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LIN28A Acts as a 'translational enhancer', driving specific mRNAs to polysomes and thus increasing the efficiency of protein synthesis. Its association with the translational machinery and target mRNAs results in an increased number of initiation events per molecule of mRNA and, indirectly, in stabilizing the mRNAs. Binds IGF2 mRNA, MYOD1 mRNA, ARBP/36B4 ribosomal protein mRNA and its own mRNA. Essential for skeletal muscle differentiation program through the translational up-regulation of IGF2 expression. Acts as a suppressor of microRNA (miRNA) biogenesis by specifically binding the precursor let-7 (pre-let- 7), a miRNA precursor. Acts by binding pre-let-7 and recruiting ZCCHC11/TUT4 uridylyltransferase, leading to the terminal uridylation of pre-let-7. Uridylated pre-let-7 miRNAs fail to be processed by Dicer and undergo degradation. Degradation of pre- let-7 in embryonic stem (ES) cells contributes to the maintenance of ES cells. In contrast, LIN28A down-regulation in neural stem cells by miR-125, allows the processing of pre-let-7. Specifically recognizes the 5'-GGAG-3' motif in the terminal loop of pre-let-7. Also recognizes and binds non pre-let-7 pre-miRNAs that contain the 5'-GGAG-3' motif in the terminal loop, leading to their terminal uridylation and subsequent degradation. Monomer. During skeletal muscle differentiation, associated with translation initiation complexes in the polysomal compartment. Directly interacts with EIF3S2. Interaction with NCL is RNA-dependent. Interacts with ZCCHC11/TUT4. Can be negatively regulated by the interaction of microRNAs miR-125a and miR-125b with at least two miRNA responsive elements (miREs) in the 3'-UTR of this gene. These interactions may reduce both translation efficiency and mRNA abundance. Negatively regulated by retinoic acid. Expressed in embryonic stem cells (ES cells), placenta and testis. Belongs to the lin-28 family. Note: This description may include information from UniProtKB.
Protein type: Nucleolus; RNA-binding; Translation
Chromosomal Location of Human Ortholog: 1p36.11
Cellular Component: cytoplasm; cytosol; nucleus; rough endoplasmic reticulum; stress granule
Molecular Function: miRNA binding; protein binding; RNA binding
Biological Process: negative regulation of translation; positive regulation of protein kinase B signaling cascade; positive regulation of TOR signaling pathway; pre-microRNA processing; RNA 3'-end processing; somatic stem cell maintenance; stem cell maintenance
Reference #:  Q9H9Z2 (UniProtKB)
Alt. Names/Synonyms: CSDD1; FLJ12457; LIN-28; lin-28 homolog A (C. elegans); Lin-28A; LIN28; LIN28A; LN28A; Protein lin-28 homolog A; RNA-binding protein LIN-28; ZCCHC1; Zinc finger CCHC domain-containing protein 1; zinc finger, CCHC domain containing 1
Gene Symbols: LIN28A
Molecular weight: 22,743 Da
Basal Isoelectric point: 8.35  Predict pI for various phosphorylation states
Protein-Specific Antibodies or siRNAs from Cell Signaling Technology® Total Proteins
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