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  Proton transfer reactions in aqueous solutions of pyridoxamine phosphate.

Reiter, J., Schuster, P., Winkler, H., & Eggers, F. (1988). Proton transfer reactions in aqueous solutions of pyridoxamine phosphate. European Biophysics Journal, 16(4), 219-229. doi:10.1007/BF00261264.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-F334-D Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-F336-9
Genre: Journal Article

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Reiter, J., Author
Schuster, P., Author
Winkler, H., Author
Eggers, F.1, Author              
Affiliations:
1Abteilung Experimentelle Methoden, MPI for biophysical chemistry, Max Planck Society, ou_578551              

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 Abstract: UV-visible and 13C NMR measurements described in the literature and our 31P NMR measurements support the following mechanism of proton transfer reactions in aqueous solutions of pyridoxamine phosphate: Only the tautomeric equilibrium between neutral form, AN, and zwitterion, AZ, which is analogous to the tautomeric equilibrium of 3-hydroxypyridine in aqueous solution, is important, and that equilibrium does not change upon the dissociation of the second phosphate proton. With these simplifying assumption, we have simulated the relaxation spectrum of the proton transfer reactions of pyridoxamine phosphate in water using parameters from analogous reactions and compared it with our ultrasound and temperature jump measurements. We have found that the relaxation process measured by the temperature jump experiment is mainly caused by the overall reaction AN=AZ (or AN-=AZ-) and the ultrasound absorption at the isoelectric point between pK2 and pK3 is mainly caused by the overall reaction A + +xA−N+(1−x)A−Z=yAN+(2−y)AZ,0≦x≦1,0≦y≦2.

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Language(s): eng - English
 Dates: 1988
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1007/BF00261264
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Title: European Biophysics Journal
Source Genre: Journal
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Pages: - Volume / Issue: 16 (4) Sequence Number: - Start / End Page: 219 - 229 Identifier: -