Publication date: June 2017
Source:International Journal of Biological Macromolecules, Volume 99
Author(s): Hossein Safarpour, Sahar Barzegari Banadkoki, Zahra Keshavarzi, Mohammad Hossein Morowvat, Mahdieh Soleimanpour, Shokoufeh Pourmolaei, Farshad H. Shirazi
TNF-α, a prototype member of the TNF family of ligands, has both pro-inflammatory and immune-regulatory functions, which make it as an appropriate therapeutic target for selective blockade in antibody therapy of many diseases like in rheumatoid arthritis. Using two models of SHuffle® T7 Express and BL21 (DE3) cells, we have expressed this protein and recognized it by SDS-PAGE analysis. FTIR biospectroscopy of the resulted purified proteins has been performed and mathematical calculations has been done for further identification of the structural and conformational differences between the two products. Our results showed some differences in disulfide bond formation and β-sheet turns between these two recombinant proteins. To the best of our knowledge, this is the first study that compare secondary structure of recombinant proteins in both conventional and next generation Escherichia coli based expression systems using reliable, simple, rapid and economic ATR-FTIR analysis. Whether these differences might have significant effects on TNF-α inflammatory and immune-regulatory function in biological systems might be very much important and need further investigations.
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