Molybdenum cofactor sulfurtransferase (, molybdenum cofactor sulfurase, ABA3, MoCo sulfurase, MoCo sulfurtransferase) is an enzyme with systematic name L-cysteine:molybdenum cofactor sulfurtransferase. This enzyme catalyses the following chemical reaction
This enzyme characterised from Arabidopsis thaliana replaces the equatorial oxygen ligand atom attached to molybdenum by sulfur, which is provided from the amino acid L-cysteine. A reduced electron acceptor is required during the reaction and the enzyme contains pyridoxal phosphate.
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