Re: [ccp4bb] offtopic: effect of compound impurities on ITC?

2010-08-26 Thread Justin Hall
Hi Francis, I might save you some time by telling you up front you should just go back and purify your compound to remove the impurity, you dont even need to read the rest of this, just go. Along the lines of what Savvas was saying, with any equilibrium binding assay between two direct co

Re: [ccp4bb] offtopic: effect of compound impurities on ITC?

2010-08-25 Thread Savvas Savvides
Hi Francis I guess it depends on how much residual high-affinity binder you have in the mixture and what the difference in affinity is between Y and deriv-Y. Another issue is of course whether Y and derY compete for the same binding site and have the same stoichiometry. A well designed displacem

Re: [ccp4bb] offtopic: effect of compound impurities on ITC?

2010-08-24 Thread Ahmed Rohaim
Hi,   If your are talking about proteins or protein subunits, this means that you are making polymers of nY, and Y becames the monomer. So in this case, I will not consider Y as an impurity.   If I get you right, then size exclusion chromtography is good option to separate the monomers from the