Nitrogenase catalase

Figure 3-10 Estimation of the molecular mass of the polypeptide chain of the nitrogenase Fe-protein using SDS-poly-acrylamide electrophoresis from a set of four standard curves. The marker proteins are (1) catalase, (2) fumarase, (3) aldolase, (4) glyceraldehyde-phosphate dehydrogenase, (5) a-chymotrypsinogen A, and (6) myoglobin, (o) indicates position of azoferredoxin. From Nakos and Mortenson.195...

Dioxygen Related Ligands Iron Heme Proteins, Peroxidases, Catalases Catalase-peroxidases Nitrogenase Catalysis Assembly Vanadium Inorganic Coordination Chemistry Vanadium OrganometaUic Chemistry. 

Cytochrome oxidase Peroxidase, catalase Carbonic anhydrase Alcohol dehydrogenase Hexokinase Pyruvate kinase Glucose 6-phosphatase Pyruvate kinase Nitrogenase, nitrate reductase Glutathione peroxidase... 

It is of interest to note that the efficient enzymes, catalase, carbonic anhydrase and the nitrogenases have very small substrates (HjOj, CO2 and Nj, respectively) for which it is not easy to distinguish between reacting and non-reacting parts. It is a great challenge to quantitatively understand the forces of interaction between these substrates and their enzymes. 

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