Fourier Transform Infrared Study of Lipoxygenase Conformation in Organic Solvent Media

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Abstract:

The secondary structure of commercially purified soybean lipoxygenase (EC 1.13.11.12) was investigated in selected monophasic organic solvents, including chloroform, methanol, acetonitrile, hexane, and octane. The Fourier transform infrared (FT-IR) spectra of the enzyme obtained in chloroform, methanol, and acetonitrile showed an absorption band at 1617 cm−1 indicative of significant protein aggregation, whereas spectra of lipoxygenase in hexane and octane exhibited substantially less aggregate formation. Variable-temperature infrared studies of lipoxygenase in D2O show that the predominately α-helical structure of the protein undergoes an irreversible transition to intermolecular β-sheet at and above 65 °C. Chemical imaging technology employing an FT-IR spectrometer equipped with an infrared microscope and a focal-plane array detector was used to examine the changes in the secondary structure of lipoxygenase at the water–hexane interface in the presence and absence of substrate. The secondary structure of lipoxygenase at the hexane–water interface was comparable to that of the structure of lipoxygenase in D2O after exposure of lipoxygenase solution to hexane.

Keywords: BIOCATALYSIS; FOURIER TRANSFORM INFRARED SPECTROSCOPY; FT-IR SPECTROSCOPY; LIPOXYGENASE; MEDIA; ORGANIC SOLVENT; SECONDARY STRUCTURE

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370206776023296

Affiliations: Department of Food Science and Agricultural Chemistry, McGill University, 21,111 Lakeshore, Ste-Anne de Bellevue, Quebec, Canada H9X 3V9

Publication date: February 1, 2006

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