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Separation, purification and characterization of three isoenzymes of UDP-glucuronyltransferase from rat liver microsomes.

Abstract：

:Three isoenzymes of UDP-glucuronyltransferase (UDPGT) have been separated and purified from liver microsomes of untreated female rats or female rats pretreated with 3-methylcholanthrene. The UDPGT isoenzymes were purified utilizing Chromatofocusing, column isoelectric focusing, and UDP-hexanolamine Sepharose 4B affinity chromatography. UDPGT activities could also be separated during UDP-hexanolamine affinity chromatography by elution with different UDPGA (UDP-glucuronic acid) concentrations. One isoenzyme exhibits a subunit molecular weight of 56,000 and is capable of conjugating p-nitrophenol, 1-naphthol, and 4-methylumbelliferone. This isoenzyme is inducible by 3-methylcholanthrene treatment and requires high UDPGA concentrations for elution from the UDP-hexanolamine affinity column in contrast to the other UDPGT isoenzymes. A second isoenzyme was purified and displayed a subunit molecular weight of 50,000. This isoenzyme was not induced by 3-methylcholanthrene and was active towards testosterone, the 17-OH position of beta-estradiol, p-nitrophenol, and 1-naphthol. A third isoenzyme was also purified and exhibited a subunit molecular weight of 52,000. This isoenzyme conjugated androsterone and etiocholanolone and was not induced by 3-methylcholanthrene treatment. This study reports the purification of two separate and distinct rat liver UDPGT isoenzymes capable of conjugating p-nitrophenol, only one of which is inducible by 3-methylcholanthrene treatment. Also, this is the first report of the purification of a UDPGT isoenzyme active towards the 3-OH position of androgens.

journal_name

Arch Biochem Biophys

journal_title

Archives of biochemistry and biophysics

authors

Falany CN,Tephly TR

doi

10.1016/0003-9861(83)90368-5

subject

Has Abstract

pub_date

1983-11-01 00:00:00

pages

248-58

issue

1

eissn

0003-9861

issn

1096-0384

pii

0003-9861(83)90368-5

journal_volume

227

pub_type

杂志文章

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