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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. Access through your institution Buy or subscribe This is a preview of subscription content, access via your institution ACCESS OPTIONS

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institutional subscriptions * Read our FAQs * Contact customer support SIMILAR CONTENT BEING VIEWED BY OTHERS STRUCTURE OF THE FAR-RED LIGHT UTILIZING PHOTOSYSTEM I OF _ACARYOCHLORIS MARINA_

Article Open access 20 April 2021 ALGAL PHOTOSYSTEM I DIMER AND HIGH-RESOLUTION MODEL OF PSI-PLASTOCYANIN COMPLEX Article Open access 13 October 2022 STRUCTURE OF THE ACIDOBACTERIA

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of protein structures. _J. Appl. Crystallogr._ 24, 946–950 (1991). Article  Google Scholar  Download references AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Institut für Kristallographie,

Freie Universität Berlin, Takustr. 6, 0-14195, Berlin, Germany Norbert Krauß, Wolf-Dieter Schubert, Olaf Klukas & Wolfram Saenger * Max-Volmer-lnstitut für biophysikalische Chemie und

Biochemie, Technische Universität Berlin, Straße-des-17.Juni 135, D-10623, Berlin, Germany Petra Fromme & Horst Tobias Witt Authors * Norbert Krauß View author publications You can also

search for this author inPubMed Google Scholar * Wolf-Dieter Schubert View author publications You can also search for this author inPubMed Google Scholar * Olaf Klukas View author

publications You can also search for this author inPubMed Google Scholar * Petra Fromme View author publications You can also search for this author inPubMed Google Scholar * Horst Tobias

Witt View author publications You can also search for this author inPubMed Google Scholar * Wolfram Saenger View author publications You can also search for this author inPubMed Google

Scholar RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Krauß, N., Schubert, WD., Klukas, O. _et al._ Photosystem I at 4 Å resolution represents the

first structural model of a joint photosynthetic reaction centre and core antenna system. _Nat Struct Mol Biol_ 3, 965–973 (1996). https://doi.org/10.1038/nsb1196-965 Download citation *

Received: 03 May 1996 * Accepted: 05 September 1996 * Issue Date: 01 November 1996 * DOI: https://doi.org/10.1038/nsb1196-965 SHARE THIS ARTICLE Anyone you share the following link with will

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