Three-dimensional structure of system I of photosynthesis at 6 Å resolution
Abstract
X-ray structure analysis shows that the monomer of trimeric photosystem I (PS I) of Synechococcus sp. consists of a catalytic domain and a smaller domain that connects the monomers. The 4Fe-4S clusters FX,FA and FB, 28 α-helices and 45 chlorophyll a molecules were located. The two large subunits of PS I are represented by nine a-helices each; they are related by a local 2-fold rotation axis passing through Fx. Electron densities close to this axis are interpreted as carriers of the electron transfer chain.
- Publication:
-
Nature
- Pub Date:
- January 1993
- DOI:
- 10.1038/361326a0
- Bibcode:
- 1993Natur.361..326K