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UDP-beta-L-rhamnose + a flavanone 7-O-beta-D-glucoside
UDP + a flavanone 7-O-[alpha-L-rhamnosyl-(1->2)-beta-D-glucoside]
-
-
-
?
UDP-beta-L-rhamnose + naringenin-7-O-glucoside
UDP + naringenin 7-O-[alpha-L-rhamnosyl-(1->2)-beta-D-glucoside]
-
-
-
?
UDP-L-rhamnose + a flavanone 7-O-glucoside
UDP + a flavanone 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
UDP-L-rhamnose + apigenin 7-O-glucoside
UDP + apigenin 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
-
98% of the activity with hesperetin 7-O-glucoside as substrate, highly specific for UDP-rhamnose
-
-
?
UDP-L-rhamnose + diosmetin 7-O-glucoside
UDP + diosmetin 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
-
a flavone 7-O-glucoside
i.e. neodiosmin, a bitter 7-O-neohesperidoside
-
?
UDP-L-rhamnose + hesperetin 7-O-glucoside
UDP + hesperetin 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
UDP-L-rhamnose + luteolin 7-O-glucoside
UDP + luteolin 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
-
99% of the activity with hesperetin 7-O-glucoside as substrate, highly specific for UDP-rhamnose
-
-
?
UDP-L-rhamnose + naringenin 7-O-glucoside
UDP + naringenin 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
additional information
?
-
UDP-L-rhamnose + a flavanone 7-O-glucoside

UDP + a flavanone 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
-
glucosylated flavanone is further rhamnosylated by a rhamnosyltransferase using UDP-rhamnose
-
-
?
UDP-L-rhamnose + a flavanone 7-O-glucoside
UDP + a flavanone 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
-
glucosylated flavanone is further rhamnosylated by a rhamnosyltransferase using UDP-rhamnose
-
-
?
UDP-L-rhamnose + hesperetin 7-O-glucoside

UDP + hesperetin 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
-
-
i.e. neohesperidin
-
?
UDP-L-rhamnose + hesperetin 7-O-glucoside
UDP + hesperetin 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
-
-
i.e. neohesperidin, a bitter 7-O-neohesperidoside
-
?
UDP-L-rhamnose + hesperetin 7-O-glucoside
UDP + hesperetin 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
-
enzyme catalyzes the transfer of rhamnose from UDP-rhamnose to the C-2 hydroxyl group of glucose attached via C-7-O- of naringenin or hesperetin, lower activity than with naringenin 7-O-glucoside as substrate, highly specific for UDP-rhamnose
i.e. neohesperidin
-
?
UDP-L-rhamnose + hesperetin 7-O-glucoside
UDP + hesperetin 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
-
a flavanone 7-O-glucoside
i.e. neohesperidin, a bitter 7-O-neohesperidoside
-
?
UDP-L-rhamnose + hesperetin 7-O-glucoside
UDP + hesperetin 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
-
-
i.e. neohesperidin
-
?
UDP-L-rhamnose + naringenin 7-O-glucoside

UDP + naringenin 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
-
-
i.e. naringin, a bitter 7-O-neohesperidoside
-
?
UDP-L-rhamnose + naringenin 7-O-glucoside
UDP + naringenin 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
-
i.e. prunin, endogenous substrate, flavonoid biosynthetic pathway
i.e. naringin
-
?
UDP-L-rhamnose + naringenin 7-O-glucoside
UDP + naringenin 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
-
i.e. prunin, natural substrate
-
-
?
UDP-L-rhamnose + naringenin 7-O-glucoside
UDP + naringenin 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
-
i.e. prunin
i.e. naringin
-
?
UDP-L-rhamnose + naringenin 7-O-glucoside
UDP + naringenin 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
-
i.e. prunin, natural substrate, enzyme catalyzes the transfer of rhamnose from UDP-rhamnose to the C-2 hydroxyl group of glucose attached via C-7-O- of naringenin or hesperetin, best substrate, 141% of the activity with hesperetin 7-O-glucoside as substrate, highly specific for UDP-rhamnose
i.e. naringin
-
?
UDP-L-rhamnose + naringenin 7-O-glucoside
UDP + naringenin 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
-
a flavanone 7-O-glucoside
i.e. naringin, a bitter 7-O-neohesperidoside
-
?
UDP-L-rhamnose + naringenin 7-O-glucoside
UDP + naringenin 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
-
-
-
-
?
UDP-L-rhamnose + naringenin 7-O-glucoside
UDP + naringenin 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
-
i.e. prunin, endogenous substrate, flavonoid biosynthetic pathway
i.e. naringin
-
?
UDP-L-rhamnose + naringenin 7-O-glucoside
UDP + naringenin 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
-
i.e. prunin
i.e. naringin
-
?
UDP-L-rhamnose + naringenin 7-O-glucoside
UDP + naringenin 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
-
the enzyme is involved in the flavonoid biosynthesis pathway in grapefruit
-
-
?
additional information

?
-
-
enzyme catalyzes the production of bitter flavanone-glucosides
-
-
?
additional information
?
-
-
not: flavonoid 5-O-glucosides or aglycones, naringenin, hesperetin, quercetin, UDP-glucose, UDP-galactose, UDP-glucoronic acid
-
-
?
additional information
?
-
-
the enzyyme specifically catalyzes rhamnosylation of flavanone-7-O-glucose and flavone-7-O-glucose substrates at position 2 of the glucose moiety
-
-
?
additional information
?
-
-
the enzyme also catalyzes the rhamnosylation of diosmetin 7-O-glucoside at position 2 of the glucose moiety to give neodiosmin, but Cm1,2RhaT is specific for flavonoid-7-O-glucosides and utilizes no flavonoid-3-O-glucosides
-
-
?
additional information
?
-
Cm1,2RhaT has glycosyl transfer activity toward UDP-xylose as well as UDP-rhamnose, it is a branch-forming rhamnosyltransferase, substrate specificity of the recombinant enzyme, overview. No activity with quercetin-3-O-glucoside
-
-
?
additional information
?
-
-
Cm1,2RhaT has glycosyl transfer activity toward UDP-xylose as well as UDP-rhamnose, it is a branch-forming rhamnosyltransferase, substrate specificity of the recombinant enzyme, overview. No activity with quercetin-3-O-glucoside
-
-
?
additional information
?
-
-
flavonoid-7-O-glucosides are the preferred substrate. The enzyme Cit1,2RhaT converts flavonoid-7-O-glucosides into bitter-tasting flavonoid-7-O-neohesperidoside
-
-
-
additional information
?
-
-
flavanone-7-O-glucosides are catalysed by 1,2-rhamnosyltransferase to form bitter flavanone-7-O-neohesperidosides, such as naringin, neohsperidin, neoeriocitrin and poncirin
-
-
?
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UDP-L-rhamnose + diosmetin 7-O-glucoside
UDP + diosmetin 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
-
a flavone 7-O-glucoside
i.e. neodiosmin, a bitter 7-O-neohesperidoside
-
?
UDP-L-rhamnose + hesperetin 7-O-glucoside
UDP + hesperetin 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
-
-
i.e. neohesperidin, a bitter 7-O-neohesperidoside
-
?
UDP-L-rhamnose + naringenin 7-O-glucoside
UDP + naringenin 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
additional information
?
-
UDP-L-rhamnose + naringenin 7-O-glucoside

UDP + naringenin 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
-
-
i.e. naringin, a bitter 7-O-neohesperidoside
-
?
UDP-L-rhamnose + naringenin 7-O-glucoside
UDP + naringenin 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
-
i.e. prunin, endogenous substrate, flavonoid biosynthetic pathway
i.e. naringin
-
?
UDP-L-rhamnose + naringenin 7-O-glucoside
UDP + naringenin 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
-
i.e. prunin, natural substrate
-
-
?
UDP-L-rhamnose + naringenin 7-O-glucoside
UDP + naringenin 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
-
i.e. prunin, endogenous substrate, flavonoid biosynthetic pathway
i.e. naringin
-
?
UDP-L-rhamnose + naringenin 7-O-glucoside
UDP + naringenin 7-O-[beta-L-rhamnosyl-(1-2)-beta-D-glucoside]
-
the enzyme is involved in the flavonoid biosynthesis pathway in grapefruit
-
-
?
additional information

?
-
-
enzyme catalyzes the production of bitter flavanone-glucosides
-
-
?
additional information
?
-
-
the enzyyme specifically catalyzes rhamnosylation of flavanone-7-O-glucose and flavone-7-O-glucose substrates at position 2 of the glucose moiety
-
-
?
additional information
?
-
-
flavanone-7-O-glucosides are catalysed by 1,2-rhamnosyltransferase to form bitter flavanone-7-O-neohesperidosides, such as naringin, neohsperidin, neoeriocitrin and poncirin
-
-
?
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Lewinsohn, E.; Britsch, L.; Mazur, Y.; Gressel, J.
Flavanone glycoside biosynthesis in Citrus. Chalcone synthase, UDP-glucose: flavanone-7-O-glucosyltransferase and -rhamnosyltransferase activities in cell-free extracts
Plant Physiol.
91
1323-1328
1989
Citrus maxima, Citrus x paradisi
brenda
Bar-Peled, M.; Lewinsohn, E.; Fluhr, R.; Gressel, J.
UDP-rhamnose:flavanone-7-O-glucoside-2''-O-rhamnosyltransferase. Purification and characterization of an enzyme catalyzing the production of bitter compounds in citrus
J. Biol. Chem.
266
20953-20959
1991
Citrus maxima
brenda
Frydman, A.; Weisshaus, O.; Huhman, D.V.; Sumner, L.W.; Bar-Peled, M.; Lewinsohn, E.; Fluhr, R.; Gressel, J.; Eyal, Y.
Metabolic engineering of plant cells for biotransformation of hesperedin into neohesperidin, a substrate for production of the low-calorie sweetener and flavor enhancer NHDC
J. Agric. Food Chem.
53
9708-9712
2005
Citrus maxima (Q8GVE3)
brenda
Frydman, A.; Liberman, R.; Huhman, D.V.; Carmeli-Weissberg, M.; Sapir-Mir, M.; Ophir, R.; W Sumner, L.; Eyal, Y.
The molecular and enzymatic basis of bitter/non-bitter flavor of citrus fruit: evolution of branch-forming rhamnosyltransferases under domestication
Plant J.
73
166-178
2013
Citrus maxima, Citrus sinensis, Citrus sinensis valencia, no activity in Citrus reticulata
brenda
Ohashi, T.; Hasegawa, Y.; Misaki, R.; Fujiyama, K.
Substrate preference of citrus naringenin rhamnosyltransferases and their application to flavonoid glycoside production in fission yeast
Appl. Microbiol. Biotechnol.
100
687-696
2016
Citrus maxima (A0A0P0YNP7), Citrus maxima
brenda
Chen, J.; Zhang, H.; Pang, Y.; Cheng, Y.; Deng, X.; Xu, J.
Comparative study of flavonoid production in lycopene-accumulated and blonde-flesh sweet oranges (Citrus sinensis) during fruit development
Food Chem.
184
238-246
2015
Citrus sinensis
brenda
Chaudhary, P.R.; Bang, H.; Jayaprakasha, G.K.; Patil, B.S.
Variation in key flavonoid biosynthetic enzymes and phytochemicals in Rio Red Grapefruit (Citrus paradisi Macf.) during fruit development
J. Agric. Food Chem.
64
9022-9032
2016
Citrus x paradisi
brenda
Chen, J.; Yuan, Z.; Zhang, H.; Li, W.; Shi, M.; Peng, Z.; Li, M.; Tian, J.; Deng, X.; Cheng, Y.; Deng, C.H.; Xie, Z.; Zeng, J.; Yao, J.L.; Xu, J.
Cit1,2RhaT and two novel CitdGlcTs participate in flavor-related flavonoid metabolism during citrus fruit development
J. Exp. Bot.
70
2759-2771
2019
Citrus reticulata x Citrus trifoliata
brenda