Isomerases are a general class of enzymes that convert a molecule from one isomer to another. Isomerases facilitate intramolecular rearrangements in which bonds are broken and formed. The general form of such a reaction is as follows:
A heptose is a monosaccharide with seven carbon atoms.
Ribulose is a ketopentose — a monosaccharide containing five carbon atoms, and including a ketone functional group. It has chemical formula C5H10O5. Two enantiomers are possible, d-ribulose and l-ribulose. d-Ribulose is the diastereomer of d-xylulose.
The L-arabinose operon, also called the ara or araBAD operon, is an operon required for the breakdown of the five-carbon sugar L-arabinose in Escherichia coli. The L-arabinose operon contains three structural genes: araB, araA, araD, which encode for three metabolic enzymes that are required for the metabolism of L-arabinose. AraB (ribulokinase), AraA, AraD produced by these genes catalyse conversion of L-arabinose to an intermediate of the pentose phosphate pathway, D-xylulose-5-phosphate.
In enzymology, a 4-deoxy-L-threo-5-hexosulose-uronate ketol-isomerase is an enzyme that catalyzes the chemical reaction
In enzymology, an arabinose isomerase is an enzyme that catalyzes the chemical reaction
In enzymology, a D-lyxose ketol-isomerase is an enzyme that catalyzes the chemical reaction
In enzymology, a galactose-6-phosphate isomerase is an enzyme that catalyzes the chemical reaction
In enzymology, a glucuronate isomerase is an enzyme that catalyzes the chemical reaction
In enzymology, a hydroxypyruvate isomerase is an enzyme that catalyzes the chemical reaction
In enzymology, a L-arabinose isomerase is an enzyme that catalyzes the chemical reaction
In enzymology, a L-rhamnose isomerase is an enzyme that catalyzes the chemical reaction
In enzymology, a L-ribulose-5-phosphate 4-epimerase is an enzyme that catalyzes the interconversion of ribulose 5-phosphate and xylulose 5-phosphate in the oxidative phase of the Pentose phosphate pathway.
In enzymology, a mannose isomerase is an enzyme that catalyzes the chemical reaction
In enzymology, a phosphoribosylanthranilate isomerase (PRAI) is an enzyme that catalyzes the third step of the synthesis of the amino acid tryptophan.
Ribose-5-phosphate isomerase (Rpi) encoded by the RPIA gene is an enzyme that catalyzes the conversion between ribose-5-phosphate (R5P) and ribulose-5-phosphate (Ru5P). It is a member of a larger class of isomerases which catalyze the interconversion of chemical isomers. It plays a vital role in biochemical metabolism in both the pentose phosphate pathway and the Calvin cycle. The systematic name of this enzyme class is D-ribose-5-phosphate aldose-ketose-isomerase.
In enzymology, a ribose isomerase is an enzyme that catalyzes the chemical reaction
In enzymology, a S-methyl-5-thioribose-1-phosphate isomerase is an enzyme that catalyzes the chemical reaction
D-sedoheptulose 7-phosphate isomerase is an enzyme with systematic name D-glycero-D-manno-heptose 7-phosphate aldose-ketose-isomerase. This enzyme catalyses the following chemical reaction
In enzymology, a xylose isomerase is an enzyme that catalyzes the interconversion of D-xylose and D-xylulose. This enzyme belongs to the family of isomerases, specifically those intramolecular oxidoreductases interconverting aldoses and ketoses. The isomerase has now been observed in nearly a hundred species of bacteria. Xylose-isomerases are also commonly called fructose-isomerases due to their ability to interconvert glucose and fructose. The systematic name of this enzyme class is D-xylose aldose-ketose-isomerase. Other names in common use include D-xylose isomerase, D-xylose ketoisomerase, and D-xylose ketol-isomerase.
