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Peptide Bonds

Peptide Bonds

A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...

Protein Folding

Protein Folding

Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...

Protein Folding

Protein Folding

Protein Organization

Protein Organization

Protein Organization

Protein Organization

Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence.

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Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides

Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides

Published on: November 21, 2013

Rate of loop formation in peptides: a simulation study.

Matthias J Feige¹, Emanuele Paci

¹Department Chemie, Technische Universität München, 85747 Garching, Germany.

Journal of Molecular Biology

|July 23, 2008

Summary

This summary is machine-generated.

Advanced experimental methods and computer simulations reveal how protein segments form contacts. This research offers insights into protein dynamics and validates molecular models by comparing simulation data with experimental findings.

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Area of Science:

Biophysics
Computational Biology
Protein Dynamics

Background:

High-resolution experimental techniques enhance understanding of biological macromolecule self-organization and function.
Triplet-triplet energy transfer and fluorescence quenching are key methods for studying molecular interactions.

Purpose of the Study:

To illustrate the synergy between simulation and experiment in studying peptide and protein dynamics.
To determine the time scales of residue contact formation in peptides and proteins.
To validate molecular models used in simulations against experimental data.

Main Methods:

Utilizing advanced experimental techniques like triplet-triplet energy transfer and fluorescence quenching.
Performing molecular dynamics simulations of peptides with varying compositions and lengths.
Comparing simulation-derived contact formation rates with experimental measurements.

Main Results:

Simulation and experimental data on peptide end-to-end contact formation rates show agreement for certain sequences and force fields.
Deviations between simulation and experiment are attributed to artefactual peptide structuring in some models.
Realistic models reveal non-Gaussian end-to-end distance distributions, indicating rugged energy landscapes.

Conclusions:

The convergence of simulation and experiment provides microscopic interpretations of protein dynamics.
Experimental data serve as a critical test for the accuracy of molecular models.
Accurate modeling of solvation is crucial for reproducing experimental observations in peptide simulations.