3sw1 | pdb_00003sw1

Structure of a full-length bacterial LOV protein

spinqualitylabelsall models 3sw1, resolution 2.63Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3sw1 is a 2 chain structure with sequence from Psepk. The March 2015 RCSB PDB Molecule of the Month feature on Phototropin by David Goodsell is 10.2210/rcsb_pdb/mom_2015_3. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: FMN Gene: PP4629 (PSEPK) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Blue-light photoreceptors containing light-oxygen-voltage (LOV) domains regulate a myriad of different physiological responses in both eukaryotes and prokaryotes. Their light sensitivity is intricately linked to the photochemistry of the non-covalently bound flavin mononucleotide (FMN) chromophore that forms a covalent adduct with a conserved cysteine residue in the LOV domain upon illumination with blue light. All LOV domains undergo the same primary photochemistry leading to adduct formation; however, considerable variation is found in the lifetime of the adduct state that varies from seconds to several hours. The molecular mechanism underlying this variation among the structurally conserved LOV protein family is not well understood. Here, we describe the structural characterization of PpSB1-LOV, a very slow cycling full-length LOV protein from the Gram-negative bacterium Pseudomonas putida KT2440. Its crystal structure reveals a novel dimer interface that is mediated by N- and C-terminal auxiliary structural elements and a unique cluster of four arginine residues coordinating with the FMN-phosphate moiety. Site-directed mutagenesis of two arginines (R61 and R66) in PpSB1-LOV resulted in acceleration of the dark recovery reaction approximately by a factor of 280. The presented structural and biochemical data suggest a direct link between structural features and the slow dark recovery observed for PpSB1-LOV. The overall structural arrangement of PpSB1-LOV, together with a complementary phylogenetic analysis, highlights a common ancestry of bacterial LOV photoreceptors and Per-ARNT-Sim chemosensors. Structural basis for the slow dark recovery of a full-length LOV protein from Pseudomonas putida.,Circolone F, Granzin J, Jentzsch K, Drepper T, Jaeger KE, Willbold D, Krauss U, Batra-Safferling R J Mol Biol. 2012 Apr 6;417(4):362-74. Epub 2012 Feb 7. PMID:22326872 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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