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Genetic Inactivation of D-Amino Acid Oxidase Genes in Methylotrophic Yeast Hansenula Polymorpha

Авторы: Liu W., Eldarov M.A., Shutova V.V., Maksimov G.V. Опубликовано: 13.12.2021
Опубликовано в выпуске: #6(99)/2021  
DOI: 10.18698/1812-3368-2021-6-110-120

 
Раздел: Химия | Рубрика: Биоорганическая химия  
Ключевые слова: D-amino acid oxidase (DAAO), Hansenula polymorpha knockout, D-alanine, L-alanine, glycerol, methanol

Cellular D-amino acid oxidases (ODA-FAD containing flavoproteins) are widely used in biotechnology. In this regard, it is of particular interest to investigate the functional role of the composition and regulation of individual ODA genes. The aim of this work was to investigate physiological and biochemical characteristics of ODA genes of strain DL1x Hansenula (O.) polymorpha in vivo using gene knockout methodology as well as to determine the nature of these genes expression and regulation of ODA activity as a function of nitrogen and carbon source composition in the cultivation medium. H. polymorpha is a thermotolerant methylotrophic yeast. They are used to study the mechanisms of peroxisomal biogenesis and degradation, regulation of methanol metabolism, nitrate assimilation and stress response. A serial dilution method has been used for rapid assessment of strain growth and stress tolerance. Vector design for genetic inactivation of ODA genes in H. polymorpha was performed using yeast vector pAM773. Selection of "knockout" cell clones was performed using PCR analysis. To complete the transformation process, H. polymorpha was deleted from the pAM773 vector and the obtained DNA was used in the experiment. In vitro cultivation of knockout strains of H. polymorpha was found to exhibit substratespecificity of the ODA. According to the authors, the HP2914 gene is important for D-alanine oxidation, while the gene complex 2400 and 2914 is important for ODA activation in the presence of D-Phe in the medium. It is likely that the gene complex 2082 and 2165 regulates ODA activation when cells are cultured in medium with D-Ala and D-Asp. It was found that in the absence of 2165, 2400, 2914 genes, increased ODA activity to D-Ala only was observed in cell culture medium. The presence of D-alanine combined with 1 % glycerol and 1 % methanol in the culture medium stimulated the activity of the three major ODAs of H. polymorpha through the expression of the HP2914 gene, while the presence of glucose and L-alanine in the culture medium suppressed their activity

This work was financially supported by the Russian Science Foundation (grant RSF no. 19-79-30062)

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