4inq | pdb_00004inq

Crystal structure of Osh3 ORD in complex with PI(4)P from Saccharomyces cerevisiae

spinqualitylabelsall models 4inq, resolution 2.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4inq is a 1 chain structure with sequence from Baker's yeast. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: PIF Related: 4iap, 4ic4 Gene: OSH3, YHR073W (Baker's yeast) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The oxysterol-binding protein (OSBP)-related proteins (ORPs) are conserved from yeast to humans, and implicated in the regulation of lipid homeostasis and in signaling pathways. Saccharomyces cerevisiae has seven ORPs (Osh1-Osh7) that share one unknown essential function. Here, we report the 1.5-2.3 A structures of the PH domain and ORD (OSBP-related domain) of yeast Osh3 in apo-form or in complex with phosphatidylinositol 4-phosphate (PI[4]P). Osh3 recognizes PI(4)P by the highly conserved residues in the tunnel of ORD whereas it lacks sterol binding due to the narrow hydrophobic tunnel. Yeast complementation tests suggest that PI(4)P binding to PH and ORD is essential for function. This study suggests that the unifying feature in all ORP homologs is the binding of PI(4)P to ORD and sterol binding is additional to certain homologs. Structural modeling of full-length Osh3 is consistent with the concept that Osh3 is a lipid transfer protein or regulator in membrane contact sites. Structure of osh3 reveals a conserved mode of phosphoinositide binding in oxysterol-binding proteins.,Tong J, Yang H, Yang H, Eom SH, Im YJ Structure. 2013 Jul 2;21(7):1203-13. doi: 10.1016/j.str.2013.05.007. Epub 2013, Jun 20. PMID:23791945 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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