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Ab initio discrete molecular dynamics approach to protein folding and aggregation
Journal article   Open access   Peer reviewed

Ab initio discrete molecular dynamics approach to protein folding and aggregation

Brigita Urbanc, Jose M Borreguero, Luis Cruz and H Eugene Stanley
Methods in enzymology, v 412, pp 314-338
2006
DOI: https://doi.org/10.1016/S0076-6879(06)12019-4
PMID: 17046666
Featured in Collection :   UN Sustainable Development Goals @ Drexel
url
https://doi.org/10.1016/s0076-6879(06)12019-4View
Published, Version of Record (VoR)Open Access (License Unspecified),  Open

Abstract

Hydrogen Bonding Models, Chemical Protein Structure, Secondary Computer Simulation Models, Molecular Protein Binding Protein Conformation Amyloid beta-Peptides - chemistry In Vitro Techniques Binding Sites Protein Folding
Understanding the toxicity of amyloidogenic protein aggregates and designing therapeutic approaches require the knowledge of their structure at atomic resolution. Although solid-state NMR, X-ray diffraction, and other experimental techniques are capable of discerning the protein fibrillar structure, determining the structures of early aggregates, called oligomers, is a challenging experimental task. Computational studies by all-atom molecular dynamics, which provides a complete description of a protein in the solvent, are typically limited to study folding of smaller protein or aggregation of a small number of short protein fragments. We review an efficient ab initio computer simulation approach to protein folding and aggregation using discrete molecular dynamics (DMD) in combination with several coarse-grained protein models and implicit solvent. This approach involves different complexity levels in both the protein model and the interparticle interactions. Starting from the simplest protein model with minimal interactions, and gradually increasing its complexity, while guided by in vitro findings, we can systematically select the key features of the protein model and interactions that drive protein folding and aggregation. Because the method used in this DMD approach does not require any knowledge of the native or any other state of the protein, it can be applied to study degenerative disorders associated with protein misfolding and aberrant protein aggregation. The choice of the coarse-grained model depends on the complexity of the protein and specific questions to be addressed, which are mostly suggested by in vitro findings. Thus, we illustrate our approach on amyloid beta-protein (Abeta) associated with Alzheimer's disease (AD). Despite the simplifications introduced in the DMD approach, the predicted Abeta conformations are in agreement with existing experimental data. The in silico findings also provide further insights into the structure and dynamics of Abeta folding and oligomer formation that are amenable to in vitro testing.

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Web of Science research areas
Biochemical Research Methods
Biochemistry & Molecular Biology
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