EC 2.4.1.190     
Accepted name: luteolin-7-O-glucuronide 2′′-O-glucuronosyltransferase
Reaction: UDP-α-D-glucuronate + luteolin 7-O-β-D-glucuronide = UDP + luteolin 7-O-[β-D-glucuronosyl-(1→2)-β-D-glucuronide]
Other name(s): uridine diphosphoglucuronate-luteolin 7-O-glucuronide glucuronosyltransferase; LMT; UDP-glucuronate:luteolin 7-O-glucuronide-glucuronosyltransferase; UDP-glucuronate:luteolin-7-O-β-D-glucuronide 2′′-O-glucuronosyltransferase
Systematic name: UDP-α-D-glucuronate:luteolin-7-O-β-D-glucuronide 2′′-O-glucuronosyltransferase (configuration-inverting)
Comments: The enzyme participates in the biosynthesis of luteolin triglucuronide, the major flavone found in the photosynthetically-active mesophyll of the primary leaves of Secale cereale (rye).
References:
1.  Schulz, M. and Weissenböck, G. 3 specific UDP-glucuronate-flavone-glucuronosyl-transferases from primary leaves of Secale cereale. Phytochemistry 27 (1988) 1261–1267.
2.  Anhalt, S. and Weissenböck, G. Subcellular localization of luteolin glucuronides and related enzymes in rye mesophyll. Planta 187 (1992) 83–88. [PMID: 24177970]
[EC 2.4.1.190 created 1992]