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Plant acyl-CoA:lysophosphatidylcholine acyltransferases (LPCATs) have different specificities in their forward and reverse reactions Open Access

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Author or creator
Lager, Ida
Yilmaz, Jenny L.
Zhou, Xue-Rong
Jasieniecka, Katarzyna
Kazachkov, Michael
Wang, Peng
Zou, Jitao
Weselake, Randall
Smith, Mark A.
Bayon, Shen
Dyer, John M.
Shockey, Jay M.
Heinz, Ernst
Green, Allan
Banas, Antoni
Stymne, Sten
Additional contributors
Subject/Keyword
Plant Lipid Biochemistry
Plant Biochemistry
Enzyme
Lysophosphatidylcholine Acyltransferases
Lipid Metabolism
Enzymes
Phosphatidylcholine Metabolism
Phosphatidylcholine
Arabidopsis
Type of item
Journal Article (Published)
Language
English
Place
Time
Description
Acyl-CoA:lysophosphatidylcholine acyltransferase (LPCAT) enzymes have central roles in acyl editing of phosphatidylcholine (PC). Plant LPCAT genes were expressed in yeast and characterized biochemically in microsomal preparations of the cells. Specificities for different acyl-CoAs were similar for seven LPCATs from five different species, including species accumulating hydroxylated acyl groups in their seed oil, with a preference for C18-unsaturated acyl-CoA and low activity with palmitoyl-CoA and ricinoleoyl (12-hydroxyoctadec-9-enoyl)-CoA. We showed that Arabidopsis LPCAT1 and LPCAT2 enzymes catalyzed the acylation and de-acylation of both sn positions of PC, with a preference for the sn-2 position. When acyl specificities of the Arabidopsis LPCATs were measured in the reverse reaction, sn-2-bound oleoyl, linoleoyl, and linolenoyl groups from PC were transferred to acyl-CoA to a similar extent. However, a ricinoleoyl group at the sn-2-position of PC was removed 4–6-fold faster than an oleoyl group in the reverse reaction, despite poor utilization in the forward reaction. The data presented, taken together with earlier published reports on in vivo lipid metabolism, support the hypothesis that plant LPCAT enzymes play an important role in regulating the acyl-CoA composition in plant cells by transferring polyunsaturated and hydroxy fatty acids produced on PC directly to the acyl-CoA pool for further metabolism or catabolism.
Date created
2013
DOI
doi:10.7939/R34J0BB1Q
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Attribution 3.0 Unported
Citation for previous publication
Lager, I., Yilmaz, J. L., Zhou, X. -R., Jasieniecka, K., Kazachkov, M., Wang, P., Zou, J., Weselake, R., Smith, M. A., Bayon, S., Dyer, J. M., Shockey, J. M., Heinz, E., Green, A., Banas, A., & Stymne, S. (2013). Plant acyl-CoA:lysophosphatidylcholine acyltransferases (LPCATs) have different specificities in their forward and reverse reactions. Journal of Biological Chemistry, 288(52), 36902-36914.  http://dx.doi.org/10.1074/jbc.M113.521815

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