Friday, September 19, 2008, 11:00 am — John Dunn Seminar Room, Bldg. 463
The biogenesis of the photosynthetic membranes in chloroplasts requires extensive lipid transfer between the endoplasmic reticulum and the chloroplast. However, on a molecular basis we know very little, either of the genes involved in the process, or the mechanism of action of the gene products. We have identified and characterized four genetic loci related to this aspect of lipid transport. Among them are genes encoding the permease, the substrate-binding protein, and the ATPase subunits of a putative ABC transporter complex in the inner chloroplast envelope membrane. The fourth locus encodes an ER membrane protein involved in lipid transport between ER and outer chloroplast envelope membrane. [References: Xu CC, Fan J, Cornish AJ, Benning C. Lipid trafficking between the endoplasmic reticulum and the plastid in Arabidopsis requires the extraplastidic TGD4 protein. Plant Cell 2008, Aug 8 [Epub ahead of print]; Xu CC, Fan J, Froehlich JE, Awai K, Benning C. Mutation of the TGD1 chloroplast envelope protein affects phosphatidate metabolism in Arabidopsis. Plant Cell. 2005, 17(11): 3094-110; Xu CC, Fan JL, Riekhof W, Froehlich JE, Benning C. A permease-like protein involved in ER to thylakoid lipid transfer in Arabidopsis. EMBO Journal 2003, 22(10): 2370-2379; Awai K, Xu CC, Tamot B, Benning C. A phosphatidic acid-binding protein of the chloroplast inner envelope membrane involved in lipid trafficking. PNAS USA 2006 Jul 11, 103(28): 10817-22.]
Hosted by: John Shanklin
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