L-ribulose-5-phosphate 3-epimerase

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In enzymology, a L-ribulose-5-phosphate 3-epimerase (EC is an enzyme that catalyzes the chemical reaction

L-ribulose 5-phosphate L-xylulose 5-phosphate

Hence, this enzyme has one substrate, L-ribulose 5-phosphate, and one product, L-xylulose 5-phosphate.

This enzyme belongs to the family of isomerases, specifically those racemases and epimerases acting on carbohydrates and derivatives. The systematic name of this enzyme class is L-ribulose-5-phosphate 3-epimerase. Other names in common use include L-xylulose 5-phosphate 3-epimerase, UlaE, and SgaU. This enzyme participates in ascorbate and aldarate metabolism.


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  • Yew WS, Gerlt JA (2002). "Utilization of L-ascorbate by Escherichia coli K-12: assignments of functions to products of the yjf-sga and yia-sgb operons". J. Bacteriol. 184: 302&ndash, 6. PMID 11741871.

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