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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

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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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Correspondence to S. V. Belenkaya.

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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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