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• W2108400567 abstract "The first step in assembly of membrane and storage glycerolipids is acylation of glycerol-3-phosphate (G3P). All previously characterized membrane-bound, eukaryotic G3P acyltransferases (GPATs) acylate the sn -1 position to produce lysophosphatidic acid (1-acyl-LPA). Cutin is a glycerolipid with omega-oxidized fatty acids and glycerol as integral components. It occurs as an extracellular polyester on the aerial surface of all plants, provides a barrier to pathogens and resistance to stress, and maintains organ identity. We have determined that Arabidopsis acyltransferases GPAT4 and GPAT6 required for cutin biosynthesis esterify acyl groups predominantly to the sn -2 position of G3P. In addition, these acyltransferases possess a phosphatase domain that results in sn -2 monoacylglycerol (2-MAG) rather than LPA as the major product. Such bifunctional activity has not been previously described in any organism. The possible roles of 2-MAGs as intermediates in cutin synthesis are discussed. GPAT5, which is essential for the accumulation of suberin aliphatics, also exhibits a strong preference for sn -2 acylation. However, phosphatase activity is absent and 2-acyl-LPA is the major product. Clearly, plant GPATs can catalyze more reactions than the sn -1 acylation by which they are currently categorized. Close homologs of GPAT4-6 are present in all land plants, but not in animals, fungi or microorganisms (including algae). Thus, these distinctive acyltransferases may have been important for evolution of extracellular glycerolipid polymers and adaptation of plants to a terrestrial environment. These results provide insight into the biosynthetic assembly of cutin and suberin, the two most abundant glycerolipid polymers in nature." @default.
• W2108400567 created "2016-06-24" @default.
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• W2108400567 date "2010-06-15" @default.
• W2108400567 modified "2023-10-16" @default.
• W2108400567 title "A distinct type of glycerol-3-phosphate acyltransferase with <i>sn</i> -2 preference and phosphatase activity producing 2-monoacylglycerol" @default.
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• W2108400567 doi "https://doi.org/10.1073/pnas.0914149107" @default.
• W2108400567 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2900678" @default.
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