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Cytochrome cbb 3 is a cytochrome c-oxidising isoenzyme that belongs to the superfamily of respiratory haem/copper oxidases. We have developed a purification method yielding large amounts of pure cbb 3 complex from the soil bacterium Pseudomonas stutzeri. This cytochrome cbb 3 complex consists of three subunits (ccoNOP) in a 1:1:1 stoichiometry and contains two b-type and three...
Nitric oxide reductases (NORs) that are found in bacteria belong to the large enzyme family which includes cytochrome oxidases. Two types of bacterial NORs have been characterised. One is a cytochrome bc-type complex (cNOR) that receives electrons from soluble redox protein donors, whereas the other type (qNOR) lacks the cytochrome c component and uses quinol as the electron donor. The latter enzyme...
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