Cell-free translation of mouse liver mRNA coding for two forms of UDP glucuronosyltransferase

Peter I. Mackenzie, Frank J. Gonzalez, Ida S. Owens

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Mouse liver poly(A) RNA, when translated in vitro, produced two forms of UDP glucuronosyltransferase with molecular weights of approximately 50,000 and 54,000 (designated GTm1 and GTm2, respectively). These forms were identified by antibody prepared against GTm1. The mRNA coding for GTm1 was preferentially increased twofold after treatment of mice with 3-methylcholanthrene, while GTm2 mRNA was unaffected. Phenobarbital, however, increased the translatable levels of the mRNAs coding for both proteins approximately twofold. GTm1 was shown to be glycosylated during translation in the presence of dog pancreatic microsomes. This was reflected by a decrease in mobility of the protein in sodium dodecyl sulfate-polyacrylamide gels as compared to GTm1 translated in the absence of microsomes. Further evidence for glycosylation in vivo was demonstrated by an increase in the mobility of GTm1 immunoadsorbed from microsomes treated with endoglycosidase H. In contrast, GTm2 was unmodified. This apparent difference in the state of glycosylation may reflect a difference in the transmembrane distribution of these two enzyme forms, and hence play an important role in determining the type of aglycone glucuronidated and its route of removal from the cell.

Original languageEnglish
Pages (from-to)676-680
Number of pages5
JournalArchives of Biochemistry and Biophysics
Volume230
Issue number2
DOIs
Publication statusPublished - 1 May 1984
Externally publishedYes

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