Abstract
A highly purified Ca2+-stimulated lipoxygenase was isolated from the Hill variety of soybean seeds. Separation of Ca2+-stimulated lipoxygenase from lipoxygenase active in the absence of Ca2+ (lipoxygenase-1) was readily obtained using a DEAE-cellulose column. Sample size applied to the ion exchange column was found to be critical. Both enzymes were bound to the column, although some highly active Ca2+-stimulated lipoxygenase eluted with buffer in the presence of bound lipoxygenase-1. Ca2+-stimulated lipoxygenase bound to DAAE-cellulose required the use of a NaCl gradient for elution. Ca2+-stimulated lipoxygenase showed an apparent isoelectric point at pH 5.90 and optimum activity at pH 7.5 and at 1.1 mM calcium. Lipoxygenase-1 was inhibited over 95% in the presence of 60 μM methyl mercuric chloride, while Ca2+-stimulated lipoxygenase showed a maximum of only 20% inhibition under the same conditions.
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Paper No. 4993 Mississippi Agricultural and Forestry Experiment Station.
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Dreesen, T.D., Dickens, M. & Koch, R.B. Partial purification and characterization of a Ca2+-stimulated lipoxygenase from soybean seeds. Lipids 17, 964–969 (1982). https://doi.org/10.1007/BF02534593
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DOI: https://doi.org/10.1007/BF02534593