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Updated: Jul 10, 2026
15:22
Nucleoside Triphosphates - From Synthesis to Biochemical Characterization
Published on: April 3, 2014
Ternary borate-nucleoside complex stabilization by ribonuclease A demonstrates phosphate mimicry
Scott A Gabel1, Robert E London
1National Institute of Environmental Health Sciences, Research Triangle Park, NC, 27709, USA.
Summary
Borate esters can mimic phosphate esters, binding to proteins like ribonuclease A. This discovery offers new insights into enzyme mechanisms and potential therapeutic strategies.
Area of Science:
- Biochemistry
- Structural Biology
- Enzyme Kinetics
Background:
- Phosphate esters are crucial for cellular energy, signaling, and protein function.
- Borate anions structurally resemble phosphate and can form esters with hydroxyl groups.
Purpose of the Study:
- To investigate if proteins recognizing phosphate esters can bind nonenzymatically formed borate esters.
- To characterize the binding interactions between borate esters and ribonuclease A (RNase A).
Main Methods:
- (11)B Nuclear Magnetic Resonance (NMR) spectroscopy.
- Enzyme activity assays.
- Binding studies using cytidine analogs and borate.
Main Results:
- Formation of a stable ternary complex between RNase A, 3'-deoxycytidine, and borate, mimicking a phosphate inhibitor complex.
- Demonstrated the necessity of the 2'-hydroxyl group for borate ester complex formation.
- Showed that 2'-cytidine monophosphate (2'-CMP) can displace bound borate esters.
- Observed strong binding of a cyclic cytidine-2',3'-borate ester to RNase A, comparable to natural substrates.
Conclusions:
- Borate esters can effectively mimic phosphate esters in protein binding sites.
- These findings support the hypothesis that in situ borate ester formation can aid enzyme catalysis.
- The study provides a foundation for understanding borate-protein interactions and their implications in biological systems.
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