Ribulose-phosphate 3-epimerase-like (IPR000056)

Short name: Ribul_P_3_epim-like

Overlapping homologous superfamilies

Family relationships


Ribulose-phosphate 3-epimerase (EC: (also known as RPE, pentose-5-phosphate 3-epimerase or PPE) is the enzyme that converts D-ribulose 5-phosphate (Ru5P) into D-xylulose 5-phosphate in Calvin's reductive pentose phosphate cycle. In Ralstonia eutropha (Alcaligenes eutrophus) two copies of the gene coding for PPE are known [PMID: 1429456], one is chromosomally encoded P40117, the other one is on a plasmid Q04539. PPE has been found in a wide range of bacteria, archaebacteria, fungi and plants. All the proteins have from 209 to 241 amino acid residues. The enzyme has a TIM barrel structure.

This family also includes other enzymes from the ribulose-phosphate 3-epimerase family, like D-allulose-6-phosphate 3-epimerase and other putative pentose-5-phosphate 3-epimerases. D-allulose-6-phosphate 3-epimerase catalyses the reversible epimerization of D-allulose 6-phosphate to D-fructose 6-phosphate, but it can also catalyse with lower efficiency the reversible epimerization of D-ribulose 5-phosphate to D-xylulose 5-phosphate [PMID: 18700786].

GO terms

Biological Process

GO:0005975 carbohydrate metabolic process

Molecular Function

GO:0016857 racemase and epimerase activity, acting on carbohydrates and derivatives

Cellular Component

No terms assigned in this category.

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.
PROSITE patterns
PROSITE patterns