title: Ribotrap analysis of proteins associated with FHL3 3'untranslated region in glioma cells.
abstract: OBJECTIVE
  To screen the proteins associated with four-and-a-half LIM domains 3 (FHL3) 3' untranslated region (3'UTR) in glioma cells.
  
  
  METHODS
  Western blot was adopted to detect the regulatory effect of poly(C)-binding protein 2 (PCBP2) on FHL3. Biotin pull-down and sliver staining were employed to screen and verify the candidate binding proteins of FHL3 3'UTR. Then liquid chromatography-tandem mass spectrometry (LC-MS/MS) and molecule annotation system were used to identify and analyze the candidate binding proteins. Immuno- precipitation was conducted to study the interaction between PCBP2 and polypyrimidine tract-binding protein 1 (PTBP1), a binding protein identified by LC-MS/MS.
  
  
  RESULTS
  PCBP2 could bind to FHL3 mRNA 3'UTR-A and inhibited the expression of FHL3 in T98G glioms cells. 22 candidate binding proteins were identified. Among them, there were 11 RNA binding proteins, including PCBP2. PTBP1 associated with FHL3 mRNA 3'UTR and interacted with PCBP2 protein.
  
  
  CONCLUSIONS
  PCBP2 and PTBP1 can both associate with FHL3 mRNA 3'UTR through forming a protein complex.
authors.affiliation: State Key Laboratory of Medical Molecular Biology, Department of Biochemistry and Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100005, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Han
authors.affiliation: State Key Laboratory of Proteomics, Institute of Basic Medical Sciences, National Center of Biomedical Analysis, Beijing 100850, China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Xia
authors.forename: Bin
authors.initials: B
authors.lastname: Yin
authors.affiliation: State Key Laboratory of Medical Molecular Biology, Department of Biochemistry and Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100005, China.
authors.forename: Xiao-Zhong
authors.initials: XZ
authors.lastname: Peng
mesh_terms: D020413:3' Untranslated Regions; D001483:Base Sequence; D015153:Blotting, Western; D001932:Brain Neoplasms / Q000235:genetics / Q000378:metabolism*; D045744:Cell Line, Tumor; D002853:Chromatography, Liquid; D017931:DNA Primers; D005910:Glioma / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins / Q000378:metabolism*; D060588:LIM Domain Proteins / Q000378:metabolism*; D009363:Neoplasm Proteins / Q000378:metabolism*; D053719:Tandem Mass Spectrometry
chemical_list: D020413:3' Untranslated Regions; D017931:DNA Primers; C117563:FHL3 protein, human; D047908:Intracellular Signaling Peptides and Proteins; D060588:LIM Domain Proteins; D009363:Neoplasm Proteins