Production of hyaluronic acid by mutant strains of group C Streptococcus
| Autor: | Zbyněk Černý, Jana Jílková, Lukáš Franke, Stanislav Pepeliaev, Ján Krahulec, Marcela Tlustá |
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| Rok vydání: | 2012 |
| Předmět: |
Reporter gene
Operon Point mutation Mutant Wild type Bioengineering Promoter Biology Applied Microbiology and Biotechnology Biochemistry Molecular biology Microbiology Genes Bacterial Mutation Mutagenesis Site-Directed gal operon Streptococcus equi Biomass Hyaluronic Acid Promoter Regions Genetic Molecular Biology Gene Biotechnology Plasmids |
| Zdroj: | Molecular biotechnology. 54(3) |
| ISSN: | 1559-0305 |
| Popis: | This study addresses the influence of upstream region sequence on the strength of has operon promoter in highly encapsulated S. equi subsp. zooepidemicus (SEZ). For this purpose, seven different strains were constructed. Each strain carries a point mutation in one of the following positions upstream of the has promoter: −43, −44, −49, and −50 bp. To facilitate measuring of the recombinant promoter relative strength, s-glucuronidase gene was used as a reporter gene. Three mutations located in positions −49 and −50: AT, GT, and AG, positively impacted has promoter strength when compared to the wild type sequence GG. Conversely, two other mutations: TG and TT, exhibited a slight inhibitory effect. Further, three different strains carrying chromosomal mutations in the has promoter region were constructed. In two cases, the has operon is under the control of a stronger promoter and in the third strain the has operon is controlled by a weaker promoter. The laboratory fermenter scale cultivations confirmed the increase of hyaluronan yields for SEZPhasAG and SEZPhas2G, resulting 116 and 105 %, respectively. As expected, the yield of the hyaluronic acid of SEZPhas2B strain fell to 41 %. |
| Databáze: | OpenAIRE |
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