Photosystem I at 4 Å resolution represents the first structural model of a joint otosynthetic reaction centre and core antenna system

Norbert Krauß, Wolf Dieter Schubert, Olaf Klukas, Petra Fromme, Horst Tobias Witt, Wolfram Saenger

Research output: Contribution to journalArticle

303 Citations (Scopus)

Abstract

The 4 Å X-ray structure model of trimeric photosystem I of the cyanobacterium Synechococcus elongatus reveals 31 transmembrane, nine surface and three stromal α-helices per monomer, assigned to the 11 protein subunits: PsaA and PsaB are related by a pseudo two-fold axis normal to the membrane plane, along which the electron transfer pigments are arranged. 65 antenna chlorophyll a (Chl a) molecules separated by ≤16 Å form an oval, clustered net, continuous with the electron transfer chain through the second and third Chl a pairs of the electron transfer system. This suggests a dual role for these Chl a both in excitation energy and electron transfer. The architecture of the protein core indicates quinone and iron-sulphur type reaction centres to have a common ancestor.

Original languageEnglish (US)
Pages (from-to)965-973
Number of pages9
JournalNature Structural Biology
Volume3
Issue number11
DOIs
StatePublished - Nov 1996
Externally publishedYes

Fingerprint

Photosystem I Protein Complex
Structural Models
Joints
Electrons
Antennas
Synechococcus
Excitation energy
Energy Transfer
Protein Subunits
Cyanobacteria
Model structures
Sulfur
Pigments
Iron
Monomers
X-Rays
Membranes
X rays
Molecules
chlorophyll a

ASJC Scopus subject areas

  • Biochemistry
  • Structural Biology
  • Genetics

Cite this

Photosystem I at 4 Å resolution represents the first structural model of a joint otosynthetic reaction centre and core antenna system. / Krauß, Norbert; Schubert, Wolf Dieter; Klukas, Olaf; Fromme, Petra; Witt, Horst Tobias; Saenger, Wolfram.

In: Nature Structural Biology, Vol. 3, No. 11, 11.1996, p. 965-973.

Research output: Contribution to journalArticle

Krauß, Norbert ; Schubert, Wolf Dieter ; Klukas, Olaf ; Fromme, Petra ; Witt, Horst Tobias ; Saenger, Wolfram. / Photosystem I at 4 Å resolution represents the first structural model of a joint otosynthetic reaction centre and core antenna system. In: Nature Structural Biology. 1996 ; Vol. 3, No. 11. pp. 965-973.
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