EC 2.3.1.106     
Accepted name: tartronate O-hydroxycinnamoyltransferase
Reaction: sinapoyl-CoA + 2-hydroxymalonate = CoA + sinapoyltartronate
Glossary: sinapate = 4-hydroxy-3,5-dimethoxycinnamate
tartronate = 2-hydroxymalonate
Other name(s): tartronate sinapoyltransferase; hydroxycinnamoyl-coenzyme-A:tartronate hydroxycinnamoyltransferase
Systematic name: sinapoyl-CoA:2-hydroxymalonate O-(hydroxycinnamoyl)transferase
Comments: 4-Coumaroyl-CoA (4-hydroxycinnamoyl-CoA), caffeoyl-CoA (3,4-dihydroxycinnamoyl-CoA) and feruloyl-CoA (4-hydroxy-3-methoxycinnamoyl-CoA) can also act as donors for the enzyme from the mung bean (Vigna radiata).
References:
1.  Strack, D., Ruhoff, R. and Gräwe, W. Hydroxycinnamoyl-Coenzyme-A-tartronate hydroxycinnamoyltransferase in protein preparations from mung bean. Phytochemistry 25 (1986) 833–837.
[EC 2.3.1.106 created 1989, modified 1990, modified 2002]