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Related Concept Videos

Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Propagation of Uncertainty from Systematic Error01:10

Propagation of Uncertainty from Systematic Error

The atomic mass of an element varies due to the relative ratio of its isotopes. A sample's relative proportion of oxygen isotopes influences its average atomic mass. For instance, if we were to measure the atomic mass of oxygen from a sample, the mass would be a weighted average of the isotopic masses of oxygen in that sample. Since a single sample is not likely to perfectly reflect the true atomic mass of oxygen for all the molecules of oxygen on Earth, the mass we obtain from this particular...
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.
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Stereoisomers02:32

Stereoisomers

On the basis of mirror symmetry, stereoisomers of an organic molecule can be further classified into diastereomers and enantiomers. Diastereomers are stereoisomers that are not mirror images of each other. Substituted alkenes, such as the cis and trans isomers of 2-butene, are diastereomers, as these molecules exhibit different spatial orientations of their constituent atoms, are not mirror images of each other, and do not interconvert. Here, the interconversion is suppressed due to restricted...
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...

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Updated: Jun 1, 2026

Synthesizing Amino Acids Modified with Reactive Carbonyls in Silico to Assess Structural Effects Using Molecular Dynamics Simulations
05:57

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Published on: April 26, 2024

Stereochemical errors and their implications for molecular dynamics simulations.

Eduard Schreiner1, Leonardo G Trabuco, Peter L Freddolino

  • 1Beckman Institute for Advanced Science Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.

BMC Bioinformatics
|May 25, 2011
PubMed
Summary
This summary is machine-generated.

Stereochemical errors in biomolecular structures, such as incorrect chirality, can significantly impact molecular dynamics simulations. This study presents tools to identify, correct, and prevent these errors, ensuring accurate simulation results.

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Synthesizing Amino Acids Modified with Reactive Carbonyls in Silico to Assess Structural Effects Using Molecular Dynamics Simulations
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Area of Science:

  • Biophysics
  • Computational Biology
  • Structural Biology

Background:

  • Biological molecules exhibit stereoisomerism, critical for their function.
  • Molecular dynamics (MD) simulations are vital in biophysical research.
  • Stereochemical inaccuracies in biomolecular structures can lead to erroneous simulation outcomes.

Purpose of the Study:

  • To investigate the impact of stereochemistry, specifically chirality and peptide bond configurations, on protein secondary structure during simulations.
  • To identify common origins of stereochemical errors in biomolecular data.
  • To introduce software tools for detecting, rectifying, and avoiding stereochemical flaws in MD simulations.

Main Methods:

  • Analysis of stereochemical configurations (chirality and peptide bond planarity).
  • Molecular dynamics simulations to observe structural changes.
  • Development and application of computational tools for error detection and correction.

Main Results:

  • Demonstration of how chirality and peptide bond flips affect protein secondary structure in simulations.
  • Identification of prevalent sources contributing to stereochemical errors.
  • Availability of software to address these errors.

Conclusions:

  • The presented tools are essential for preparing accurate biomolecular simulations.
  • Implementing these tools aids in generating reliable predicted structural models for proteins and nucleic acids.
  • Standardizing the use of these tools will enhance the integrity of computational structural biology research.