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Conformation and ion-binding of oligonucleotides
Anna-Kaisa Kontturi1, Kyösti Kontturi, Arto Urtti
1Department of Chemical Engineering, Helsinki University of Technology, Espoo, Finland. anna.kontturi@hut.fi
Summary
Oligonucleotide properties like charge and shape affect drug potential. Longer molecules show higher ion-pairing, influencing how they distribute in the body.
Area of Science:
- Biochemistry
- Pharmaceutical Sciences
- Physical Chemistry
Background:
- Oligonucleotides are crucial in therapeutics, but their pharmaceutical properties depend on factors like effective charge and conformation.
- Understanding these properties is key to optimizing oligonucleotide drug delivery and efficacy.
Purpose of the Study:
- To measure the diffusion coefficient and effective charge number of oligonucleotides with varying chain lengths.
- To investigate the influence of temperature and ionic strength on these parameters.
Main Methods:
- Utilized a convective diffusion process to determine oligonucleotide diffusion coefficients and effective charge numbers.
- Experiments were conducted at physiological ionic strength (0.15 M NaCl) and temperatures of 20°C and 40°C.
Main Results:
- Longer oligonucleotides (15-30 nucleotides) exhibited strong ion-pairing (75-80%), while shorter ones (7 nucleotides) showed approximately 50% ion-pairing.
- Ion-binding extent was independent of temperature within the tested range.
- Oligonucleotides adopted a compact conformation in 0.15 M NaCl solution.
Conclusions:
- The compact conformation and significant ion-pairing of oligonucleotides suggest potential for enhanced tissue distribution.
- These findings provide insights into the pharmacokinetics of oligonucleotides, aiding in the development of novel therapeutic strategies.