Identification of mouse YB1/p50 as a component of the FMRP-associated mRNP particle

Stephanie Ceman, Retecher Nelson, Stephen T. Warren

Research output: Contribution to journalArticlepeer-review


Fragile X mental retardation is caused by the absence of FMRP, an RNA-binding protein found in a large mRNP complex. Although there is evidence that FMRP exists as a homo-multimer, additional proteins have been identified that associate with FMRP in the mRNP. The autosomal paralogs of FMRP, FXR1P, and FXR2P, associate with FMRP, as do nucleolin and NUFIP1, all RNA binding proteins. Using cell lines that were stably transfected with Flag-Fmr1, we identiffed an additional protein that coimmunoprecipitares with FMRP. The approximately 50 kDa protein was identified by mass spectrometry as mouse Y box-binding protein 1 (YB1), which is 97% identical to the core mRNP protein p50, an RNA-binding protein. An anti-p50 antiserum recognized the 50 kDa protein, confirming the identification. The association of the FMRP-mRNP with a Y box protein, the latter commonly found in mRNPs, further suggests the involvement of FMRP in translation modulation.

Original languageEnglish (US)
Pages (from-to)904-908
Number of pages5
JournalBiochemical and Biophysical Research Communications
Issue number3
StatePublished - Dec 29 2000
Externally publishedYes


  • FMR1
  • FMRP
  • Fragile X syndrome
  • MRNP
  • YB1
  • p50

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology


Dive into the research topics of 'Identification of mouse YB1/p50 as a component of the FMRP-associated mRNP particle'. Together they form a unique fingerprint.

Cite this