5ww3

Crystal structure of the second DNA-Binding protein under starvation from Mycobacterium smegmatis soaked with iron in the ratio of 24 iron atoms per dodecamer

spinqualitylabelsall models 5ww3, resolution 2.05Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5ww3 is a 4 chain structure with sequence from Mycolicibacterium smegmatis MC2 155. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.05Å Ligands: CL, FE, FE2, MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0QXB7_MYCS2 Publication Abstract from PubMed DNA-binding proteins under starvation (Dps) are dodecameric nano-compartments for iron oxidation and storage in bacterial cells. These proteins have roughly spherical structures with a hollow interior where iron is stored. Through mutational analysis of a conserved arginine residue in the second Dps protein from Mycobacterium smegmatis, we have identified residues which stabilize the interfaces between the iron entry and ferroxidation sites. Also, we have used X-ray crystallography to determine the structures of co-crystals of iron and Dps in varying proportions and compare the changes in these ligand-bound forms with respect to the apo-protein. The iron-loaded proteins of low, medium and high iron-bound forms were found to exhibit aspartate residues with alternate conformations, some of which could be directly linked to the sites of ferroxidation and iron entry. We conclude that the increased flexibility of aspartates in the presence of iron facilitates its movement from the entry site to the ferroxidaton site, and the two active sites are stabilized by the interactions of a conserved arginine residue R73. Flexible aspartates propel iron to the ferroxidation sites along pathways stabilized by a conserved arginine in Dps proteins from Mycobacterium smegmatis.,Williams SM, Chatterji D Metallomics. 2017 Jun 21;9(6):685-698. doi: 10.1039/c7mt00008a. PMID:28418062 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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