DOI: 10.1002/qua.560290420. Factors influencing proton positions in biomolecules

Factors influencing proton positions in biomolecules

10.1002/qua.560290420

Crossref journal-article

Wiley

International Journal of Quantum Chemistry (311)

Abstract

AbstractResults of quantum mechanical calculations are presented that suggest a number of mechanisms whereby protons may be shifted from one group to another along an H bond. The first factor to be considered is a stretching of the bond that drastically raises the energy barrier to transfer. It is possible to predict barriers for an arbitrary system based only on results for a simple system and knowledge of the relevant bond length in the isolated subsystems. Factors that increase the intrinsic basicity of the B group in A‐H‐B lead not only to a lowering of the energy of the A‐HB state relative to AH‐B but also to a reduction in the barrier to transfer of the proton from A to B. Ions in the vicinity of the H bond exert a powerful influence and can shift the proton to the less basic group across a gradient of several pK units. Rather than shielding the proton from the external ion, the H bond acts instead to amplify the effects of the electric field. Reorientation of the A and B groups relative to one another, i.e., bends of the H bond, also produce surprisingly large changes in the relative energies of the AH‐B and A‐HB states. Such bends are capable of pushing the proton across to the normally less basic group, providing a mechanism of coupling conformational changes to proton ‘pumping’ activity. It is found that the high and low pH states of a given H bond can have dramatically differnt relative populations of the AH‐B and A‐HB configurations. These observations are explained in terms of fundamental concepts involving electrostatic interaction energies.

Bibliography

Scheiner, S., Redfern, P., & Hillenbrand, E. A. (1986). Factors influencing proton positions in biomolecules. International Journal of Quantum Chemistry, 29(4), 817â827. Portico.

Authors 3

Steve Scheiner (first)
Paul Redfern (additional)
Eric A. Hillenbrand (additional)

References 24 Referenced 25

10.1038/191144a0
10.1126/science.388618
{'key': 'e_1_2_1_3_2', 'volume-title': 'A New Look at Mechanisms in Bioenergetics', 'author': 'Racker E.', 'year': '1976'} / A New Look at Mechanisms in Bioenergetics by Racker E. (1976)
{'key': 'e_1_2_1_4_2', 'volume-title': 'Chemiosmotic Proton Circuits in Biological Membranes', 'author': 'Skulachev V. P.', 'year': '1981'} / Chemiosmotic Proton Circuits in Biological Membranes by Skulachev V. P. (1981)
10.1016/B978-0-12-294350-8.50014-3
10.1073/pnas.75.1.298
10.1063/1.439674
10.1007/BF01870590
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10.1146/annurev.bi.51.070182.003103
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10.1073/pnas.82.9.2741
10.1021/j100260a021
10.1021/j100248a017
S.ScheinerandP.Redfern J. Phys. Chem.(submitted for publication).
10.1021/ar00114a003
E. A.HillenbrandandS.Scheiner(unpublished results).
J. S.Binkley R. A.Whiteside R.Krishnan R.Seeger D. J.DeFrees H. B.Schlegel L. R.Kahn andJ. A.Pople QCPE Prog. No. 406 (1981).
10.1063/1.1674902

Dates

Type	When
Created	20 years, 8 months ago (Dec. 28, 2004, 3:06 a.m.)
Deposited	1 year, 10 months ago (Oct. 20, 2023, 9:14 p.m.)
Indexed	1 year, 10 months ago (Oct. 30, 2023, 8:41 p.m.)
Issued	39 years, 5 months ago (April 1, 1986)
Published	39 years, 5 months ago (April 1, 1986)
Published Online	20 years, 10 months ago (Oct. 19, 2004)
Published Print	39 years, 5 months ago (April 1, 1986)

Funders 0

None

BibTeX

@article{Scheiner_1986, title={Factors influencing proton positions in biomolecules}, volume={29}, ISSN={1097-461X}, url={http://dx.doi.org/10.1002/qua.560290420}, DOI={10.1002/qua.560290420}, number={4}, journal={International Journal of Quantum Chemistry}, publisher={Wiley}, author={Scheiner, Steve and Redfern, Paul and Hillenbrand, Eric A.}, year={1986}, month=apr, pages={817–827} }

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