3wmm

Crystal structure of the LH1-RC complex from Thermochromatium tepidum in C2 form

spinqualitylabelsall models 3wmm, resolution 3.01Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3wmm is a 36 chain structure with sequence from Thermochromatium tepidum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 3.008Å Ligands: BPH, CA, CRT, FE, HEM, MQ8, PEF, PGW, PO4, UQ8 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function CYCR_THETI The reaction center of purple bacteria contains a tightly bound cytochrome molecule which re-reduces the photo oxidized primary electron donor.[PIRNR:PIRNR000017] Publication Abstract from PubMed The light-harvesting core antenna (LH1) and the reaction centre (RC) of purple photosynthetic bacteria form a supramolecular complex (LH1-RC) to use sunlight energy in a highly efficient manner. Here we report the first near-atomic structure, to our knowledge, of a LH1-RC complex, namely that of a Ca2+-bound complex from Thermochromatium tepidum, which reveals detailed information on the arrangement and interactions of the protein subunits and the cofactors. The RC is surrounded by 16 heterodimers of the LH1 alphabeta-subunit that form a completely closed structure. The Ca2+ ions are located at the periplasmic side of LH1. Thirty-two bacteriochlorophyll and 16 spirilloxanthin molecules in the LH1 ring form an elliptical assembly. The geometries of the pigment assembly involved in the absorption characteristics of the bacteriochlorophyll in LH1 and excitation energy transfer among the pigments are reported. In addition, possible ubiquinone channels in the closed LH1 complex are proposed based on the atomic structure. Structure of the LH1-RC complex from Thermochromatium tepidum at 3.0 A,Niwa S, Yu LJ, Takeda K, Hirano Y, Kawakami T, Wang-Otomo ZY, Miki K Nature. 2014 Mar 26. doi: 10.1038/nature13197. PMID:24670637 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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