Translation initiation on mRNAs bound by nuclear cap-binding protein complex CBP80/20 requires interaction between CBP80/20-dependent translation initiation factor and eukaryotic translation initiation factor 3g. 2012

Junho Choe, and Nara Oh, and Sungjin Park, and Ye Kyung Lee, and Ok-Kyu Song, and Nicolas Locker, and Sung-Gil Chi, and Yoon Ki Kim
School of Life Sciences and Biotechnology, Korea University, Seoul, Republic of Korea.

In the cytoplasm of mammalian cells, either cap-binding proteins 80 and 20 (CBP80/20) or eukaryotic translation initiation factor (eIF) 4E can direct the initiation of translation. Although the recruitment of ribosomes to mRNAs during eIF4E-dependent translation (ET) is well characterized, the molecular mechanism for CBP80/20-dependent translation (CT) remains obscure. Here, we show that CBP80/20-dependent translation initiation factor (CTIF), which has been shown to be preferentially involved in CT but not ET, specifically interacts with eIF3g, a component of the eIF3 complex involved in ribosome recruitment. By interacting with eIF3g, CTIF serves as an adaptor protein to bridge the CBP80/20 and the eIF3 complex, leading to efficient ribosome recruitment during CT. Accordingly, down-regulation of CTIF using a small interfering RNA causes a redistribution of CBP80 from polysome fractions to subpolysome fractions, without significant consequence to eIF4E distribution. In addition, down-regulation of eIF3g inhibits the efficiency of nonsense-mediated mRNA decay, which is tightly coupled to CT but not to ET. Moreover, the artificial tethering of CTIF to an intercistronic region of dicistronic mRNA results in translation of the downstream cistron in an eIF3-dependent manner. These findings support the idea that CT mechanistically differs from ET.

UI MeSH Term Description Entries
D011485 Protein Binding The process in which substances, either endogenous or exogenous, bind to proteins, peptides, enzymes, protein precursors, or allied compounds. Specific protein-binding measures are often used as assays in diagnostic assessments. Plasma Protein Binding Capacity,Binding, Protein
D002460 Cell Line Established cell cultures that have the potential to propagate indefinitely. Cell Lines,Line, Cell,Lines, Cell
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D001483 Base Sequence The sequence of PURINES and PYRIMIDINES in nucleic acids and polynucleotides. It is also called nucleotide sequence. DNA Sequence,Nucleotide Sequence,RNA Sequence,DNA Sequences,Base Sequences,Nucleotide Sequences,RNA Sequences,Sequence, Base,Sequence, DNA,Sequence, Nucleotide,Sequence, RNA,Sequences, Base,Sequences, DNA,Sequences, Nucleotide,Sequences, RNA
D012333 RNA, Messenger RNA sequences that serve as templates for protein synthesis. Bacterial mRNAs are generally primary transcripts in that they do not require post-transcriptional processing. Eukaryotic mRNA is synthesized in the nucleus and must be exported to the cytoplasm for translation. Most eukaryotic mRNAs have a sequence of polyadenylic acid at the 3' end, referred to as the poly(A) tail. The function of this tail is not known for certain, but it may play a role in the export of mature mRNA from the nucleus as well as in helping stabilize some mRNA molecules by retarding their degradation in the cytoplasm. Messenger RNA,Messenger RNA, Polyadenylated,Poly(A) Tail,Poly(A)+ RNA,Poly(A)+ mRNA,RNA, Messenger, Polyadenylated,RNA, Polyadenylated,mRNA,mRNA, Non-Polyadenylated,mRNA, Polyadenylated,Non-Polyadenylated mRNA,Poly(A) RNA,Polyadenylated mRNA,Non Polyadenylated mRNA,Polyadenylated Messenger RNA,Polyadenylated RNA,RNA, Polyadenylated Messenger,mRNA, Non Polyadenylated
D014176 Protein Biosynthesis The biosynthesis of PEPTIDES and PROTEINS on RIBOSOMES, directed by MESSENGER RNA, via TRANSFER RNA that is charged with standard proteinogenic AMINO ACIDS. Genetic Translation,Peptide Biosynthesis, Ribosomal,Protein Translation,Translation, Genetic,Protein Biosynthesis, Ribosomal,Protein Synthesis, Ribosomal,Ribosomal Peptide Biosynthesis,mRNA Translation,Biosynthesis, Protein,Biosynthesis, Ribosomal Peptide,Biosynthesis, Ribosomal Protein,Genetic Translations,Ribosomal Protein Biosynthesis,Ribosomal Protein Synthesis,Synthesis, Ribosomal Protein,Translation, Protein,Translation, mRNA,mRNA Translations
D017931 DNA Primers Short sequences (generally about 10 base pairs) of DNA that are complementary to sequences of messenger RNA and allow reverse transcriptases to start copying the adjacent sequences of mRNA. Primers are used extensively in genetic and molecular biology techniques. DNA Primer,Oligodeoxyribonucleotide Primer,Oligodeoxyribonucleotide Primers,Oligonucleotide Primer,Oligonucleotide Primers,Primer, DNA,Primer, Oligodeoxyribonucleotide,Primer, Oligonucleotide,Primers, DNA,Primers, Oligodeoxyribonucleotide,Primers, Oligonucleotide
D020133 Reverse Transcriptase Polymerase Chain Reaction A variation of the PCR technique in which cDNA is made from RNA via reverse transcription. The resultant cDNA is then amplified using standard PCR protocols. Polymerase Chain Reaction, Reverse Transcriptase,Reverse Transcriptase PCR,PCR, Reverse Transcriptase,Transcriptase PCR, Reverse
D020798 Two-Hybrid System Techniques Screening techniques first developed in yeast to identify genes encoding interacting proteins. Variations are used to evaluate interplay between proteins and other molecules. Two-hybrid techniques refer to analysis for protein-protein interactions, one-hybrid for DNA-protein interactions, three-hybrid interactions for RNA-protein interactions or ligand-based interactions. Reverse n-hybrid techniques refer to analysis for mutations or other small molecules that dissociate known interactions. One-Hybrid System Techniques,Reverse One-Hybrid System Techniques,Reverse Two-Hybrid System Techniques,Three-Hybrid System Techniques,Yeast Two-Hybrid Assay,Yeast Two-Hybrid System Techniques,One-Hybrid System Technics,Reverse Three-Hybrid System Techniques,Three-Hybrid System Technics,Tri-Hybrid System Techniques,Two-Hybrid Assay,Two-Hybrid Method,Two-Hybrid System Technics,Yeast One-Hybrid System Techniques,Yeast Three-Hybrid Assay,Yeast Three-Hybrid System,Yeast Three-Hybrid System Techniques,Yeast Two-Hybrid System,n-Hybrid System Techniques,Assay, Two-Hybrid,Assay, Yeast Three-Hybrid,Assay, Yeast Two-Hybrid,Assays, Two-Hybrid,Assays, Yeast Three-Hybrid,Assays, Yeast Two-Hybrid,Method, Two-Hybrid,Methods, Two-Hybrid,One Hybrid System Technics,One Hybrid System Techniques,One-Hybrid System Technic,One-Hybrid System Technique,Reverse One Hybrid System Techniques,Reverse Three Hybrid System Techniques,Reverse Two Hybrid System Techniques,System Technique, n-Hybrid,System Techniques, n-Hybrid,System, Yeast Three-Hybrid,System, Yeast Two-Hybrid,Systems, Yeast Three-Hybrid,Systems, Yeast Two-Hybrid,Technic, One-Hybrid System,Technic, Three-Hybrid System,Technic, Two-Hybrid System,Technics, One-Hybrid System,Technics, Three-Hybrid System,Technics, Two-Hybrid System,Technique, One-Hybrid System,Technique, Three-Hybrid System,Technique, Tri-Hybrid System,Technique, Two-Hybrid System,Technique, n-Hybrid System,Techniques, One-Hybrid System,Techniques, Three-Hybrid System,Techniques, Tri-Hybrid System,Techniques, Two-Hybrid System,Techniques, n-Hybrid System,Three Hybrid System Technics,Three Hybrid System Techniques,Three-Hybrid Assay, Yeast,Three-Hybrid Assays, Yeast,Three-Hybrid System Technic,Three-Hybrid System Technique,Three-Hybrid System, Yeast,Three-Hybrid Systems, Yeast,Tri Hybrid System Techniques,Tri-Hybrid System Technique,Two Hybrid Assay,Two Hybrid Method,Two Hybrid System Technics,Two Hybrid System Techniques,Two-Hybrid Assay, Yeast,Two-Hybrid Assays,Two-Hybrid Assays, Yeast,Two-Hybrid Methods,Two-Hybrid System Technic,Two-Hybrid System Technique,Two-Hybrid System, Yeast,Two-Hybrid Systems, Yeast,Yeast One Hybrid System Techniques,Yeast Three Hybrid Assay,Yeast Three Hybrid System,Yeast Three Hybrid System Techniques,Yeast Three-Hybrid Assays,Yeast Three-Hybrid Systems,Yeast Two Hybrid Assay,Yeast Two Hybrid System,Yeast Two Hybrid System Techniques,Yeast Two-Hybrid Assays,Yeast Two-Hybrid Systems,n Hybrid System Techniques,n-Hybrid System Technique
D026481 Blotting, Far-Western A method that is derived from western blotting (BLOTTING, WESTERN) and is used to detect protein-protein interactions. The blotted proteins are probed with a non-antibody protein which can then be tagged with a labeled antibody. Blotting, West-Western,Far-Western Blotting,Blot, Far-Western,Blot, West-Western,Far-Western Blot,West-Western Blot,Blot, Far Western,Blot, West Western,Blots, Far-Western,Blots, West-Western,Blotting, Far Western,Blotting, West Western,Blottings, Far-Western,Blottings, West-Western,Far Western Blot,Far Western Blotting,Far-Western Blots,Far-Western Blottings,West Western Blot,West-Western Blots,West-Western Blotting,West-Western Blottings

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