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In enzymology, a chalcone isomerase is an enzyme that catalyzes the chemical reaction
Hence, this enzyme has one substrate, a chalcone, and one product, a flavanone.
This enzyme belongs to the family of isomerases, specifically the class of intramolecular lyases. The systematic name of this enzyme class is flavanone lyase. This enzyme is also called chalcone-flavanone isomerase. This enzyme participates in flavonoid biosynthesis.
The Petunia hybrida genome contains two genes coding for very similar enzymes, ChiA and ChiB, but only the first seems to encode a functional chalcone isomerase.
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