Abstract
For the first time, the chymosin gene (CYM) of a maral was characterized. Its exon/intron organization was established using comparative analysis of the nucleotide sequence. The CYM mRNA sequence encoding a maral preprochymosin was reconstructed. Nucleotide sequence of the CYM maral mRNA allowed developing an expression vector to ensure production of a recombinant enzyme. Recombinant maral prochymosin was obtained in the expression system of Escherichiacoli [strain BL21 (DE3)]. Total milk-coagulation activity (MCA) of the recombinant maral chymosin was 2330 AU/ml. The recombinant maral prochymosin relative activity was 52955 AU/mg. The recombinant maral chymosin showed 100-81% MCA in the temperature range 30-50°C, thermal stability (TS) threshold was 50°C, and the enzyme was completely inactivated at 70°C. Preparations of the recombinant chymosin of a single-humped camel and recombinant bovine chymosin were used as reference samples. Michaelis–Menten constant (Km), turnover number (kcat), and catalytic efficiency (kcat/Km) of the recombinant maral chymosin, were 1.18 ± 0.1 µM, 2.68 ± 0.08 s−1 and 2.27± 0.10 µm M−1·s−1, respectively.
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Abbreviations
- Chn:
-
rChn, chymosin and recombinant chymosin
- CYM :
-
chymosin gene
- κ-CS:
-
κ-casein
- ME:
-
milk-clotting enzyme
- MEP:
-
milk-clotting enzyme preparation
- rProChn:
-
recombinant prochymosin
- rChn Bos:
-
recombinant bovine chymosin
- rChn Cam:
-
recombinant single-humped camel chymosin
- TS:
-
thermal stability
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Acknowledgements
The authors are grateful to the Genomics Core Facility (ICBFM SB) of the Siberian Branch of the Russian Academy of Sciences for DNA sequencing.
Funding
The work was financially supported by the Ministry of Science and Higher Education of the Russian Federation (project No. FZMW-2020-0002 “Development of recombinant enzyme producers for cheese making”).
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The authors declare no conflict of interests in financial or any other sphere. All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.
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Belenkaya, S., Bondar, A., Kurgina, T. et al. Characterization of the Altai Maral Chymosin Gene, Production of a Chymosin Recombinant Analog in the Prokaryotic Expression System, and Analysis of Its Several Biochemical Properties. Biochemistry Moscow 85, 781–791 (2020). https://doi.org/10.1134/S0006297920070068
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DOI: https://doi.org/10.1134/S0006297920070068