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软脂酸的合成过程（从甲基向羧基端 延长）

每经过一次循环——延长两个C

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1.启动：乙酰-CoA合酶：ACP转酰酶

2.装载：丙二酸单酰-CoA：ACP转酰酶

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3.缩合： β -酮酰-ACP合成酶

4.还原： β -酮酰-ACP还原酶

5.脱水： β-羟酰-ACP脱水酶

6.还原：烯酰-ACP还原酶

7.释放：软脂酰-ACP硫脂酶

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总反应：

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经历7轮 缩合-还原-脱水-还原