In enzymology, a fluorothreonine transaldolase (EC 2.2.1.8) is an enzyme that catalyzes the chemical reaction L-threonine + fluoroacetaldehyde acetaldehyde + 4-fluoro-L-threonine Thus, the two substrates of this enzyme are L-threonine and fluoroacetaldehyde, whereas its two products are acetaldehyde and 4-fluoro-L-threonine. 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 fluoroacetaldehyde:L-threonine aldehydetransferase.