Abstract

The steady-state fluorimetric titration curves for trimeric purine nucleoside phosphorylase (PNP) by two ligands, were analysed using the DynaFit program. Results of this analysis indicate that three binding sites of PNP molecule interact with each other and that the character of this interaction is different for both ligands. The DynaFit program is very useful in studies of oligomeric proteins, but for detection of non-interacting sites some independent tests are necessary.

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