Tan, X. L., Huang, Q., Tan, R. K., Wu, L., Zhang, Zh. Y., Wang, Zh., Lu, Ch. M., Li, X. F. (2015). Cloning and Functional Characterization of a Fatty Acyl-Acyl Carrier Protein Thioesterase Gene (BnFatB) in Brassica napus L.. , 17(4), 987-997.
X. L. Tan; Q. Huang; R. K. Tan; L. Wu; Zh. Y. Zhang; Zh. Wang; Ch. M. Lu; X. F. Li. "Cloning and Functional Characterization of a Fatty Acyl-Acyl Carrier Protein Thioesterase Gene (BnFatB) in Brassica napus L.". , 17, 4, 2015, 987-997.
Tan, X. L., Huang, Q., Tan, R. K., Wu, L., Zhang, Zh. Y., Wang, Zh., Lu, Ch. M., Li, X. F. (2015). 'Cloning and Functional Characterization of a Fatty Acyl-Acyl Carrier Protein Thioesterase Gene (BnFatB) in Brassica napus L.', , 17(4), pp. 987-997.
Tan, X. L., Huang, Q., Tan, R. K., Wu, L., Zhang, Zh. Y., Wang, Zh., Lu, Ch. M., Li, X. F. Cloning and Functional Characterization of a Fatty Acyl-Acyl Carrier Protein Thioesterase Gene (BnFatB) in Brassica napus L.. , 2015; 17(4): 987-997.

Cloning and Functional Characterization of a Fatty Acyl-Acyl Carrier Protein Thioesterase Gene (BnFatB) in Brassica napus L.

Journal of Agricultural Science and Technology
Article 17, Volume 17, Issue 4, 2015, Pages 987-997    PDF (6.33 M)
Authors
X. L. Tan* 1; Q. Huang2; R. K. Tan1; L. Wu3; Zh. Y. Zhang1; Zh. Wang1; Ch. M. Lu3; X. F. Li1
1Institute of Life Sciences, Jiangsu University, Zhenjiang, 212013, People Republic of China.
2Institute of Life Sciences, Jiangsu University
3Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences, Wuhan, 430062, People Republic of China.
Abstract
Plant fatty acyl-acyl carrier protein thioesterase (FAT) is a major enzyme regulating the amount and composition of fatty acids in lipids. In this study, one type of cDNA, corresponding to the fatty acyl-acyl carrier protein (acyl-ACP) thioesterase (Fat) enzyme, was isolated from the seed of Brassica napus cv. Ningyou12. BLAST results revealed that the cDNA identified highly with the FatB class of plant thioesterases. The cDNA contained a 1,245 bp open reading frame (ORF), encoding a protein that contained 414 amino acid residues. Subcellular localization results showed that the BnFatB protein was located in the chloroplast. The BnFatB (KC445243) gene was expressed in many tissues and was strongly expressed in seeds. Heterologous expression of the BnFatB gene in yeast cells was performed in order to ascertain the function of the BnFatB gene. Semi-quantitative RT-PCR results indicated that the expression level of the BnFatB gene in transformed yeast had significantly increased compared to the control. GC analysis of the fatty acid revealed that, when compared with the control, the content of C16:0 and C18:0 in yeast cells expressing BnFatB increased by 45.7 and 21.7%, respectively; while C16:1 and C18:1 decreased by 15.3 and 30.6%, respectively. This study demonstrated that the BnFatB gene had similar function as the FatB enzyme, preferentially releasing saturated fatty acid from the acyl carrier protein. It can therefore be used as a candidate target for fatty acid improvement in oilseed rape.
Keywords
Fatty acid; GC analysis; Heterologous expression; Lipid; Yeast
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