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The structures and properties of anionic tryptophan complexes.

Christian Ieritano1, Joshua Featherstone1, Patrick J J Carr1

  • 1Department of Chemistry, University of Waterloo, Waterloo, ON N2L 3G1, Canada. shopkins@uwaterloo.ca.

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Summary
This summary is machine-generated.

This study reveals how tryptophan clusters interact with chloride and deprotonation. Hydrogen bonding and charge-quadrupole forces dictate cluster structures, with specific interactions observed in larger clusters.

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Area of Science:

  • Physical Chemistry
  • Computational Chemistry
  • Spectroscopy

Background:

  • Tryptophan clusters are fundamental units in biological systems.
  • Understanding their interactions is key to molecular recognition.
  • Previous studies have explored tryptophan cluster properties.

Purpose of the Study:

  • To investigate the physicochemical properties of deprotonated and chlorinated tryptophan clusters ([Trpn-H]- and [TrpnCl]-, n=1, 2).
  • To elucidate the role of non-covalent interactions in cluster formation and stability.
  • To determine the site of deprotonation in tryptophan anions.

Main Methods:

  • Combined experimental Infrared Multiple Dissociation (IRMPD) spectroscopy.
  • Computational modeling to determine global minimum and low-energy geometries.
  • Analysis of spectral data in the 850-1900 cm-1 region.

Main Results:

  • Deprotonation in [Trpn-H]- clusters is localized on the carboxylic acid group.
  • Hydrogen bonding and charge-quadrupole interactions significantly influence cluster geometries.
  • In [TrpCl]- and [Trp2Cl]-, the indole NH group coordinates the chloride anion.
  • [Trp2-H]- and [Trp2Cl]- exhibit stabilizing π-π interactions between side chains.

Conclusions:

  • The study provides detailed insights into the structure and bonding of tryptophan-based anions.
  • Non-covalent interactions, including hydrogen bonding, charge-quadrupole, and π-π interactions, are crucial for stabilizing these clusters.
  • The findings contribute to a deeper understanding of molecular interactions in complex systems.