Acetoin-ribose-5-phosphate transaldolase () is an enzyme that catalyzes a chemical reaction whch produces 1-deoxy-D-altro-heptulose phosphate from the sugar phosphate, ribose 5-phosphate and acetoin, with acetaldehyde as a byproduct. The enzyme was characterised from Bacillus pumilus.
This enzyme belongs to the family of transferases, specifically those transferring aldehyde or ketonic groups (transaldolases and transketolases, respectively). The systematic name of this enzyme class is 3-hydroxybutan-2-one:D-ribose-5-phosphate aldehydetransferase. Other names in common use include 1-deoxy-D-altro-heptulose-7-phosphate synthetase, 1-deoxy-D-altro-heptulose-7-phosphate synthase, 3-hydroxybutan-2-one:D-ribose-5-phosphate aldehydetransferase [wrong, and substrate name]. It uses one cofactor, thiamin diphosphate.
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