To assess directly whether CUG bound ribosomes required binding to the 5' cap, we carried out toeprint analysis in the presence of m7GTP cap analog which competes for binding to the cap binding protein, eIF4E.
The mutations on β5 may define the right-hand limit of VPg binding to the cap-binding pocket of pea eIF4E.
These α subunits are controlled by binding to "cap" structures or regulatory particles that recognize polyubiquitin tags attached to protein substrates and initiate the degradation process.
As a reference, Fab fragment binding to Sensor Chip CAP with capture reagent was studied.
Ultimately, cAMP, upon binding to CAP, activates the transcription of catabolic operons, allowing the bacteria to ferment carbohydrates such as maltose or lactose.
For instances, DDX3X has been reported to bind to the cap-binding protein complex (Shih et al, 2008).
The mRNA cap binds to the cap-binding protein (CBP) complex, which regulates mRNA transport from the cytoplasm to the nucleus.
This assay may also evaluate the sequential binding of eIF4E to the cap followed by 4E-BP1 binding to cap-associated eIF4E and indicate in agreement with the far western data in Figure 1C that de novo binding is blocked by Thr46 phosphorylation.
However, truncation of 837 residues, resulting in disruption of two intact WD repeats, completely abrogated binding to cap-sepharose.
eIF4E is an essential component in initiating cap-dependent translation via its binding to 5' 7-methyl-GTP cap structure on mRNAs, which stimulates formation of the cap-binding eIF4F complex through its interaction with the scaffolding protein eIF4G [ 49- 51].
