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Related Concept Videos

¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Infrared spectroscopy, also known as vibrational spectroscopy, is mainly used to determine the types of bonds and functional groups in molecules. In aldehydes and ketones, the carbonyl (C=O) bond shows an absorption around 1710 cm-1. The C=O bond vibration of an aldehyde occurs at lower frequencies than that of a ketone. In addition to the C=O absorption in an aldehyde, the aldehydic C–H bond also gives two peaks in the 2700–2800 cm-1 range. This absorption, coupled with the C=O stretching, is...
IR Spectroscopy: Molecular Vibration Overview01:24

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When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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From vibrations to function: Spectroscopic detection and quantification of π-π stacking in drug-responsive protein

Narangerel Altangerel1, Esther J Ocola1, Benjamin W Neuman1

  • 1Texas A&M University, College Station, TX 77843, USA.

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A new spectroscopic method, TRIP, directly measures aromatic π-π stacking in proteins. This technique precisely quantifies interactions within the SARS-CoV-2 main protease (Mpro), aiding in the design of effective antiviral drugs.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Drug Discovery

Background:

  • Aromatic π-π stacking is crucial for protein structure and function.
  • Quantifying these interactions in biological settings is difficult.
  • The SARS-CoV-2 main protease (Mpro) is a key drug target.

Purpose of the Study:

  • To develop and validate a method for direct, label-free quantification of aromatic π-π interactions.
  • To investigate π-π stacking in the SARS-CoV-2 Mpro dimer.
  • To correlate π-π stacking strength with drug efficacy.

Main Methods:

  • Thermostable Raman interaction profiling (TRIP) spectroscopy.
  • Analysis of phenylalanine benzene ring breathing (BRB) modes.
  • Density functional theory (DFT) calculations.
  • Biochemical assays and cell-based antiviral efficacy tests.

Main Results:

  • TRIP successfully detected and quantified π-π stacking in Mpro.
  • BRB spectral changes correlated with Mpro dimerization and ligand binding.
  • Potent inhibitors (MPI8, nirmatrelvir) showed stronger π-π stacking signals.
  • Spectroscopic data correlated with IC50 values and antiviral activity.

Conclusions:

  • TRIP is a robust tool for probing π-π stacking in native-like protein environments.
  • This method can guide the design of drugs targeting aromatic protein-protein interfaces.
  • Understanding π-π stacking is vital for developing effective therapeutics.