2l7c

Biophysical studies of lipid interacting regions of DGD2 in Arabidopsis thaliana

spinqualitylabelsall models 2l7c, 23 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2l7c is a 1 chain structure with sequence from Arath. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Related: 1z2t Gene: DGD2, At4g00550, F6N23.24 (ARATH) Activity: Digalactosyldiacylglycerol synthase, with EC number 2.4.1.241 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum Function [DGDG2_ARATH] Involved in the synthesis of diacylglycerol galactolipids that are specifically found in thylakoid membranes. Specific for alpha-glycosidic linkages. Publication Abstract from PubMed Membrane lipid glycosyltransferases (GTs) in plants are enzymes that regulate the levels of the non-bilayer prone monogalactosyldiacylglycerol (GalDAG) and the bilayer-forming digalactosyldiacylglycerol (GalGalDAG). The relative amounts of these lipids affect membrane properties such as curvature and lateral stress. During phosphate shortage, phosphate is rescued by replacing phospholipids with GalGalDAG. The glycolsyltransferase enzyme in Arabidopsis thaliana responsible for this, atDGD2, senses the bilayer properties and interacts with the membrane in a monotopic manner. To understand the parameters that govern this interaction, we have identified several possible lipid-interacting sites in the protein and studied these by biophysical techniques. We have developed a multivariate discrimination algorithm that correctly predicts the regions in the protein that interact with lipids, and the interactions were confirmed by a variety of biophysical techniques. We show by bioinformatic methods and circular dichroism (CD), fluorescence, and NMR spectroscopic techniques that two regions are prone to interact with lipids in a surface-charge dependent way. Both of these regions contain Trp residues, but here charge appears to be the dominating feature governing the interaction. The sequence corresponding to residues 227-245 in the protein is seen to be able to adapt its structure according to the surface-charge density of a bilayer. All results indicate that this region interacts specifically with lipid molecules and that a second region in the protein, corresponding to residues 130-148, also interacts with the bilayer. On the basis of this, and sequence charge features in the immediate environment of S227-245, a response model for the interaction of atDGD2 with the membrane bilayer interface is proposed. Lipid interacting regions in phosphate stress glycosyltransferase atDGD2 from Arabidopsis thaliana.,Szpryngiel S, Ge C, Iakovleva I, Georgiev A, Lind J, Wieslander A, Maler L Biochemistry. 2011 May 31;50(21):4451-66. Epub 2011 May 4. PMID:21506606 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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