DOI: 10.1110/ps.8.1.180. Thermodynamic linkage between the binding of protons and inhibitors to HIV‐1 protease

Thermodynamic linkage between the binding of protons and inhibitors to HIV‐1 protease

10.1110/ps.8.1.180

Crossref journal-article

Wiley

Protein Science (311)

Abstract

AbstractThe aspartyl dyad of free HIV‐1 protease has apparent pKas of ∼3 and ∼6, but recent NMR studies indicate that the aspartyl dyad is fixed in the doubly protonated form over a wide pH range when cyclic urea inhibitors are bound, and in the monoprotonated form when the inhibitor KNI‐272 is bound. We present computations and measurements related to these changes in protonation and to the thermodynamic linkage between protonation and inhibition. The Poisson‐Boltzmann model of electrostatics is used to compute the apparent pKas of the aspartyl dyad in the free enzyme and in complexes with four different inhibitors. The calculations are done with two parameter sets. One assigns ϵ = 4 to the solute interior and uses a detailed model of ionization; the other uses ϵ = 20 for the solute interior and a simplified representation of ionization. For the free enzyme, both parameter sets agree well with previously measured apparent pKas of ∼3 and ∼6. However, the calculations with an internal dielectric constant of 4 reproduce the large pKa shifts upon binding of inhibitors, but the calculations with an internal dielectric constant of 20 do not. This observation has implications for the accurate calculation of pKas in complex protein environments.Because binding of a cyclic urea inhibitor shifts the pKas of the aspartyl dyad, changing the pH is expected to change its apparent binding affinity. However, we find experimentally that the affinity is independent of pH from 5.5 to 7.0. Possible explanations for this discrepancy are discussed.

Bibliography

Trylska, J., Antosiewicz, J., Geller, M., Hodge, C. N., Klabe, R. M., Head, M. S., & Gilson, M. K. (1999). Thermodynamic linkage between the binding of protons and inhibitors to HIVâ1 protease. Protein Science, 8(1), 180â195. Portico.

Authors 7

Joanna Trylska (first)
Jan Antosiewicz (additional)
Maciej Geller (additional)
C. Nicholas Hodge (additional)
Ronald M. Klabe (additional)
Martha S. Head (additional)
Michael K. Gilson (additional)

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Dates

Type	When
Created	14 years, 10 months ago (Oct. 1, 2010, 9:21 a.m.)
Deposited	1 year, 9 months ago (Oct. 28, 2023, 9:16 a.m.)
Indexed	1 year, 2 months ago (June 20, 2024, 3:47 a.m.)
Issued	26 years, 7 months ago (Jan. 1, 1999)
Published	26 years, 7 months ago (Jan. 1, 1999)
Published Online	16 years, 7 months ago (Dec. 31, 2008)
Published Print	26 years, 7 months ago (Jan. 1, 1999)

Funders 0

None

BibTeX

@article{Trylska_1999, title={Thermodynamic linkage between the binding of protons and inhibitors to HIV‐1 protease}, volume={8}, ISSN={1469-896X}, url={http://dx.doi.org/10.1110/ps.8.1.180}, DOI={10.1110/ps.8.1.180}, number={1}, journal={Protein Science}, publisher={Wiley}, author={Trylska, Joanna and Antosiewicz, Jan and Geller, Maciej and Hodge, C. Nicholas and Klabe, Ronald M. and Head, Martha S. and Gilson, Michael K.}, year={1999}, month=jan, pages={180–195} }

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