5v8k

Homodimeric reaction center of H. modesticaldum

spinqualitylabelsall models 5v8k, resolution 2.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5v8k is a 2 chain structure with sequence from Heliomicrobium modesticaldum and Heliomicrobium modesticaldum Ice1. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.2Å Ligands: C4D, CA, DGG, GB0, GBF, LMT Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q1MX24_9FIRM Publication Abstract from PubMed Reaction centers are pigment-protein complexes that drive photosynthesis by converting light into chemical energy. It is believed that they arose once from a homodimeric protein. The symmetry of a homodimer is broken in heterodimeric reaction center structures, such as those reported previously. The 2.2-A resolution X-ray structure of the homodimeric reaction center/photosystem from the phototroph, Heliobacterium modesticaldum, exhibits perfect C2 symmetry. The core polypeptide dimer and two small subunits coordinate 54 (bacterio)chlorophylls and 2 carotenoids that capture and transfer energy to the electron transfer chain at the center, which performs charge separation and consists of 6 (bacterio)chlorophylls and an iron-sulfur cluster; unlike other reaction centers, it lacks a bound quinone. This structure preserves characteristics of the ancestral reaction center, providing insight into evolution of photosynthesis. Structure of a symmetric photosynthetic reaction center-photosystem.,Gisriel C, Sarrou I, Ferlez B, Golbeck JH, Redding KE, Fromme R Science. 2017 Jul 27. pii: eaan5611. doi: 10.1126/science.aan5611. PMID:28751471 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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