Polypyrimidine tract binding protein 2 stabilizes phosphoglycerate kinase 2 mRNA in murine male germ cells by binding to its 3'UTR.
The mRNA that encodes the testis-specific protein phosphoglycerate kinase (PGK2) is a long-lived mRNA that is transcribed in meiotic and postmeiotic male germ cells. Pgk2 mRNA is present in germ cells for up to 2 wk before its protein product is detected. Using affinity chromatography with the 3'-UTR of the Pgk2 mRNA, several proteins, including the RNA-binding protein, polypyrimidine tract binding protein 2 (PTBP2), were identified in mouse testis extracts. Coimmunoprecipitation experiments confirmed that PTBP2 binds to Pgk2 mRNA in the testis and RNA gel shifts demonstrated that PTBP2, but not PTBP1, binds to a specific region of the Pgk2 3'-UTR. Recombinant PTBP2 increased the stability of reporter constructs that contained the 3'-UTR Pgk2 sequence element in both testis extracts and transfected HeLa cells. We propose that PTBP2 is a trans-acting factor that helps to stabilize Pgk2 mRNA in male mouse germ cells.
Xu
Mingang
M
Center for Research on Reproduction and Women's Health, University of Pennsylvania School of Medicine, 421 Curie Boulevard, Philadelphia, PA 19104-6080, USA.
Hecht
Norman B
NB
D000818:Animals; D020869:Gene Expression Profiling; D005854:Germ Cells / Q000378:metabolism; D006367:HeLa Cells; D006801:Humans; D007527:Isoenzymes / Q000378:metabolism / Q000502:physiology*; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D009419:Nerve Tissue Proteins / Q000235:genetics / Q000378:metabolism*; D010735:Phosphoglycerate Kinase / Q000378:metabolism / Q000502:physiology*; D038941:Polypyrimidine Tract-Binding Protein / Q000235:genetics / Q000378:metabolism*; D011485:Protein Binding; D020871:RNA Stability / Q000502:physiology*; D012333:RNA, Messenger / Q000378:metabolism; D016601:RNA-Binding Proteins / Q000378:metabolism; D050436:Regulatory Elements, Transcriptional; D013094:Spermatozoa / Q000378:metabolism*; D013737:Testis / Q000737:chemistry / Q000378:metabolism; D014162:Transfection
D007527:Isoenzymes; D009419:Nerve Tissue Proteins; C429773:Ptbp2 protein, mouse; D012333:RNA, Messenger; D016601:RNA-Binding Proteins; D038941:Polypyrimidine Tract-Binding Protein; D010735:Phosphoglycerate Kinase; C104317:phosphoglycerate kinase, testis specific