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'Strain effect' descriptors for ATP and ADP derivatives with modified phosphate groups
Katrin Sak1, Jaak Järv, Mati Karelson
1Institute of Chemical Physics, Tartu University, Estonia.
Computers & Chemistry
|July 26, 2002
Summary
Modifying the phosphate groups of adenosine triphosphate (ATP) and adenosine diphosphate (ADP) with imido, methylene, or sulfur atoms alters their conformational strain. This strain impacts how these nucleotide analogs interact with biological targets.
Area of Science:
- Computational Chemistry
- Molecular Modeling
- Biochemistry
Background:
- Adenosine triphosphate (ATP) and adenosine diphosphate (ADP) are crucial energy carriers and signaling molecules in biological systems.
- Understanding the conformational properties of nucleotide analogs is essential for designing enzyme inhibitors and studying molecular interactions.
Purpose of the Study:
- To investigate the conformational strain introduced by modifying the phosphate groups of ATP and ADP.
- To quantify the effect of specific substitutions (imido, methylene, sulfur) on nucleotide conformation and energy.
- To correlate the calculated conformational strain energy with known biological activities of modified nucleotides.
Main Methods:
- Semiempirical AM1 calculations were employed to optimize the conformations of ATP, ADP, and their phosphate-modified analogs.
- Conformational strain energy was calculated as the energy difference between parent nucleotides and their modified counterparts.
- Geometric and energetic parameters were analyzed to assess the impact of substituent type and position.
Main Results:
- Phosphate modifications significantly influenced the conformational strain of ATP and ADP analogs.
- The magnitude of conformational strain depended on both the nature of the substituent and its location within the phosphate chain.
- Substitutions between terminal phosphorus atoms resulted in the largest conformational strain.
- A significant correlation was observed between conformational strain energy and biological activity for specific binding sites.
Conclusions:
- The conformational strain introduced by phosphate modifications in ATP and ADP analogs is position-dependent.
- Conformational strain energy serves as a valuable metric for predicting the biological activity of nucleotide analogs.
- These findings have implications for the rational design of nucleotide-based therapeutics and biochemical probes.