Enhancement of E. coli acyl-CoA synthetase FadD activity on medium chain fatty acids.

Enhancement of E. coli acyl-CoA synthetase FadD activity on medium chain fatty acids.
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DOI:
10.7717/peerj.1040
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发表时间:
2015
期刊:
影响因子:
2.7
通讯作者:
Way JC
Way JC
中科院分区:
生物学3区
文献类型:
--
作者:
Ford TJ;Way JC

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FadD催化E.大肠杆菌β-氧化,将游离脂肪酸活化成酰基-CoA硫酯。这种活化使脂肪酸能够催化还原成醇和烷烃等衍生物。由中链脂肪酸(MCFA,6-12个碳)衍生的醇和烷烃是潜在的生物燃料;然而,FadD对MCFA具有低活性。在此,我们在fadD中产生突变,其增强其对MCFA的酰基辅酶A合成酶活性。同源性建模显示,这些突变聚集在FadD的一个面上,预计副产物AMP将从该面上退出。使用FadD同源性模型,我们设计了额外的FadD突变,增强E。大肠杆菌在辛酸盐上的生长速率,并为模型提供证据,其中辛酸盐上的FadD活性可以通过帮助产物排出来增强。这些研究提供了用于产生MCFA衍生物的FadD突变体和改变腺苷酸化酶的底物特异性的基本原理。
FadD catalyses the first step in E. coli beta-oxidation, the activation of free fatty acids into acyl-CoA thioesters. This activation makes fatty acids competent for catabolism and reduction into derivatives like alcohols and alkanes. Alcohols and alkanes derived from medium chain fatty acids (MCFAs, 6–12 carbons) are potential biofuels; however, FadD has low activity on MCFAs. Herein, we generate mutations in fadD that enhance its acyl-CoA synthetase activity on MCFAs. Homology modeling reveals that these mutations cluster on a face of FadD from which the co-product, AMP, is expected to exit. Using FadD homology models, we design additional FadD mutations that enhance E. coli growth rate on octanoate and provide evidence for a model wherein FadD activity on octanoate can be enhanced by aiding product exit. These studies provide FadD mutants useful for producing MCFA derivatives and a rationale to alter the substrate specificity of adenylating enzymes.
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