Photolysis of water coupled to nitrate reduction by Nostoc muscorum subcellular particles

Abstract

Subcellular particles from the blue-green alga Nostoc muscorum contain ferredoxin-nitrate reductase and can use NADPH to reduce nitrate in a ferredoxin-dependent reaction through a NADP-reductase system. Likewise, evidence is provided that a ferredoxin-dependent photoreduction of nitrate to nitrite by water coupled to stoichiometric oxygen evolution takes place in cell-free preparations of this alga.