Characterization of the heme in human cystathionine beta-synthase by X-ray absorption and electron paramagnetic resonance spectroscopies.


Human cystathionine beta-synthase is one of two key enzymes involved in intracellular metabolism of homocysteine. It catalyzes a beta-replacement reaction in which the thiolate of homocysteine replaces the hydroxyl group of serine to give the product, cystathionine. The enzyme is unusual in its dependence on two cofactors: pyridoxal phosphate and heme. The… (More)


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