The self-association of naturally occurring purine nucleoside 5′-monophosphates in aqueous solution

Download
  1. Get@NRC: The self-association of naturally occurring purine nucleoside 5′-monophosphates in aqueous solution (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1139/v79-318
AuthorSearch for: ; Search for:
TypeArticle
Journal titleCanadian Journal of Chemistry
ISSN0008-4042
1480-3291
Volume57
Issue15
Pages19861994
AbstractThe parameters characterizing the base-stacking self-association of adenosine, inosine, and guanosine 5′-monophosphate have been obtained from ¹H nmr dilution studies. The thermodynamic parameters for the formation of adenosine 5′-monophosphate stacks are ΔH° = −14.5 kJ mol⁻¹ and ΔS° = −42.3 J K⁻¹ mol⁻¹, with an apparent equilibrium constant of Kc = 1.92 M⁻¹ at 30 °C. The corresponding equilibrium constants for the self-association of inosine and guanosine 5′-monophosphate are 1.36 M⁻¹ and 1.29 M⁻¹, respectively. The negative enthalpy and entropy changes cannot be explained by the concept of classical hydrophobic interactions; however, they strongly support the conclusion that dipole induced dipole forces play a major role for base-stacking in aqueous solution. The sequence of the equilibrium constants for the purine nucleoside 5′-monophosphates can be well explained by the concept of mutual polarization. The stacking geometries for adenosine and inosine 5′-monophosphate are presented as obtained from fitting the experimental shift data to refined isoshielding contours. It is concluded that the stacking pattern is not restricted to a unique geometry.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada
Peer reviewedYes
NRC number17446
NPARC number23001403
Export citationExport as RIS
Report a correctionReport a correction
Record identifier8bde8a03-8049-4baa-9476-659194dacab6
Record created2017-02-02
Record modified2017-02-02
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)
Date modified: