Results from analysis of NMR relaxation data obtained at 950, 500 and 600([52]) using various models of motions with the Model-Free analysis.

The different parameter and model of motions are described in the text. The results have been obtained using Powell optimizations in Model-Free, the S2 and values are the average values of the different residues contained in N (ZF1) and C (ZF2) domains. The selected residues are those that contain at both fields neither signs of conformational exchange neither large amplitude, long time scale internal motions (characterized by low heteronuclear nOe). In (a) the relevant parameter for model 1 is S2 and those relevant for model 5 (that contained both a fast and slow component) is . The value is related to the fast motion described by the model 5, recall that with ModelFree, we cannot extract the value of the correlation time of the fast motion as it is supposed to be extremely fast. See Table 1 for information on the presented parameters. E/N is the residual error per residue.