Abstract
Utilizing a variety of fatty acids, differing in chain length, degree and position of unsaturation, we investigated the substrate specificity for the enzymatic production of biologically active slow reacting substances (SRS) and of the other leukotrienes. A cell-free enzyme system obtained from RBL-1 cells was used in this study. The primary structural requirement observed for the conversion by this lipoxygenase enzyme system was a delta 5,8,11 unsaturation in a polyenoic fatty acid. Such fatty acids as 20:4 (5,8,11,14) 20:5 (5,8,11,14,17), 20:3 (5,8,11), 19:4 (5,8,11,14) and 18:4 (5,8,11,14) were readily converted to compounds that comigrated with 5-HETE and 5,12-DiHETE and to biologically active SRS. Chain length did not have an influence on the formatin of these hydroxyacids. Fatty acids with the initial unsaturation at delta 4, delta 6, delta 7, or delta 8 were a poor substrate for the leukotriene enzyme system. Therefore, this lipoxygenase pathway in leukocytes is quite different from the lipoxygenase in platelets which does not exhibit this specificity.
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