Three-dimensional structure of cyanobacterial photosystem I at 2.5 Å resolution

TitleThree-dimensional structure of cyanobacterial photosystem I at 2.5 Å resolution
Publication TypeJournal Article
Year of Publication2001
Refereed DesignationRefereed
AuthorsJordan, P., Fromme P., Witt H T., Klukas O., Saenger W., & Krauß N.
JournalNature
Volume411
Pagination909 - 917
ISSN00280836
Abstract

Life on Earth depends on photosynthesis, the conversion of light energy from the Sun to chemical energy. In plants, green algae and cyanobacteria, this process is driven by the cooperation of two large protein–cofactor complexes, photosystems I and II, which are located in the thylakoid photosynthetic membranes. The crystal structure of photosystem I from the thermophilic cyanobacterium Synechococcus elongatus described here provides a picture at atomic detail of 12 protein subunits and 127 cofactors comprising 96 chlorophylls, 2 phylloquinones, 3 Fe4S4 clusters, 22 carotenoids, 4 lipids, a putative Ca2+ ion and 201 water molecules. The structural information on the proteins and cofactors and their interactions provides a basis for understanding how the high efficiency of photosystem I in light capturing and electron transfer is achieved.

DOI10.1038/35082000
Short TitleNature