Abstract
The nitrogenase activity (measured by N 2 or acetylene reduction) of cell-free extracts of the photosynthetic bacterium Chromatium was coupled to photochemically generated ATP and reductant. The ATP was formed through cyclic photophosphorylation by bacterial chromatophores. The reductant (reduced ferredoxin) was generated by a heated preparation (incapable of O 2 and ATP production) of spinach chloroplasts. The nitrogenase activity of Chromatium extracts was supported by reduced Chromatium or Clostridium pasteurianum ferredoxin but not by that of spinach chloroplasts.
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