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Energetic Roles of Hydrogen Bonds at the Ureido Oxygen Binding Pocket in the Streptavidin−Biotin Complex

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Department of Bioengineering, Box 357962, University of Washington, Seattle, Washington 98195
Cite this: Biochemistry 1998, 37, 21, 7657–7663
Publication Date (Web):May 8, 1998
Copyright © 1998 American Chemical Society

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    The high-affinity streptavidin−biotin complex is characterized by an extensive hydrogen-bonding network. A study of hydrogen-bonding energetics at the ureido oxygen of biotin has been conducted with site-directed mutations at Asn 23, Ser 27, and Tyr 43. A new competitive biotin binding assay was developed to provide direct equilibrium measurements of the alterations in Kd. S27A, Y43F, Y43A, N23A, and N23E mutants display ΔΔG° at 37 °C relative to wild-type streptavidin of 2.9, 1.2, 2.6, 3.5, and 2.6 kcal/mol, respectively. The equilibrium-binding enthalpies for all of the mutants were measured by isothermal titration calorimetry, and the Y43A and N23A mutants display large decreases in the equilibrium binding enthalpy at 25 °C of 8.9 and 6.9 kcal/mol, respectively. The S27A and N23E mutants displayed small decreases in binding enthalpy of 1.6 and 0.9 kcal/mol relative to wild-type, while the Y43F mutant displayed a −2.6 kcal/mol increase in the binding enthalpy at 25 °C. At 37 °C, the Y43A and N23A mutants display decreases of 7.8 and 7.9 kcal/mol, respectively, while the S27A, N23E, and Y43F mutants displayed decreases of 4.9, 3.7, and 1.2 kcal/mol relative to wild-type. Kinetic analyses were also conducted to probe the contributions of the hydrogen bonds to the activation barrier. Wild-type streptavidin at 37 °C displays a koff of (4.1 ± 0.3) × 10-5 s-1, and the conservative Y43F, S27A, and N23A mutants displayed increases in koff to (20 ± 1) × 10-5 s-1, (660 ± 40) × 10-5 s-1, and (1030 ± 220) × 10-5 s-1, respectively. The Y43A and N23E mutants displayed 93-fold and 188-fold increases in koff, respectively. Activation energies and enthalpies for each of the mutants were determined by transition-state analysis of the dissociation rate temperature dependence. All of the mutants except Y43F display large reductions in the activation enthalpy. The Y43F mutant has a more positive activation enthalpy, and thus a more favorable activation entropy that underlies the overall reduction in the activation barrier. For the most conservative mutant at each ureido oxygen hydrogen-bonding position, bound-state alterations account for most of the energetic changes in a single transition-state model, suggesting that the ureido oxygen hydrogen-bonding interactions are broken in the dissociation transition state.

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     This work was supported by Grant DK49655 from the National Institutes of Health.

     Current Address:  Pharmaceutics, Mail Stop 8-1-C, Amgen, One Amgen Center Drive, Thousand Oaks, CA 91320-1789.


     To whom correspondence should be addressed. Phone:  (206) 685-8148. Fax:  (206) 685-8256. E-mail:  [email protected].

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