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Structure
The molybdenum centre has a square pyramidal geometry and is distinguished from the xanthine oxidase family by the orientation of the oxo group facing downwards rather than up.

Vertebrates
X-ray crystallography has confirmed the structure of sulfite oxidase enzymes from chickens. It is a homodimer with two N-terminal heme groups that are very similar in structure and sequence to that of cytochrome b5. Each domain is connected via a 12-15 long amino acid chain to the molybdenum centre.

Plants
X-ray crystallography has confirmed the structure of sulfite oxidase enzymes from A. thaliana . This enzyme is similar in structure to that of vertebrates but does not contain the heme domain, making the molybdenum centre the only redox active site.

Mechanism
Electrons are passed one at a time from the molybdenum to the heme group which reacts with cytochrome c to reoxidize the enzyme. The electrons from this reaction enter the electron transport chain (ETC).

Reductive half reaction
This reaction is generally the rate limiting reaction. Upon reaction of the enzyme with sulfite, it is reduced by 2 electrons. The negative potential seen with re-reduction of the enzyme shows the oxidized state is favoured.

Oxidative half reaction
Among the Mo enzyme classes, sulfite oxidase is the most easily oxidized. Although under low pH conditions the oxidative reaction become partially rate limiting.





Properties of Methyl Oleate

 * Molecular formula: C19H36O2
 * Molar mass: 296.49 g/mol
 * Melting point: -20 °C
 * Boiling point: 350 °C
 * Solubility in water: insoluble

Methyl Oleate

Methyl Oleate

Internal link: Oleic acid

External link: Fischer Scientific - Methyl Oleate

Energy Transduction in Nitrogenase

Biosynthesis of Nitrogenase Metalloclusters

Nitrogenase assembly

Critique of Carbonic Anhydrase Mechanism Figure
The mechanism does not look professionally drawn. Not all bond lengths are equal or in the right orientation. The arrows are not a good size and specifically the arrow showing water being added is not properly drawn.

$$x_1=\left ( \frac{y}{2} \right )^2 $$