4fln

Crystal structure of plant protease Deg2

spinqualitylabelsall models 4fln, resolution 2.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4fln is a 6 chain structure with sequence from Arabidopsis thaliana and Unidentified. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function DEGP2_ARATH Serine protease that performs the primary cleavage of the photodamaged D1 protein in plant photosystem II. Publication Abstract from PubMed Eukaryotic organelles have developed elaborate protein quality control systems to ensure their normal activity, among which Deg/HtrA proteases play an essential role. Plant Deg2 protease is a homologue of prokaryotic DegQ/DegP proteases and located in the chloroplast stroma, where its proteolytic activity is required to maintain the efficiency of photosynthetic machinery during stress. Here, we demonstrate that Deg2 exhibits dual protease-chaperone activities, and present the hexameric structure of Deg2 complexed with co-purified peptides. The structure shows that Deg2 contains a unique second PDZ domain (PDZ2) following a conventional PDZ domain (PDZ1), with PDZ2 orchestrating the cage assembly of Deg2. We discover a conserved internal ligand for PDZ2 that mediates hexamer formation, thus locks the protease in the resting state. These findings provide insight into the diverse modes of PDZ-mediated regulation of Deg proteases. Crystal structure of Arabidopsis Deg2 reveals an internal PDZ ligand locking the hexameric resting state.,Sun R, Fan H, Gao F, Lin Y, Zhang L, Gong W, Liu L J Biol Chem. 2012 Sep 7. PMID:22961982 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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