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Related Concept Videos

2D NMR: Homonuclear Correlation Spectroscopy (COSY)01:06

2D NMR: Homonuclear Correlation Spectroscopy (COSY)

Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
¹H NMR Signal Integration: Overview00:58

¹H NMR Signal Integration: Overview

The intensity of a signal, which can be represented by the area under the peak, depends on the number of protons contributing to that signal. The area under each peak is shown as a vertical line called an integral, with the integral value listed under it, as seen in the proton NMR spectrum of benzyl acetate. Each integral value is divided by the smallest integral value to obtain the ratio of the number of protons producing each signal. The ratio reveals the relative number of protons and not...
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...
NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...

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Structure simulation with calculated NMR parameters - integrating COSMOS into the CCPN framework.

Olaf Schneider1, Rasmus H Fogh, Ulrich Sternberg

  • 1Steinbuch Centre for Computing, Karlsruhe Institute of Technology, Germany.

Studies in Health Technology and Informatics
|September 4, 2012
PubMed
Summary
This summary is machine-generated.

The Collaborative Computing Project for NMR (CCPN) framework now integrates Computer Simulation of Molecular Structures (COSMOS) software. This integration enhances nuclear magnetic resonance (NMR) data analysis and protein structure evaluation using novel computational methods.

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Area of Science:

  • Structural Biology
  • Computational Chemistry
  • Biophysics

Background:

  • The Collaborative Computing Project for NMR (CCPN) provides a software framework for NMR data management and analysis.
  • Integration of external computational tools can extend the capabilities of existing NMR software frameworks.
  • Accurate calculation of molecular properties and energies is crucial for structural biology applications.

Purpose of the Study:

  • To integrate the Computer Simulation of Molecular Structures (COSMOS) software into the CCPN framework.
  • To develop a hybrid computational approach (COSMOS-NMR) combining quantum chemistry and molecular mechanics for NMR data.
  • To evaluate the utility of the integrated framework for protein structure analysis using NMR-derived chemical shifts.

Main Methods:

  • Development of an interface between the COSMOS software and the CCPN data model and APIs.
  • Implementation of the COSMOS-NMR force field, uniting quantum chemical routines with molecular mechanics.
  • Utilizing COSMOS-NMR to introduce NMR parameters as constraints in molecular mechanics calculations.
  • Testing the framework by evaluating protein structures using calculated 13C Cα and Cβ chemical shifts.

Main Results:

  • Successful initial integration of COSMOS into the CCPN framework.
  • Development of the COSMOS-NMR force field for enhanced molecular energy calculations.
  • Demonstrated application of the integrated system for protein structure evaluation using COSMOS-derived chemical shifts.

Conclusions:

  • The integration of COSMOS into the CCPN framework offers a powerful new infrastructure for the NMR community.
  • The COSMOS-NMR force field enables more accurate molecular simulations incorporating NMR data.
  • Future developments will expand the applications of this integrated computational NMR framework.