It was concluded that due to ability of interaction descriptors in prediction of binding mode, using this approach can be implemented in future 3D-QSAR softwares.
We were unable to detect any other strongly over-represented binding motifs in the Otx2-bound regions that lacked Oct4 binding, suggesting that this is the most common combinatorial binding mode used by Otx2.
Thus, EMS and SV-AUC techniques provide a complementary view of these complex interactions, which has allowed a thermodynamic dissection of these two IHF binding modes using model cos substrates.
They used the cocrystal structure from protein data bank (PDB code: 2CN8) [ 7], and then they identified new plausible binding modes used as template for 3D-QSAR [ 18].
Images were generated by aligning the Coh domain (gray) from PDB 2CCL (green, binding mode (A ) and 1OHZ (red, binding mode (B ) using the VMD plugin MultiSeq (Humphrey et al., 1996 ; Roberts et al., 2006 ).
TxIA(A10L) was therefore placed in the α7 binding pocket using the PnIA(A10L D14K) binding mode (Celie et al, 2005a).
The previously unknown binding mode was used as a basis for the design of a new ligand with similar affinity to others binding this pocket.
When a modified protein that cannot fully engage a ligand in the selected binding mode is used, ligands adopting such a binding mode are expected to stabilize the mutant protein against thermal unfolding to a lesser extent than the wild-type protein; ligands not engaging in the selected binding mode are expected to bind similarly to both mutant and wild-type protein.
This putative binding mode was used as a starting point for the rational design of inhibitors exploring two main areas in the binding site: the hydrophobic gatekeeper region and the lipophilic pocket leading to solvent (the region next to Gln 85 in Figure 4).
As a result of its effects on multiple signaling pathways, including nonkinase targets, and its probable ATP-competitive binding mode, the use of piceatannol (and likely analogs) as a biological probe likely offers no advantages over other more potent and moderately selective ATP-competitive probes.
