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Reviewer #1: The Biacore Data presented in the publication is everything but convincing for several reasons: 1.) The authors state that association and dissociation constants were calculated by using the Biacore evaluation version 4.1 software. What is missing, is the information which models have been used for the fits that are necessary to derive the kinetic data. 2.) Looking at the sensogramms CWPa in Figure 5 A. It seems that the curves for 0.36 µM and 0.71 µM as well as 1.79 µM and 1.43 µM overlap in the dissociation phase, even though different capture levels were reached (at least before correction of RI, which is not shown). How did the software deal with this? 3.) In Figure 5C two sensograms are shown at 0.36 µM here we clearly see a slower Offrate Koff for the CWP2 than for CWPa, in the Table 3 the authors claim that Koff for CWPa is 6 times slower (1,3E-3) that the Koff for CWP2 (7,34E-3). Looking at this, together with the missing fits, the large RI in all the curves the numbers presented in the table are not very convincing. 4.) The high signals of >2000 RU indicate that the target epitope is very abundant in the CWP preparation, for a monovalent scenario, even if the size of the protein is 5 kDa only >20% of the CWP preparation should be the target protein. This seems a lot. It would be nice if the authors would comment on this in the context of what is known about the target protein. Therefore, the authors should provide some more insight into the generation of the kinetic data presented in Table 3 since these Kinetic measurements are the basis for the claim that a >10 fold increase of affinity was achieved.
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[ Last edited by wg423 on 2011-12-25 at 19:38 ] |