Accepted name: o-dihydroxycoumarin 7-O-glucosyltransferase
Reaction: UDP-glucose + 7,8-dihydroxycoumarin = UDP + daphnin
Other name(s): uridine diphosphoglucose-o-dihydroxycoumarin 7-O-glucosyltransferase; UDP-glucose:o-dihydroxycoumarin glucosyltransferase
Systematic name: UDP-glucose:7,8-dihydroxycoumarin 7-O-β-D-glucosyltransferase
Comments: Converts the aglycone daphetin into daphnin and, more slowly, esculetin into cichoriin, umbelliferone into skimmin, hydrangetin into hydrangin and scopoletin into scopolin.
1.  Ibrahim, R.K. and Boulay, B. Purification and some properties of UDP-glucose:o-hydroxycoumarin 7-O-glucosyltransferase from tobacco cell cultures. Plant Sci. Lett. 18 (1980) 177–184.
[EC created 1983]
Accepted name: coumarin 8-geranyltransferase
Reaction: (1) geranyl diphosphate + umbelliferone = diphosphate + 8-geranylumbelliferone
(2) geranyl diphosphate + esculetin = diphosphate + 8-geranylesculetin
Glossary: geranyl diphosphate = (2E)-3,7-dimethylocta-2,6-dien-1-yl diphosphate
esculetin = 6,7-dihydroxy-1-benzopyran-2-one = 6,7-dihydroxycoumarin
umbelliferone = 7-hydroxy-1-benzopyran-2-one = 7-hydroxycoumarin
Other name(s): ClPT1
Systematic name: geranyl-diphosphate:umbelliferone 8-geranyltransferase
Comments: The enzyme, characterized from the plant Citrus limon, is specific for geranyl diphosphate as a prenyl donor. It also has low activity with the coumarins 5,7-dihydroxycoumarin and 5-methoxy-7-hydroxycoumarin.
1.  Munakata, R., Inoue, T., Koeduka, T., Karamat, F., Olry, A., Sugiyama, A., Takanashi, K., Dugrand, A., Froelicher, Y., Tanaka, R., Uto, Y., Hori, H., Azuma, J., Hehn, A., Bourgaud, F. and Yazaki, K. Molecular cloning and characterization of a geranyl diphosphate-specific aromatic prenyltransferase from lemon. Plant Physiol. 166 (2014) 80–90. [PMID: 25077796]
[EC created 2017]