Abstract
A protein design strategy was developed to specifically enhance the rate of association (kon) between a pair of proteins without affecting the rate of dissociation (koff). The method is based on increasing the electrostatic attraction between the proteins by incorporating charged residues in the vicinity of the binding interface. The contribution of mutations towards the rate of association was calculated using a newly developed computer algorithm, which predicted accurately the rate of association of mutant protein complexes relative to the wild type. Using this design strategy, the rate of association and the affinity between TEM1 β-lactamase and its protein inhibitor BLIP was enhanced 250-fold, while the dissociation rate constant was unchanged. The results emphasize that long range electrostatic forces specifically alter kon, but do not effect koff. The design strategy presented here is applicable for increasing rates of association and affinities of protein complexes in general.
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Acknowledgements
G.S. holds the Dewey David Stone and Harry Levine career development chair. This research was supported by a research grant from the Crown endowment fund for immunological research. We thank J. Sussman and A. Horovitz for their critical reading of the manuscript.
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Selzer, T., Albeck, S. & Schreiber, G. Rational design of faster associating and tighter binding protein complexes . Nat Struct Mol Biol 7, 537–541 (2000). https://doi.org/10.1038/76744
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DOI: https://doi.org/10.1038/76744
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