Abstract
A producer strain of Komagataella phaffii of recombinant beluga whale (Delphinapterus leucas) chymosin with a productivity of 80 mg/L was obtained, and the physico-chemical properties of the enzyme were studied for possible use in the food industry. The specific activity of the recombinant beluga chymosin was 55 IMCU/mg, which is significantly lower than that of recombinant bovine chymosin. The beluga whale chymosin has a high nonspecific proteolytic activity, which impaired its properties and ruled out its used in the food industry. Apparently, the amino acid substitutions K221M and K294Q are critically important and lead to a lower binding of casein micelles to the recombinant chymosin of the beluga whale.
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ACKNOWLEDGMENTS
This study was performed at the facilities of the Industrial Biotechnologies Center for Collective Use of the Fundamentals of Biotechnology Federal Research Center of the Russian Academy of Sciences.
Funding
This study was supported by the Ministry of Science and Higher Education of the Russian Federation, the agreement of November 26, 2018, No. 14.607.21.0207 (unique identifier RFMEFI60718X0207), the Federal Target Program “Research and Development in Priority Areas of the Scientific-Technological Complex of Russia for 2014–2020.”
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Translated by M. Novikova
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Filkin, S.Y., Chertova, N.V., Zatsepin, S.S. et al. Production of Beluga Whale (Delphinapterus leucas) Chymosin in the Methylotrophic Yeast Komagataella phaffii and Characteristics of the Recombinant Enzyme. Appl Biochem Microbiol 57, 297–302 (2021). https://doi.org/10.1134/S0003683821030029
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DOI: https://doi.org/10.1134/S0003683821030029