In enzymology, a 13-hydroxylupinine O-tigloyltransferase () is an enzyme that catalyzes the chemical reaction (E)-2-methylcrotonoyl-CoA + 13-hydroxylupinine CoA + 13-(2-methylcrotonoyl)oxylupinine Thus, the two substrates of this enzyme are (E)-2-methylcrotonoyl-CoA and 13-hydroxylupinine, whereas its two products are CoA and 13-(2-methylcrotonoyl)oxylupinine. This enzyme belongs to the family of transferases, specifically those acyltransferases transferring groups other than aminoacyl groups. The systematic name of this enzyme class is (E)-2-methylcrotonoyl-CoA:13-hydroxylupinine O-2-methylcrotonoyltransferase. Other names in common use include tigloyl-CoA:13-hydroxylupanine O-tigloyltransferase, and 13-hydroxylupanine acyltransferase. References EC 2.3.1 Enzymes of unknown structure