hnRNP G: sequence and characterization of a glycosylated RNA-binding protein

Authors:
  • VVVeèronique Della Valle
    Veèronique Della Valle
  • MSMikkiko C. Siomi
    Mikkiko C. Siomi
  • SPSerafin Pin`oL-Roma
    Serafin Pin`oL-Roma
  • PCPatrice Codogno
    Patrice Codogno
  • CBChantal Bauvy
    Chantal Bauvy
  • MBMichel Bellini
    Michel Bellini
  • JLJean-Claude Lacroix
    Jean-Claude Lacroix
  • GMGuillaume Monod
    Guillaume Monod
  • GDGidden Dreyfuss
    Gidden Dreyfuss
  • CLChristian-Jacques Larsen
    Christian-Jacques Larsen

Abstract
The autoantigen p43 is a nuclear protein initially identified with autoantibodies from dogs with a lupus-like syndrome. Here we show that p43 is an RNA-binding protein, and identify it as hnRNP G, a previously described component of heterogeneous nuclear ribonucleoprotein complexes. We demonstrate that p43/hnRNP G is glycosylated, and identify the modification as O-linked N-acetylglucosamine. A full-length cDNA clone for hnRNP G has been isolated and sequenced, and the predicted amino acid sequence for hnRNP G shows that it contains one RNP-consensus RNA binding domain (RBD) at the amino terminus and a carboxyl domain rich in serines, arginines and glycines. The RBD of human hnRNP G shows striking similarities with the RBDs of several plant RNA-binding proteins.

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