Our results also predict IC50 dependence on the rates of drug and ligand association and dissociation, even for constant affinities.
Given that differences in ligand affinity do not fully explain predicted IC50 differences, we performed an analysis assuming constant affinities of ligand (based on EGF) and drug (gefitinib or cetuximab) but varying rate constants for ligand and drug binding and unbinding by an equal "cycling factor".
> -wrap-foot> The association (ka) and dissociation (kd) rate constants and affinity constant (KD) have been measured for MA1 Fab fragment against rBet v 1.
Using the measured rate constants, the affinity constants (KD) for both RNA pairs were calculated to be 2.5 nM and 0.56 nM for the A6U and ND7-550 pairespectivelyvely.
Wherever possible, the Langmuir model was employed for isotherms linearization and determination of adsorption constants such as affinity constant (K, in M-1) and maximal adsorption (in number of molecules per m2 silica) [ 49].
The increase in photounbinding with decreasing dissociation constant (increasing affinity), may be influenced by the unique conformational states that CaM adopts when complexed with these different peptides [20].
Based on the measured inhibition constants, the affinity for the disaccharide was ∼1000-fold ∼1000-foldn for any of thigherosaccharides thaned.
In addition, it is possible to estimate the constants (binding affinity and hill coefficient) of one of the 13 reactions in the system.
Association rate (ka), dissociation rate (kd), affinity constant (KA), and dissociation constant (KD) were obtained from fitted curves.
Protein interactions are quantified by binding kinetic constants and affinities, and determining these parameters is thus a basic task in studying and quantifying protein interactions.
The final mean affinity constant represents the mean value (+/−SEM) of 4 different calculations: 3 calculated affinity constants at antigen coating ratio of 2; 1 calculated affinity constants at antigen coating ratio of 8.
