4hh3 | pdb_00004hh3

Structure of the AppA-PpsR2 core complex from Rb. sphaeroides

spinqualitylabelsall models 4hh3, resolution 1.75Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4hh3 is a 3 chain structure with sequence from Cereibacter sphaeroides and Cereibacter sphaeroides 2.4.1. 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 Q3J179_CERS4 Publication Abstract from PubMed The anoxygenic phototrophic bacterium Rhodobacter sphaeroides uses different energy sources, depending on environmental conditions including aerobic respiration or, in the absence of oxygen, photosynthesis. Photosynthetic genes are repressed at high oxygen tension, but at intermediate levels their partial expression prepares the bacterium for using light energy. Illumination, however, enhances repression under semiaerobic conditions. Here, we describe molecular details of two proteins mediating oxygen and light control of photosynthesis-gene expression: the light-sensing antirepressor AppA and the transcriptional repressor PpsR. Our crystal structures of both proteins and their complex and hydrogen/deuterium-exchange data show that light activation of AppA-PpsR2 affects the PpsR effector region within the complex. DNA binding studies demonstrate the formation of a light-sensitive ternary AppA-PpsR-DNA complex. We discuss implications of these results for regulation by light and oxygen, highlighting new insights into blue light-mediated signal transduction. A ternary AppA-PpsR-DNA complex mediates light regulation of photosynthesis-related gene expression.,Winkler A, Heintz U, Lindner R, Reinstein J, Shoeman RL, Schlichting I Nat Struct Mol Biol. 2013 Jul;20(7):859-67. doi: 10.1038/nsmb.2597. Epub 2013 Jun, 2. PMID:23728293 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also AppA protein BLUF domain

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