Identification of hnRNPs K, L and A2/B1 as candidate proteins involved in the nutritional regulation of mRNA splicing

Brian N. Griffith, Callee M. Walsh, Wioletta Szeszel-Fedorowicz, Aaron T. Timperman, Lisa M. Salati

Research output: Contribution to journalArticlepeer-review

Abstract

Nutrient regulation of glucose-6-phosphate dehydrogenase (G6PD) expression occurs through changes in the rate of splicing of G6PD pre-mRNA. This posttranscriptional mechanism accounts for the 12- to 15-fold increase in G6PD expression in livers of mice that were starved and then refed a high-carbohydrate diet. Regulation of G6PD pre-mRNA splicing requires a cis-acting element in exon 12 of the pre-mRNA. Using RNA probes to exon 12 and nuclear extracts from livers of mice that were starved or refed, proteins of 60 kDa and 37 kDa were detected bound to nucleotides 65-79 of exon 12 and this binding was decreased by 50% with nuclear extracts from refed mice. The proteins were identified as hnRNPs K, L, and A2/B1 by LC-MS/MS. The decrease in binding of these proteins to exon 12 during refeeding was not accompanied by a decrease in the total amount of these proteins in total nuclear extract. HnRNPs K, L and A2/B1 have known roles in the regulation of mRNA splicing. The decrease in binding of these proteins during treatments that increase G6PD expression is consistent with a role for these proteins in the inhibition of G6PD mRNA splicing.

Original languageEnglish (US)
Pages (from-to)552-561
Number of pages10
JournalBiochimica et Biophysica Acta - Gene Structure and Expression
Volume1759
Issue number11-12
DOIs
StatePublished - Nov 2006
Externally publishedYes

Keywords

  • RNA splicing
  • hnRNP
  • lipogenesis
  • liver
  • nutritional regulation
  • posttranscriptional gene regulation

ASJC Scopus subject areas

  • Structural Biology
  • Biophysics
  • Biochemistry
  • Genetics

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