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Nt in dihydrofolate reductase activity. Proc Natl Acad Sci U S A 1980, 77(7):4216?220. 11. Derouazi M, Martinet D, Besuchet Schmutz N, Flaction R, Wicht M, Bertschinger M, Hacker DL, Beckmann JS, Wurm FM: Genetic characterization of CHO production host DG44 and derivative recombinant cell lines. Biochem Biophys Res Commun 2006, 340(4):1069?077. 12. Weiner M, Gackstetter T, Costa G, Bauer C, Kretz K: Site-directed Mutagenesis working with PCR. In Molecular Biology: Existing Innovations and Future Trends. Edited by Griffin A, Griffin H. Wymondham, Norfolk, U.K: Horizon Scientific Press; 1995. 13. Orlova NA, Orlov AV, Vorobiev II: A modular assembly cloning approach (aided by the BIOF software program tool) for seamless and error-free assembly of long DNA fragments. BMC Res Notes 2012, 5:303. 14. Kozak M: An analysis of 5-noncoding sequences from 699 vertebrate messenger RNAs. Nucleic Acids Res 1987, 15(20):8125?148. 15. Patterson GH, Knobel SM, Sharif WD, Kain SR, Piston DW: Use from the green fluorescent protein and its mutants in quantitative fluorescence microscopy. Biophys J 1997, 73(5):2782?790. 16. Ribeiro S, Mairhofer J, Madeira C, Diogo MM, Lobato da Silva C, Monteiro G, Grabherr R, Cabral JM: Plasmid DNA size does affect nonviral gene delivery efficiency in stem cells. Cell Reprogram 2012, 14(2):130?37. 17. Wasley LC, Rehemtulla A, Bristol JA, Kaufman RJ: PACE/furin can approach the vitamin K-dependent pro-factor IX precursor within the secretory pathway. J Biol Chem 1993, 268(12):8458?465.Additional fileAdditional file 1: Primer sequences employed for cloning and sequencing the p 1.1 and p 1.2 expression vectors. Abbreviations CHO cells: Chinese hamster ovary (CHO) cells; MTX: Methotrexate; eGFP: Enhanced green fluorescent protein; EBVTR: Concatemer from the terminal repeats from the Epstein-Barr virus; PCR: Polymerase chain reaction; Kbp: Kilo base pairs (1000 base pairs); EEF1A: Chinese hamster Elongation element 1 alpha; IRES: Internal ribosome entry site; DHFR: dihydrofolate reductase (EC 1.five.1.three); ORF: open reading frame; RFU: relative fluorescence units. Competing interests JAH, AGG and KGS declare that they have no competing interests. NAO, SVK and IIV are inventors of the patent RU2488633, which covers use on the p1.1 vector. Authors’ contributions NAO developed the experimental strategy and plasmid style, performed cloning procedures, and drafted the manuscript. SVK performed the cell culture experiments and helped to draft the manuscript. IIV initiated the project, participated in its style and Vps34 Inhibitor Formulation coordination and drafted the manuscript. NAO, JAH and IIV conducted the copy number determination experiments, SVK, JAH and IIV performed eGFP level determinations. AGG and KGS coordinated the project. All of the authors have read and authorized the final manuscript. Acknowledgments The authors want to thank Dr Sergei Khaidukhov for performing the FACS evaluation and Dr Ivan Vorobiev (senior) for offering the suggestions for FACS information interpretation. We also thank Dr Ivan Zvyagin, Lev Usakin, Maria Kordyukova and Victoria Shender for taking aspect in the molecular cloning procedures. The perform was supported by the following TBK1 Inhibitor list grants: RFBR 13-0440277- “Combinatorial chemistry and biology approaches to theranostics of numerous sclerosis”; RFBR 14-04-00647 ” Combinatorial biology approaches utilizing yeast display for improvement of biocatalysts de novo”; Plan of your Presidium on the Russian Academy of Sciences No24 “Detection of Viral Antigens as you can Trigger.

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