Primary Citation of Related Structures:   7N8O, 7RCV
PubMed Abstract: 
Photosystem II (PSII) enables global-scale, light-driven water oxidation. Genetic manipulation of PSII from the mesophilic cyanobacterium Synechocystis sp. PCC 6803 has provided insights into the mechanism of water oxidation; however, the lack of a high-resolution structure of oxygen-evolving PSII from this organism has limited the interpretation of biophysical data to models based on structures of thermophilic cyanobacterial PSII. Here, we report the cryo-electron microscopy structure of PSII from Synechocystis sp. PCC 6803 at 1.93-Å resolution. A number of differences are observed relative to thermophilic PSII structures, including the following: the extrinsic subunit PsbQ is maintained, the C terminus of the D1 subunit is flexible, some waters near the active site are partially occupied, and differences in the PsbV subunit block the Large (O1) water channel. These features strongly influence the structural picture of PSII, especially as it pertains to the mechanism of water oxidation.
Organizational Affiliation: 
Department of Chemistry, Yale University, New Haven, CT 06520.
AE [auth H] CB [auth A] CC [auth B] DB [auth A] GI [auth f]
AE [auth H], CB [auth A], CC [auth B], DB [auth A], GI [auth f], HE [auth K], KF [auth a], KI [auth h], NF [auth a], OF [auth a], PE [auth T], RI [auth k], WD [auth F], ZA [auth A]
1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL C41 H78 O12 S RVUUQPKXGDTQPG-JUDHQOGESA-N