Table 1.

Proteins regulated at the translational level by negative regulatory elements in the 5′-UTR of mRNA

Translational control mechanism Specific regulationReference
Stable stem-loop structures that interfere with initiation of translation  
 PDGF2  IRES  7, 8 
 TGF-β1   9  
 Ornithine decarboxylase   10, 11 
Stem-loop structures that may be stabilized by mRNA-binding proteins  
 Ferritin (H- and L-subunit)  IRPs  12, 13 
 Transferrin receptor  IRPs  
 Erythroid-specific δ-aminolevulinate synthase (ALAS2)  IRPs  
 DMT1 (or Nramp 2) IRPs  14  
 IGF-II  IMPs and IRES  15, 16  
 APP  17  
uORFs that repress translation  
 TPO   18 
 IL-7   19  
 IL-15   20, 21  
 TGF-β3  22, 23  
 VEGF  IRES  24  
 Bcl-2  25  
 p18(INK4c)  26  
uORF-encoded peptides that inhibit translation 
 S-adenosylmethionine decarboxylase   27 
 β2-adrenergic receptor   28, 29  
Alternative in frame initiation codons  
 C/EBPα   30 
 C/EBPβ (LIP and LAP)   31  
 int-2  32  
 bFGF  IRES  33, 34, 35 
 c-myc  IRES  36, 37, 38 
 pim-1   39  
 BAG-1  40, 41 
Translational control mechanism Specific regulationReference
Stable stem-loop structures that interfere with initiation of translation  
 PDGF2  IRES  7, 8 
 TGF-β1   9  
 Ornithine decarboxylase   10, 11 
Stem-loop structures that may be stabilized by mRNA-binding proteins  
 Ferritin (H- and L-subunit)  IRPs  12, 13 
 Transferrin receptor  IRPs  
 Erythroid-specific δ-aminolevulinate synthase (ALAS2)  IRPs  
 DMT1 (or Nramp 2) IRPs  14  
 IGF-II  IMPs and IRES  15, 16  
 APP  17  
uORFs that repress translation  
 TPO   18 
 IL-7   19  
 IL-15   20, 21  
 TGF-β3  22, 23  
 VEGF  IRES  24  
 Bcl-2  25  
 p18(INK4c)  26  
uORF-encoded peptides that inhibit translation 
 S-adenosylmethionine decarboxylase   27 
 β2-adrenergic receptor   28, 29  
Alternative in frame initiation codons  
 C/EBPα   30 
 C/EBPβ (LIP and LAP)   31  
 int-2  32  
 bFGF  IRES  33, 34, 35 
 c-myc  IRES  36, 37, 38 
 pim-1   39  
 BAG-1  40, 41 

UTR indicates untranslated region; mRNA, messenger RNA; PDGF, platelet-derived growth factor; TGF, transforming growth factor; ALAS2, δ-aminolevulinate synthase; DMT, dimethyltryptamine; IGF, insulinlike growth factor; APP, amyloid precursor protein; uORF, upstream open reading frame; TPO, thrombopoietin; IL, interleukin; VEGF, vascular endothelial growth factor; bFGF, basic fibroblast growth factor; LIP, liver inhibitory protein; LAP, liver activator protein; IRES, internal ribosomal entry site; IRPs, iron regulatory proteins; IMPs, IGF II mRNA binding proteins.

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