Measuring Local Electrostatic Potentials Around Nucleic Acids by Paramagnetic NMR Spectroscopy

Binhan Yu, Xi Wang, Junji Iwahara

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Electrostatic potentials around macromolecules in the presence of mobile charges are difficult to assess especially for highly charged systems. Here, we report measurements of local electrostatic potentials around DNA by paramagnetic NMR. Through quantitative analysis of NMR paramagnetic relaxation enhancement arising from positively charged or neutral paramagnetic cosolutes, we were able to determine local electrostatic potentials around 1H nuclei at >100 sites in major and minor grooves of 13C,15N-labeled 15-bp DNA at 100 mM NaCl. Our experimental electrostatic potential data directly confirmed the Coulombic end effects of DNA. The effective near-surface electrostatic potentials from the NMR data were in good agreement with the theoretical predictions with the Poisson-Boltzmann equation. This NMR method allows for unprecedented experimental investigations into the electrostatic properties of nucleic acids.

Original languageEnglish (US)
Pages (from-to)10025-10029
Number of pages5
JournalJournal of Physical Chemistry Letters
Volume13
Issue number42
DOIs
StatePublished - Oct 27 2022
Externally publishedYes

ASJC Scopus subject areas

  • General Materials Science
  • Physical and Theoretical Chemistry

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