Newly Identified Essential Amino Acids Affecting Chlorella ellipsoidea DGAT1 Function Revealed by Site-Directed Mutagenesis.
Newly Identified Essential Amino Acids Affecting Chlorella ellipsoidea DGAT1 Function Revealed by Site-Directed Mutagenesis.
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通过定点诱变揭示新鉴定的影响椭圆小球藻 DGAT1 功能的必需氨基酸
DOI:
10.3390/ijms19113462
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发表时间:
2018-11-04
影响因子:
5.6
通讯作者:
Hu Z
中科院分区:
文献类型:
--
作者:
Sun B;Guo X;Fan C;Chen Y;Wang J;Hu Z
Diacylglycerol acyltransferase (DGAT) is a rate-limiting enzyme in the synthesis of triacylglycerol (TAG), the most important form of energy storage in plants. Some residues have previously been proven to be crucial for DGAT1 activity. In this study, we used site-directed mutagenesis of the CeDGAT1 gene from Chlorella ellipsoidea to alter 16 amino acids to investigate effects on DGAT1 function. Of the 16 residues (L482R, E542R, Y553A, G577R, R579D, Y582R, R596D, H603D, H609D, A624R, F629R, S632A, W650R, A651R, Q658H, and P660R), we newly identified 5 (L482, R579, H603, A651, and P660) as being essential for DGAT1 function and 7 (E542, G577, R596, H609, A624, S632, and Q658) that significantly affect DGAT1 function to different degrees, as revealed by heterologous expression of the mutants in yeast strain INVSc1. Importantly, compared with CeDGAT1, expression of the mutant CeDGAT1Y553A significantly increased the total fatty acid and TAG contents of INVSc1. Comparison among CeDGAT1Y553A, GmDGAT1Y341A, AtDGAT1Y364A, BnDGAT1Y347A, and BoDGAT1Y352A, in which tyrosine at the position corresponding to the 553rd residue in CeDGAT1 is changed into alanine, indicated that the impact of changing Y to A at position 553 is specific for CeDGAT1. Overall, the results provide novel insight into the structure and function of DGAT1, as well as a mutant gene with high potential for lipid improvement in microalgae and plants.
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影响因子:
7.4
作者:
Li, Fengling;Wu, Xuemin;Kunst, Ljerka
通讯作者:
Kunst, Ljerka
DOI:
10.1016/j.algal.2015.10.017
发表时间:
2016-01-01
影响因子:
5.1
作者:
Kirchner, Linda;Wirshing, Alison;Lee-Parsons, Carolyn W. T.
通讯作者:
Lee-Parsons, Carolyn W. T.
DOI:
10.1046/j.1432-1327.2000.00961.x
发表时间:
2000-01-01
期刊:
EUROPEAN JOURNAL OF BIOCHEMISTRY
影响因子:
--
作者:
Bouvier-Navé, P;Benveniste, P;Schaller, H
通讯作者:
Schaller, H
影响因子:
7.4
作者:
Jako, C;Kumar, A;Taylor, DC
通讯作者:
Taylor, DC
影响因子:
4.8
作者:
Milcamps, A;Tumaney, AW;Pollard, M
通讯作者:
Pollard, M