O-phosphoserine sulfhydrylase

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O-phosphoserine sulfhydrylase
Identifiers
EC no. 2.5.1.65
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In enzymology, an O-phosphoserine sulfhydrylase (EC 2.5.1.65) is an enzyme that catalyzes the chemical reaction

O-phospho-L-serine + hydrogen sulfide L-cysteine + phosphate

Thus, the two substrates of this enzyme are O-phospho-L-serine and hydrogen sulfide, whereas its two products are L-cysteine and phosphate.

This enzyme belongs to the family of transferases, specifically those transferring aryl or alkyl groups other than methyl groups. The systematic name of this enzyme class is O-phospho-L-serine:hydrogen-sulfide 2-amino-2-carboxyethyltransferase. This enzyme is also called O-phosphoserine(thiol)-lyase. This enzyme participates in cysteine metabolism and sulfur metabolism.

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<i>O</i>-Acetylserine Chemical compound

O-Acetylserine is an α-amino acid with the chemical formula HO2CCH(NH2)CH2OC(O)CH3. It is an intermediate in the biosynthesis of the common amino acid cysteine in bacteria and plants. O-Acetylserine is biosynthesized by acetylation of the serine by the enzyme serine transacetylase. The enzyme O-acetylserine (thiol)-lyase, using sulfide sources, converts this ester into cysteine, releasing acetate:

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References