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Published on: November 23, 2019
Selective pyrophosphate recognition by cyclic peptide receptors in physiological saline
Stephen J Butler1, Katrina A Jolliffe
1School of Chemistry (Building F11), The University of Sydney, NSW, 2006, Australia.
Chemistry, an Asian Journal
|September 12, 2012
Summary
Researchers developed cyclic peptides that selectively bind pyrophosphate over ATP and ADP. This anion recognition was enhanced in Krebs buffer, enabling selective pyrophosphate sensing in biological conditions.
Area of Science:
- Supramolecular Chemistry
- Coordination Chemistry
- Analytical Chemistry
Background:
- Anion recognition is crucial for biological processes and chemical sensing.
- Cyclic peptides offer versatile scaffolds for designing selective molecular receptors.
- Developing sensors for biologically relevant anions like polyphosphates remains a challenge.
Purpose of the Study:
- To investigate the anion binding properties of bis(Zn(II)-Dpa) functionalized cyclic peptides.
- To explore how structural modifications influence polyphosphate ion selectivity.
- To develop selective chemosensing ensembles for pyrophosphate in biological media.
Main Methods:
- Synthesis of bis(Zn(II)-Dpa) functionalized cyclic peptides.
- Anion binding studies using fluorescence displacement assays with a coumarin indicator.
- Evaluation of receptor performance in various media (water, saline, Krebs buffer).
Main Results:
- Structural factors like steric bulk, binding site proximity, and scaffold size significantly impact polyphosphate discrimination.
- Receptors demonstrated selectivity for pyrophosphate over ATP and ADP in aqueous and saline solutions.
- Selectivity for pyrophosphate was substantially enhanced in Krebs buffer, enabling selective recognition in complex biological environments.
Conclusions:
- Bis(Zn(II)-Dpa) functionalized cyclic peptides can be engineered for selective anion recognition.
- The findings highlight the importance of the binding environment in modulating receptor selectivity.
- These chemosensing ensembles show promise for detecting pyrophosphate in biological samples.
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