-01624-6
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DOI: https://doi.org/10.1007/s11756-024-01624-6