4imh

Crystal Structure of Cytoplasmic Heme Binding Protein, PhuS, from Pseudomonas aeruginosa

spinqualitylabelsall models 4imh, resolution 1.98Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4imh is a 2 chain structure with sequence from Pseudomonas aeruginosa. 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 O68880_PSEAI Publication Abstract from PubMed Iron is an essential element to all living organisms and is an important determinant of bacterial virulence. Bacteria have evolved specialized systems to sequester and transport iron from the environment or host. Pseudomonas aeruginosa, an opportunistic pathogen, uses two outer membrane receptor mediated systems (Phu and Has) to utilize host heme as a source of iron. PhuS is a 39kDa soluble cytoplasmic heme binding protein which interacts and transports heme from the inner membrane heme transporter to the cytoplasm where it is degraded by heme oxygenase thus releasing iron. PhuS is unique among other cytoplasmic heme transporter proteins owing to the presence of three histidines in the heme binding pocket which can potentially serve as heme ligands. Out of the three histidine residues on the heme binding helix, His 209 is conserved among heme trafficking proteins while His 210 and His 212 are unique to PhuS. Here we report the crystal structure of PhuS at 1.98A resolution which shows a unique heme binding pocket and oligomeric structure compared to other known cytoplasmic heme transporter and accounts for some of the unusual biochemical properties of PhuS. Crystal structure of the Pseudomonas aeruginosa cytoplasmic heme binding protein, Apo-PhuS.,Tripathi S, O'Neill MJ, Wilks A, Poulos TL J Inorg Biochem. 2013 Jul 27;128C:131-136. doi: 10.1016/j.jinorgbio.2013.07.030. PMID:23973453 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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