ABSTRACT
Background: lipase enzymes have applications in a wide range of industries. A crucial determining factor of industrial prices of these enzymes is the culture media composition that is constantly under review by researchers. In this work, for maximum lipase production by Bacillus sp. ZR-5, culture media compositions were optimized using "one variable at a time" strategy
Methods: for this purpose, the culture medium parameters such as low and high cost carbon and nitrogen sources, substrates and incubation times were evaluated
Results: maximum lipase activity was achieved after 24 hr of incubation with 1.5% of glucose syrup [1600+/-69.1u/mg], 1% of fish powder [1238+/-36.7 u/mg] and olive oil [1407+/-2.1 u/mg] as low cost carbon and nitrogen sources and substrate, respectively
Conclusion: our results show a significant increase in lipase activity with usage of low cost sources; this could help in reducing the media prices for industrial application of lipase enzyme
ABSTRACT
Staphylococcus aureus is a leading cause of many nosocomial and community acquired infections. According to many reports, antibiotic therapy cannot guarantee the eradication of S. aureus infections. Thus designing an adhesin based vaccine could restrain the S. aureus infections. This study designed for construction of a new fusion protein vaccine against S. aureus infections based on adhesin molecules fibronectin binding protein A [FnBPA] and clumping factor A [ClfA]. Bioinformatic experiments were performed using Oligo analyzer and DNAMAN softwares. The fragments corresponding to fnbA binding domain and a C-terminal fragment from clfA were amplified from S. aureus NCTC8325 genomic DNA. Purified PCR products and the vector, pET15b, were digested with NcoI and BamHI. The digested PCR products were hybridized together and then ligated to digested vector. Finally incomplete construct was assembled by Taq DNA polymerase. To quick confirmation of cloning procedure the new construct designated pfnbA-clfA was digested with NcoI and BamHI. To further verification, the product was sent for sequencing. The data based on bioinformatics analysis showed no homology between fusion protein and human proteins. Digestion of new vector with NcoI and BamHI confirmed the ligation of fusion protein sequence into pET15b. Sequencing results verified the integrity of target sequences. This study is the first effort to construct a new fusion protein vector based on S. aureus adhesins using a new design. This project is being continued to study the expression and biological activity of the fusion protein in a cell culture model