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the enzyme is involved in the mechanism of the ring contraction process during vitamin B12 biosynthesis, comparison to the ring contraction process reaction pathway under anaerobic conditions in Propionibacterium freudenreichii ssp. shermanii, overview
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biosynthesis of vitamin B12
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precorrin-3A + NADH + H+ + O2
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precorrin-3B + NAD+ + H2O
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precorrin-3A + NADH + H+ + O2
first step in the aerobic pathway of viamin B12 biosynthesis
precorrin-3B + NAD+ + H2O
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precorrin-3A + NADH + H+ + O2
the Brucella melitensis enzyme is fully active in vitro (20 mM Tris-HCl buffer, pH 8.0, with 100 mM NaCl, S-adenosyl-L-methionine (SAM), 5-aminolevulinic acid (ALA) and NADPH, aerobic, dark, 4°C) and the mononuclear non-heme iron is reducible by dithionite and then is able to react with NO as oxygen analogue in the presence of the substrate
precorrin-3B + NAD+ + H2O
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precorrin-3A + NADH + H+ + O2
the Pseudomonas denitrificans enzyme is active in vivo but inactive in vitro (20 mM Tris-HCl buffer, pH 8.0, with 100 mM NaCl, S-adenosyl-L-methionine (SAM), 5-aminolevulinic acid (ALA) and NADPH, aerobic, dark, 4°C), the mononuclear non-heme iron is not reducible and probably rapidly inactivated outside the bacterium
precorrin-3B + NAD+ + H2O
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precorrin-3A + NADH + H+ + O2
the Brucella melitensis enzyme is fully active in vitro (20 mM Tris-HCl buffer, pH 8.0, with 100 mM NaCl, S-adenosyl-L-methionine (SAM), 5-aminolevulinic acid (ALA) and NADPH, aerobic, dark, 4°C) and the mononuclear non-heme iron is reducible by dithionite and then is able to react with NO as oxygen analogue in the presence of the substrate
precorrin-3B + NAD+ + H2O
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precorrin-3A + NADH + O2
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precorrin-3B + NAD+ + H2O
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precorrin-3A + NADH + O2
the enzyme is involved in ring contraction, whereby an integral carbon atom of the tetrapyrrole-derived macrocycle is removed, and cobalt chelation during aerobic synthesis of vitamin B12, the catalytic cycle of CobZ, overview
precorrin-3B + NAD+ + H2O
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precorrin-3A + NADH + O2
the enzyme generates a hydroxy lactone intermediate
precorrin-3B + NAD+ + H2O
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