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Overexpression of Thermal and pH Stable Alginate Lyase of P. aeruginosa 293 and In silico Study of algL Gene | ||
| Journal of Genetic Resources | ||
| دوره 7، شماره 1، 2021، صفحه 49-58 اصل مقاله (292 K) | ||
| نوع مقاله: Research Article | ||
| شناسه دیجیتال (DOI): 10.22080/jgr.2021.19826.1208 | ||
| نویسندگان | ||
| Maryam Zali Benekohal1؛ Parinaz Ghadam* 1؛ Sara Gharavi1؛ Ahya Abdi Ali2؛ Firoozeh Piroozmand3 | ||
| 1Department of Biotechnology, Faculty of Biological Sciences, Alzahra University, Tehran, Iran | ||
| 2Department of Microbiology, Faculty of Biological Sciences, Alzahra University, Tehran, Iran | ||
| 3Department of Microbiology, Faculty of Biological Sciences, University of Tehran, Tehran, Iran | ||
| تاریخ دریافت: 08 شهریور 1399، تاریخ بازنگری: 11 آذر 1399، تاریخ پذیرش: 08 آبان 1399 | ||
| چکیده | ||
| P. aeruginosa is an opportunistic bacterium that produces a capsule-like polysaccharide called alginate in response to various stimuli. The mucoid strain of Pseudomonas aeruginosa produces alginate which is an exopolysaccharide and is involved in the pathogenicity and persistence of these bacteria in infections. The alginate lyase gene is required for alginate synthesis. The enzyme can also degrade this polymer. This enzyme has a polymorphism in different bacteria even in one species and finding an enzyme with tremendous characters is very important. In this study, alginate lyase from P. aeruginosa strain 293 which was previously isolated from the sputum, and the encoding gene was characterized, and thermal and pH stability, as well as the substrate specificity of the partially purified alginate lyase, were determined. The amount of 70% activity of the enzyme was maintained after incubation at 80 ˚C for 6 hrs and 50% activity retained after incubation in alkaline and acidic pH. Moreover, it showed activity towards guluronic acid blocks, mannuronic acid blocks, and alginate blocks with both of them. Due to the unique properties of the alginate lyase that are useful in medicinal, and industrial applications, the gene encoding the enzyme was expressed in pET-28a (+)/E. coli BL21 (DE3) system to produce 371 -amino acid alginate lyase protein, the molecular weight of which was estimated by Sodium Dodecyl Sulfate- Polyacrylamide gel electrophoresis to be about 40 kDa. Bioinformatic analysis of P. aeruginosa strain 293 algL gene revealed that G225A point mutation can improve its thermostability. Therefore, the P. aeruginosa 293 alginate lyase is proposed as an appropriate candidate for the evaluation of potential therapeutic and industrial applications. | ||
| کلیدواژه‌ها | ||
| Alginase؛ algL؛ computational study؛ pH stability؛ thermostability | ||
| مراجع | ||
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