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Published on May 2, 2002; 10.1104/pp.002725

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Received January 12, 2002
Returned for revision February 8, 2002
Accepted February 19, 2002

The pgp1 Mutant Locus of Arabidopsis Encodes a Phosphatidylglycerolphosphate Synthase with Impaired Activity

Changcheng Xu , Heiko Härtel , Hajime Wada , Miki Hagio , Bin Yu , Chris Eakin , and Christoph Benning *

Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan 48824--1319 (C.X., H.H., B.Y., C.E., C.B.); and Department of Biology, Faculty of Sciences, Kyushu University, Ropponmatsu, Fukuoka 810--8560, Japan (H.W., M.H.)

* Corresponding author; email: benning{at}msu.edu.

Phosphatidylglycerol is a ubiquitous phospholipid that is also present in the photosynthetic membranes of plants. Multiple independent lines of evidence suggest that this lipid plays a critical role for the proper function of photosynthetic membranes and cold acclimation. In eukaryotes, different subcellular compartments are competent for the biosynthesis of phosphatidylglycerol. Details on the plant-specific pathways in different organelles are scarce. Here, we describe a phosphatidylglycerol biosynthesis-deficient mutant of Arabidopsis, pgp1. The overall content of phosphatidylglycerol is reduced by 30%. This mutant carries a point mutation in the CDP-alcohol phosphotransferase motif of the phosphatidylglycerolphosphate synthase (EC 2.7.8.5) isoform encoded by a gene on chromosome 2. The mutant shows an 80% reduction in plastidic phosphatidylglycerolphosphate synthase activity consistent with the plastidic location of this particular isoform. Mutant plants are pale green, and their photosynthesis is impaired. This mutant provides a promising new tool to elucidate the biosynthesis and function of plastidic phosphatidylglycerol in seed plants.






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