A yeast heterogeneous nuclear ribonucleoprotein complex associated with RNA polymerase II.

Academic Article

Abstract

  • Recent evidence suggests a role for the carboxyl-terminal domain (CTD) of the largest subunit of RNA polymerase II (pol II) in pre-mRNA processing. The yeast NRD1 gene encodes an essential RNA-binding protein that shares homology with mammalian CTD-binding proteins and is thought to regulate mRNA abundance by binding to a specific cis-acting element. The present work demonstrates genetic and physical interactions among Nrd1p, the pol II CTD, Nab3p, and the CTD kinase CTDK-I. Previous studies have shown that Nrd1p associates with the CTD of pol II in yeast two-hybrid assays via its CTD-interaction domain (CID). We show that nrd1 temperature-sensitive alleles are synthetically lethal with truncation of the CTD to 9 or 10 repeats. Nab3p, a yeast hnRNP, is a high-copy suppressor of some nrd1 temperature-sensitive alleles, interacts with Nrd1p in a yeast two-hybrid assay, and coimmunoprecipitates with Nrd1p. Temperature-sensitive alleles of NAB3 are suppressed by deletion of CTK1, a kinase that has been shown to phosphorylate the CTD and increase elongation efficiency in vitro. This set of genetic and physical interactions suggests a role for yeast RNA-binding proteins in transcriptional regulation.
  • Keywords

  • Alleles, Base Sequence, DNA Primers, Fungal Proteins, Genes, Suppressor, Heterogeneous-Nuclear Ribonucleoproteins, Phosphorylation, Precipitin Tests, Protein Binding, RNA Polymerase II, RNA Precursors, RNA Processing, Post-Transcriptional, RNA, Messenger, RNA-Binding Proteins, Ribonucleoproteins, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins, Temperature, Transcription, Genetic
  • Author List

  • Conrad NK; Wilson SM; Steinmetz EJ; Patturajan M; Brow DA; Swanson MS; Corden JL
  • Start Page

  • 557
  • End Page

  • 571
  • Volume

  • 154
  • Issue

  • 2