Structural basis for altered positional specificity of 15-lipoxygenase-1 with 5S-HETE and 7S-HDHA and the implications for the biosynthesis of resolvin E4
作者:Steven C. Perry、Christopher van Hoorebeke、James Sorrentino、Leslie Bautista、Oluwayomi Akinkugbe、William S. Conrad、Natalie Rutz、Theodore R. Holman
DOI:10.1016/j.abb.2022.109317
日期:2022.9
the exact role each of the two 15-LOXs in these biosynthetic pathways remains elusive. Previously, it was observed that h15-LOX-1 reacted with 5S-HETE in a non-canonical manner, producing primarily the 5S,12S-diHETE product. To determine the active site constraints of h15-LOX-1 in achieving this reactivity, amino acids involved in the fatty acid binding were investigated. It was observed that R402L
人类 15-脂氧合酶 (LOX) 是炎症过程中的关键酶,可产生各种促分解分子,例如脂氧素和分解素,但这两种 15-LOX 在这些生物合成途径中的确切作用仍不清楚。以前,观察到 h15-LOX-1 以非规范方式与 5S-HETE 反应,主要产生 5S,12S-diHETE 产物。为了确定 h15-LOX-1 在实现这种反应性方面的活性位点限制,研究了参与脂肪酸结合的氨基酸。据观察,R402L 对 5S-HETE 催化作用没有太大影响,但 F414 似乎与 5S-HETE 形成 π-π 堆叠,如 AA 所示结合,表明 5S-HETE 和 F414 的双键之间存在芳香族相互作用。减小 F352 和 I417 的大小将 5S-HETE 的氧化转移到 C12,而增加这些残基的大小则逆转了 5S-HETE 到 C15 的位置特异性。这些位置的突变体以 7S-HDHA 作为底物表现出类似的效果,表明活性