Structural analysis of protein inclusion bodies by Fourier transform infrared microspectroscopy |
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Authors: | Ami Diletta Natalello Antonino Taylor Geoffrey Tonon Giancarlo Maria Doglia Silvia |
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Institution: | Dipartimento di Biotecnologie e Bioscienze, Università di Milano Bicocca, Piazza della, Scienza 2, 20126 Milan, Italy. |
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Abstract: | The expression of recombinant human growth hormone (h-GH) and human interferon-alpha-2b (IFN-alpha-2b) in E. coli leads to the formation of insoluble protein aggregates or inclusion bodies (IBs). The secondary structure of these IBs, their corresponding native forms and thermal aggregates were studied by Fourier Transform Infrared (FT-IR) spectroscopy and microspectroscopy. It was demonstrated that residual native-like structures were maintained within IBs at different extents depending on the level of expression, with possible implications in biotechnology. Furthermore, comparison between infrared spectra of thermal aggregates and IBs suggests new insights on the structure of protein aggregates. |
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