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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...

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Identifying Protein-protein Interaction Sites Using Peptide Arrays

Identifying Protein-protein Interaction Sites Using Peptide Arrays

Published on: November 18, 2014

Two-dimensional replica exchange approach for peptide-peptide interactions.

Jason Gee¹, M Scott Shell

¹Department of Chemical Engineering, University of California Santa Barbara, Santa Barbara, California 93106-5080, USA.

The Journal of Chemical Physics

|February 17, 2011

Summary

This summary is machine-generated.

Umbrella-sampling replica exchange molecular dynamics (UREMD) enhances peptide simulations. This method accurately models peptide-peptide interactions and free energy landscapes for improved structural analysis.

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Area of Science:

Computational chemistry and biophysics
Molecular dynamics simulations
Protein and peptide behavior

Background:

Replica exchange molecular dynamics (REMD) is a standard method for simulating complex free energy landscapes.
Simulating peptide-peptide interactions requires specialized methods to explore association-dissociation events.
Conventional REMD can be computationally intensive for systems with extensive reaction coordinates.

Purpose of the Study:

To introduce an enhanced REMD method, termed umbrella-sampling REMD (UREMD), for simulating peptide-peptide interactions.
To improve the exploration of the complete association-dissociation reaction coordinate in peptide systems.
To enable accurate calculations of free energy profiles and interpeptide distances.

Main Methods:

Developed UREMD, a two-dimensional replica cascade method combining temperature and umbrella sampling coordinates.
Linked temperature and umbrella dimensions at associated and dissociated states to optimize replica usage.
Utilized reweighting equations for accurate free energy profile and structural/energetic calculations.

Main Results:

Tested UREMD on tetrapeptide models for amyloid fibril formation and leucine zipper peptides.
Demonstrated good convergence properties and low statistical errors compared to conventional REMD.
Showcased UREMD's ability to sample near-native structures for leucine zipper systems.

Conclusions:

UREMD offers significant advantages for simulating peptide-peptide interactions and their free energy landscapes.
The method provides accurate calculations of normalized free energy profiles as a function of interpeptide separation.
UREMD is effective in sampling relevant conformational states, including near-native structures, for peptide systems.