RNA-binding factor that may recruit target transcripts to cytoplasmic protein-RNA complexes (mRNPs). This transcript 'caging' into mRNPs allows mRNA transport and transient storage. It also modulates the rate and location at which target transcripts encounter the translational apparatus and shields them from endonuclease attacks or microRNA-mediated degradation. Binds to the 3'-UTR of CD44 mRNA and stabilizes it, hence promotes cell adhesion and invadopodia formation in cancer cells. Binds to beta-actin/ACTB and MYC transcripts. Binds to the 5'-UTR of the insulin-like growth factor 2 (IGF2) mRNAs.
Background References
1. Vikesaa J et al. RNA-binding IMPs promote cell adhesion and invadopodia formation. EMBO J. 25:1456-1468(2006).
2. Wachter K et al. Subcellular localization and RNP formation of IGF2BPs (IGF2 mRNA-binding proteins) is modulated by distinct RNA-binding domains. Biol Chem 394:1077-1090(2013).
Sequence Similarity
Belongs to the RRM IMP/VICKZ family.
Tissue Specificity
Expressed in fetal liver, fetal lung, fetal kidney, fetal thymus, fetal placenta, fetal follicles of ovary and gonocytes of testis, growing oocytes, spermatogonia and semen (at protein level). Expressed in cervix adenocarcinoma, in testicular, pancreatic and renal-cell carcinomas (at protein level). Expressed ubiquitously during fetal development at 8 and 14 weeks of gestation. Expressed in ovary, testis, brain, placenta, pancreatic cancer tissues and pancreatic cancer cell lines.
Western blot analysis of IMP3 on different lysates with Mouse anti-IMP3 antibody (EM1801-01) at 1/2,000 dilution.
Lane 1: HeLa cell lysate (20 µg/Lane) Lane 2: MDA-MB-231 cell lysate (20 µg/Lane) Lane 3: 293T cell lysate (20 µg/Lane) Lane 4: Mouse spleen tissue lysate (40 µg/Lane) Lane 5: Mouse placenta tissue lysate (40 µg/Lane) Lane 6: Rat spleen tissue lysate (40 µg/Lane) Lane 7: Rat placenta tissue lysate (40 µg/Lane)
Predicted band size: 64 kDa Observed band size: 64 kDa
Exposure time: Lane 1-4: 20 seconds; Lane 5-6: 46 seconds; ECL: K1801;
4-20% SDS-PAGE gel.
Proteins were transferred to a PVDF membrane and blocked with 5% NFDM/TBST for 1 hour at room temperature. The primary antibody (EM1801-01) at 1/2,000 dilution was used in 5% NFDM/TBST at 4℃ overnight. Goat Anti-Mouse IgG - HRP Secondary Antibody (HA1006) at 1/50,000 dilution was used for 1 hour at room temperature.
☑ Knockdown (KD)
Western blot analysis of IMP3 on different lysates with Mouse anti-IMP3 antibody (EM1801-01) at 1/5,000 dilution.
Lane 1: HAP1-parental cell lysate Lane 2: HAP1-IMP3 KD cell lysate
Lysates/proteins at 10 µg/Lane.
Predicted band size: 64 kDa Observed band size: 64 kDa
Exposure time: 12 seconds; ECL: K1801;
4-20% SDS-PAGE gel.
Proteins were transferred to a PVDF membrane and blocked with 5% NFDM/TBST for 1 hour at room temperature. The primary antibody (EM1801-01) at 1/5,000 dilution was used in primary antibody dilution (K1803) at 4℃ overnight. Goat Anti-Mouse IgG - HRP Secondary Antibody (HA1006) at 1/50,000 dilution was used for 1 hour at room temperature.
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