Residue 222 (225 in H3 numbering), has garnered attention because it plays a role in conferring specificity to α2 6 sialylated glycans present in the human upper airway, and may modulate binding to the human lower respiratory tract pneumocytes expressing α2 3 sialylated glycans [14].
In animals, the binding to the 3′UTR lowers mRNA levels by preferentially decreasing the stability of the mRNA, thus increasing its degradation, or by repressing translation.
Indeed, the recombinant A/H1N1/2009 HA has been characterized to exhibit lower binding to the alveolar tissue of the lower respiratory tract [17].
The levels of DARPin binding to the cells was lower in the lymph nodes than in the peripheral blood after 30 minutes, but was at similar levels after 6 and 24 hours (Figure 4D).
In fact, erythromycin can completely abolish SB binding to the ribosome, illustrating the lower affinity of the SB.
Then the top gate area gradually increased and finally recovered close to the initial size in a synchronized manner with the location shift of bound K+ ion from the upper binding site to the lower binding site (Fig. 3E and 3F).
Addition of recombinant ATF4 to C/EBPβ increased binding to the ATF4 motif at the lower protein concentrations, indicating that ATF4 and C/EBPβ readily form heterodimers in solution as shown previously for other bZip proteins (Cao et al., 1991), and revealing that the heterodimer recognizes this sequence with higher affinity than the C/EBPβ homodimer.
The analogs exhibited high-affinity binding to the GluK1 (GluR5) subunit and lower affinity binding to GluK2 (GluR6) and GluK3 (GluR7) subunits in radioligand displacement assays with recombinant kainate and AMPA receptors.
Although both subunits have high affinity for the inhibitor relative to enzyme and inhibitor concentrations in the titration, binding to the second site has lower affinity than to the first.
HFE and transferrin directly compete for binding to the transferrin receptor, thereby lowering its affinity for iron-containing transferrin and down-regulating uptake of iron by cells [19].
