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Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides
Published on: November 21, 2013
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Probing nano-patterned peptide self-organisation at the aqueous graphene interface
Zak E Hughes1, Tiffany R Walsh
1Institute for Frontier Materials, Deakin University, Geelong, VIC 3216, Australia. tiffany.walsh@deakin.edu.au.
Nanoscale
|December 7, 2017
Summary
Molecular dynamics simulations reveal that the GrBP5 peptide binds graphene via its C-terminal region. Peptide aggregates form, but lack ordered patterns at the aqueous interface, suggesting drying effects influence observed structures.
Area of Science:
- Biomaterials science
- Surface chemistry
- Computational biophysics
Background:
- Graphene's unique properties make it a promising material for various applications.
- Peptide adsorption on graphene surfaces is crucial for developing graphene-based biosensors and biomaterials.
- Understanding peptide-graphene interactions at the molecular level is essential for controlling self-assembly and material properties.
Purpose of the Study:
- To elucidate the molecular conformations and spatial ordering of GrBP5 peptide adsorbed on graphene under aqueous conditions.
- To investigate the binding mechanisms and self-assembly behavior of GrBP5 and its mutants at the graphene-water interface.
- To determine factors influencing the formation of ordered peptide over-layers on graphene.
Main Methods:
- Advanced molecular dynamics (MD) simulations were employed to model the behavior of GrBP5 and related mutant sequences.
- Simulations focused on the aqueous graphene interface to resolve molecular conformations and over-layer ordering.
- Analysis of inter-chain interactions, including hydrogen bonding and charge-charge interactions, was performed.
Main Results:
- GrBP5 peptide binds to graphene primarily through its tyrosine-rich C-terminal region, consistent with previous hypotheses.
- Simulations showed that adsorbed GrBP5 peptide chains form aggregates but do not evolve into ordered patterns at the aqueous interface.
- Inter-chain interactions are dominated by hydrogen bonding and charge-charge interactions, which are not specific enough to drive pattern formation.
Conclusions:
- The experimentally observed ordered over-layer pattern may arise from sample drying rather than intrinsic self-assembly at the solvated interface.
- The current GrBP5 sequence does not promote ordered over-layer formation under aqueous conditions.
- Sequence modifications of GrBP5 could potentially be designed to achieve ordered peptide over-layers at the aqueous graphene interface.
