Functional analysis of the fission yeast Prp4 protein kinase involved in pre-mRNA splicing and isolation of a putative mammalian homologue

Nucleic Acids Res. 1997 Mar 1;25(5):1028-35. doi: 10.1093/nar/25.5.1028.

Abstract

The prp4 gene of Schizosaccharomyces pombe encodes a protein kinase. A physiological substrate is not yet known. A mutational analysis of prp4 revealed that the protein consists of a short N-terminal domain, containing several essential motifs, which is followed by the kinase catalytic domain comprising the C-terminus of the protein. Overexpression of N-terminal mutations disturbs mitosis and produces elongated cells, Using a PCR approach, we isolated a putative homologue of Prp4 from human and mouse cells. The mammalian kinase domain is 53% identical to the kinase domain of Prp4. The short N-terminal domains share <20% identical amino acids, but contain conserved motifs. A fusion protein consisting of the N-terminal region from S. pombe followed by the mammalian kinase domain complements a temperature-sensitive prp4 mutation of S. pombe. Prp4 and the recombinant yeast/mouse protein kinase phosphorylate the human SR splicing factor ASF/SF2 in vitro in its RS domain.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Binding Sites
  • DNA Primers
  • DNA, Complementary
  • Genetic Complementation Test
  • HeLa Cells
  • Humans
  • Mammals
  • Mice
  • Mitosis
  • Molecular Sequence Data
  • Mutagenesis, Site-Directed
  • Nuclear Proteins / metabolism
  • Protein Serine-Threonine Kinases / genetics
  • Protein Serine-Threonine Kinases / metabolism*
  • RNA Precursors / metabolism*
  • RNA Splicing Factors
  • RNA Splicing*
  • RNA-Binding Proteins
  • Rabbits
  • Recombinant Fusion Proteins / genetics
  • Recombinant Fusion Proteins / metabolism
  • Ribonucleoprotein, U4-U6 Small Nuclear / genetics
  • Ribonucleoprotein, U4-U6 Small Nuclear / metabolism
  • Schizosaccharomyces / enzymology*
  • Schizosaccharomyces / genetics
  • Schizosaccharomyces pombe Proteins*
  • Sequence Homology, Amino Acid
  • Serine-Arginine Splicing Factors

Substances

  • DNA Primers
  • DNA, Complementary
  • Nuclear Proteins
  • RNA Precursors
  • RNA Splicing Factors
  • RNA-Binding Proteins
  • Recombinant Fusion Proteins
  • Ribonucleoprotein, U4-U6 Small Nuclear
  • Schizosaccharomyces pombe Proteins
  • Serine-Arginine Splicing Factors
  • PRPF4B protein, human
  • Protein Serine-Threonine Kinases
  • Prpf4b protein, mouse
  • prp4 protein, S pombe