Localization of two phylloquinones, Q(K) and Q(K)', in an improved electron density map of photosystem I at 4-Å resolution

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

Research output: Contribution to journalArticlepeer-review

74 Scopus citations

Abstract

An improved electron density map of photosystem I from Synechococcus elongatus calculated at 4-Å resolution for the first time reveals a second phylloquinone molecule and thereby completes the set of cofactors constituting the electron transfer system of this iron-sulfur type photosynthetic reaction center: six chlorophyll a, two phylloquinones, and three Fe4S4 clusters. The location of the newly identified phylloquinone pair, the individual plane orientations of these molecules, and the resulting distances to other cofactors of the electron transfer system are discussed and compared with those determined by magnetic resonance techniques.

Original languageEnglish (US)
Pages (from-to)7361-7367
Number of pages7
JournalJournal of Biological Chemistry
Volume274
Issue number11
DOIs
StatePublished - Mar 12 1999
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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