Aryl-bis-(scorpiand)-aza receptors differentiate between nucleotide monophosphates by a combination of aromatic, hydrogen bond and electrostatic interactions

Org Biomol Chem. 2015 Feb 14;13(6):1732-40. doi: 10.1039/c4ob02084g.

Abstract

Bis-polyaza pyridinophane scorpiands bind nucleotides in aqueous medium with 10-100 micromolar affinity, predominantly by electrostatic interactions between nucleotide phosphates and protonated aliphatic amines and assisted by aromatic stacking interactions. The pyridine-scorpiand receptor showed rare selectivity toward CMP with respect to other nucleotides, whereby two orders of magnitude affinity difference between CMP and UMP was the most appealing. The phenanthroline-scorpiand receptor revealed at pH 5 strong selectivity toward AMP with respect to other NMPs, based on the protonation of adenine heterocyclic N1. The results stress that the efficient recognition of small biomolecules within scorpiand-like receptors relies mostly on the electrostatic and H-bonding interactions despite the competitive interactions in the bulk solvent, thus supporting further optimisation of this versatile artificial moiety.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aza Compounds / chemistry*
  • Hydrogen Bonding
  • Hydrogen-Ion Concentration
  • Macrocyclic Compounds / chemistry*
  • Magnetic Resonance Spectroscopy
  • Models, Molecular
  • Molecular Structure
  • Nucleotides / chemistry*
  • Phosphates / chemistry*
  • Static Electricity

Substances

  • Aza Compounds
  • Macrocyclic Compounds
  • Nucleotides
  • Phosphates