Involved in the production of glucuronosylated baicalein, a flavonoid that shows antiallergic, anti-HIV and antitumor activities. Can use baicalein, scutellarein and wogonin as substrates, but not chrysin, apigenin, luteolin, quercetin, formononetin and daidzein. Highly specific for UDP-glucuronate (UDP-GlcUA) and no activity with UDP-glucose or UDP-galacturonic acid. baicalein + UDP-alpha-D-glucuronate = baicalin + UDP Inhibited by copper, zinc and iron, p-Chloromercuri-benzoic acid (PCMBA) and 4,4'-diisothiocyanostilbene-2,2'-disulfonic acid (DIDS), but not by N-ethylmaleimide (NEM), dithioerythritol (DTE), calcium or magnesium. Optimum pH is 7.5. Optimum temperature is 30-40 degrees Celsius. Homodimer. Belongs to the UDP-glycosyltransferase family.