Phospholipid:diacylglycerol acyltransferase: An enzyme that catalyzes the acyl-CoA-independent formation of triacylglycerol in yeast and plants

• Anders Dahlqvist

  Scandinavian Biotechnology Research (ScanBi) AB, Herman Ehles Väg 2 S-26831 Svalôv, Sweden; Department of Plant Breeding Research, Swedish University of Agricultural Sciences, Herman Ehles väg 2–4, S-268 31 Svalöv, Sweden; and Department of Plant Biology, Uppsala Genetic Center, Swedish University of Agricultural Sciences, Box 7080, S-750 07 Uppsala, Sweden

• Ulf Ståhl

  Scandinavian Biotechnology Research (ScanBi) AB, Herman Ehles Väg 2 S-26831 Svalôv, Sweden; Department of Plant Breeding Research, Swedish University of Agricultural Sciences, Herman Ehles väg 2–4, S-268 31 Svalöv, Sweden; and Department of Plant Biology, Uppsala Genetic Center, Swedish University of Agricultural Sciences, Box 7080, S-750 07 Uppsala, Sweden

• Marit Lenman

  Scandinavian Biotechnology Research (ScanBi) AB, Herman Ehles Väg 2 S-26831 Svalôv, Sweden; Department of Plant Breeding Research, Swedish University of Agricultural Sciences, Herman Ehles väg 2–4, S-268 31 Svalöv, Sweden; and Department of Plant Biology, Uppsala Genetic Center, Swedish University of Agricultural Sciences, Box 7080, S-750 07 Uppsala, Sweden

• Antoni Banas

  Scandinavian Biotechnology Research (ScanBi) AB, Herman Ehles Väg 2 S-26831 Svalôv, Sweden; Department of Plant Breeding Research, Swedish University of Agricultural Sciences, Herman Ehles väg 2–4, S-268 31 Svalöv, Sweden; and Department of Plant Biology, Uppsala Genetic Center, Swedish University of Agricultural Sciences, Box 7080, S-750 07 Uppsala, Sweden

• Michael Lee

  Scandinavian Biotechnology Research (ScanBi) AB, Herman Ehles Väg 2 S-26831 Svalôv, Sweden; Department of Plant Breeding Research, Swedish University of Agricultural Sciences, Herman Ehles väg 2–4, S-268 31 Svalöv, Sweden; and Department of Plant Biology, Uppsala Genetic Center, Swedish University of Agricultural Sciences, Box 7080, S-750 07 Uppsala, Sweden

• Line Sandager

  Scandinavian Biotechnology Research (ScanBi) AB, Herman Ehles Väg 2 S-26831 Svalôv, Sweden; Department of Plant Breeding Research, Swedish University of Agricultural Sciences, Herman Ehles väg 2–4, S-268 31 Svalöv, Sweden; and Department of Plant Biology, Uppsala Genetic Center, Swedish University of Agricultural Sciences, Box 7080, S-750 07 Uppsala, Sweden

• Hans Ronne

  Scandinavian Biotechnology Research (ScanBi) AB, Herman Ehles Väg 2 S-26831 Svalôv, Sweden; Department of Plant Breeding Research, Swedish University of Agricultural Sciences, Herman Ehles väg 2–4, S-268 31 Svalöv, Sweden; and Department of Plant Biology, Uppsala Genetic Center, Swedish University of Agricultural Sciences, Box 7080, S-750 07 Uppsala, Sweden

• Sten Stymne

  Scandinavian Biotechnology Research (ScanBi) AB, Herman Ehles Väg 2 S-26831 Svalôv, Sweden; Department of Plant Breeding Research, Swedish University of Agricultural Sciences, Herman Ehles väg 2–4, S-268 31 Svalöv, Sweden; and Department of Plant Biology, Uppsala Genetic Center, Swedish University of Agricultural Sciences, Box 7080, S-750 07 Uppsala, Sweden

抄録

Triacylglycerol (TAG) is known to be synthesized in a reaction that uses acyl-CoA as acyl donor and diacylglycerol (DAG) as acceptor, and which is catalyzed by the enzyme acyl-CoA:diacylglycerol acyltransferase. We have found that some plants and yeast also have an acyl-CoA-independent mechanism for TAG synthesis, which uses phospholipids as acyl donors and DAG as acceptor. This reaction is catalyzed by an enzyme that we call phospholipid:diacylglycerol acyltransferase, or PDAT. PDAT was characterized in microsomal preparations from three different oil seeds: sunflower, castor bean, and Crepis palaestina . We found that the specificity of the enzyme for the acyl group in the phospholipid varies between these species. Thus, C. palaestina PDAT preferentially incorporates vernoloyl groups into TAG, whereas PDAT from castor bean incorporates both ricinoleoyl and vernoloyl groups. We further found that PDAT activity also is present in yeast microsomes. The substrate specificity of this PDAT depends on the head group of the acyl donor, the acyl group transferred, and the acyl chains of the acceptor DAG. The gene encoding the enzyme was identified. The encoded PDAT protein is related to lecithin:cholesterol acyltransferase, which catalyzes the acyl-CoA-independent synthesis of cholesterol esters. However, budding yeast PDAT and its relatives in fission yeast and Arabidopsis form a distinct branch within this protein superfamily, indicating that a separate PDAT enzyme arose at an early point in evolution.

収録刊行物

• Proceedings of the National Academy of Sciences

  Proceedings of the National Academy of Sciences 97 (12), 6487-6492, 2000-05-30

  Proceedings of the National Academy of Sciences

キーワード

• Multidisciplinary

詳細情報

• CRID: 1364233269266432000
• NII論文ID: 80011887805
• DOI: 10.1073/pnas.120067297
• ISSN: 10916490
• ISSN: 00278424
• Web Site: https://pnas.org/doi/pdf/10.1073/pnas.120067297
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