The effect of non-thermal atmospheric plasma on the production and activity of recombinant phytase enzyme

• Published in: Scientific reports 2018-11, Vol.8 (1), p.16647-12, Article 16647
• Main Authors: Farasat, Mahsa, Arjmand, Sareh, Ranaei Siadat, Seyed Omid, Sefidbakht, Yahya, Ghomi, Hamid
• Format: Article
• Language: English
• Subjects: 119/118; 13/44; 6-Phytase - genetics; 6-Phytase - metabolism; 631/57; 639/624; 82/16; 82/29; 82/80; Amino acids; Aspergillus niger - enzymology; Atmospheric Pressure; Biological effects; Circular dichroism; Enzymatic activity; Enzymes; Gene Expression Regulation, Enzymologic - drug effects; Humanities and Social Sciences; Hydrogen peroxide; Hydrogen-Ion Concentration; Macromolecules; multidisciplinary; Pichia - drug effects; Pichia - genetics; Pichia - growth & development; Pichia - metabolism; Plasma Gases - pharmacology; Protein structure; Reactive oxygen species; Recombinant Proteins - genetics; Recombinant Proteins - metabolism; Science; Science (multidisciplinary); Secondary structure; Spices; Structure-function relationships; Tertiary structure; Yeasts
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/s41598-018-34239-4

Atmospheric pressure cold plasma (ACP) is introduced as a useful tool in a variety of biological applications. Proteins are the most abundant macromolecules in living systems with a central role in all biological processes. These organic molecules are modified by ACP exposure that is responsible for many of ACP’s biological effects. This study evaluated the effect of ACP on the production of recombinant phytase in yeast Pichia pastoris ( P. pastoris ) as well as the structure and function of the phytase enzyme. The results indicated that yeast cells treated with ACP, directly or indirectly, produced higher amounts of recombinant phytase, which was associated with the time of ACP treatment. The exposure of commercial phytase solution with ACP caused a significant increase in the enzyme activity (125%) after 4 hours. Evaluation of the phytase solution by far- and near-UV circular dichroism (CD) and fluorescence analysis indicated that this protein maintained its secondary structure when exposed to ACP while the tertiary structure was slightly unfolded. The effects of heat and H 2 O 2 on the phytase structure and function were compared with the effect of ACP treatment. The modification of Cys, Tyr and Trp amino acids upon reactive oxygen/nitrogen spices was simulated using a molecular dynamics approach. RMSF and RMSD analysis suggested that this structural alteration occurs owing to changes made by reactive species in accessible amino acids.