Two distinct domains contribute to the substrate acyl chain length selectivity of plant acyl-ACP thioesterase.
Two distinct domains contribute to the substrate acyl chain length selectivity of plant acyl-ACP thioesterase.
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DOI:
10.1038/s41467-018-03310-z
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发表时间:
2018-02-28
影响因子:
16.6
通讯作者:
Nikolau BJ
中科院分区:
文献类型:
--
作者:
Jing F;Zhao L;Yandeau-Nelson MD;Nikolau BJ
The substrate specificity of acyl-ACP thioesterase (TE) plays an essential role in controlling the fatty acid profile produced by type II fatty acid synthases. Here we identify two groups of residues that synergistically determine different substrate specificities of two acyl-ACP TEs from Cuphea viscosissima (CvFatB1 and CvFatB2). One group (V194, V217, N223, R226, R227, and I268 in CvFatB2) is critical in determining the structure and depth of a hydrophobic cavity in the N-terminal hotdog domain that binds the substrate’s acyl moiety. The other group (255-RKLSKI-260 and 285-RKLPKL-289 in CvFatB2) defines positively charged surface patches that may facilitate binding of the ACP moiety. Mutagenesis of residues within these two groups results in distinct synthetic acyl-ACP TEs that efficiently hydrolyze substrates with even shorter chains (C4- to C8-ACPs). These insights into structural determinants of acyl-ACP TE substrate specificity are useful in modifying this enzyme for tailored fatty acid production in engineered organisms. The substrate specificity of acyl-ACP thioesterase (TE) plays a crucial role in determining the product profile of type II fatty acid synthase. Utilizing two FatB-type acyl-ACP TEs, the authors here define determinants of substrate specificity and create synthetic enzymes with distinct catalytic traits.
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