Stoichiometric model of the photosynthetic unit of Ectothiorhodospira halochloris | Zendy

Harald Engelhardt | Zendy; Andreas Engel | Zendy; Wolfgang Baumeister | Zendy

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Stoichiometric model of the photosynthetic unit of Ectothiorhodospira halochloris

Author(s) -

Harald Engelhardt,

Andreas Engel,

Wolfgang Baumeister

Publication year - 1986

Publication title -

proceedings of the national academy of sciences

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.011

H-Index - 771

eISSN - 1091-6490

pISSN - 0027-8424

DOI - 10.1073/pnas.83.23.8972

Subject(s) - periplasmic space , photosynthetic reaction centre , stoichiometry , photosynthesis , membrane , crystallography , cytochrome , biology , chemistry , biophysics , biochemistry , organic chemistry , escherichia coli , gene , enzyme

A stoichiometric model of the photosynthetic unit ofEctothiorhodospira halochloris has been obtained by means of scanning transmission electron microscope mass determination and mass mapping in conjunction with polyacrylamide gel electrophoresis. One reaction center, consisting of four single polypeptides, including one cytochrome, is surrounded by six identical light-harvesting complexes, each containing three polypeptides with 2:2:2 stoichiometry. This stoichiometric model was incorporated into the three-dimensional structure of the photosynthetic unit as derived from surface relief reconstructions of the two surfaces of shadowed membranes. The reaction center protrudes substantially from both membrane surfaces and has the cytochrome attached to the periplasmic face in a noncentrosymmetric fashion. The reaction center may assume various orientations within the photosynthetic complexes.

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