1c51

PHOTOSYNTHETIC REACTION CENTER AND CORE ANTENNA SYSTEM (TRIMERIC), ALPHA CARBON ONLY

spinqualitylabelsall models 1c51, resolution 4.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1c51 is a 8 chain structure with sequence from Synechococcus elongatus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CLA, PQN, SF4 NonStd Res: UNK Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum Publication Abstract from PubMed An improved electron density map of photosystem I (PSI) calculated at 4-A resolution yields a more detailed structural model of the stromal subunits PsaC, PsaD, and PsaE than previously reported. The NMR structure of the subunit PsaE of PSI from Synechococcus sp. PCC7002 (Falzone, C. J., Kao, Y.-H., Zhao, J., Bryant, D. A., and Lecomte, J. T. J. (1994) Biochemistry 33, 6052-6062) has been used as a model to interpret the region of the electron density map corresponding to this subunit. The spatial orientation with respect to other subunits is described as well as the possible interactions between the stromal subunits. A first model of PsaD consisting of a four-stranded beta-sheet and an alpha-helix is suggested, indicating that this subunit partly shields PsaC from the stromal side. In addition to the improvements on the stromal subunits, the structural model of the membrane-integral region of PSI is also extended. The current electron density map allows the identification of the N and C termini of the subunits PsaA and PsaB. The 11-transmembrane alpha-helices of these subunits can now be assigned uniquely to the hydrophobic segments identified by hydrophobicity analyses. Photosystem I, an improved model of the stromal subunits PsaC, PsaD, and PsaE.,Klukas O, Schubert WD, Jordan P, Krauss N, Fromme P, Witt HT, Saenger W J Biol Chem. 1999 Mar 12;274(11):7351-60. PMID:10066799 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Photosystem I

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