Δημοσιεύσεις

Project Acronym: SHYPEPG
Title: Molecular Dynamics Simulations of Hybrid Peptide/Graphene Systems
Affiliation: universityofcrete
Pi: Vagelis Harmandaris
Research Field: chemical sciences and materials

Self-assembly of Alanine-Isoleucine and Isoleucine-Isoleucine Dipeptides through Atomistic Simulations and Experiments
by Anastassia N. Rissanou, Georgios Simatos, Panagiota Siachouli, Vagelis Harmandaris, Anna Mitraki
Abstract:
A detailed investigation of the structural and conformational properties of alanine-isoleucine (Ala-Ile) and isoleucine-isoleucine (Ile-Ile) dipeptides is presented in water and in methanol solvents. We propose a consistent combination of complementary simulation and experimental methods, covering a broad range of length and time scales, from the very short (i.e., atomic level), via all-atom molecular dynamics (MD) simulations, up to the macroscopic one, via scanning electron microscopy (SEM) experiments. The examined samples from both simulations and experiment cover a board range of concentrations since these are usually in different concentration windows (i.e., high values in simulations vs low values in experiments). In the present study, there is an overlapping concentration regime and a qualitative agreement between simulation and experimental results is observed. The effect of temperature on the formed structures is found to be small, from both simulation and experiments, when temperature varies from 278 to 300 K. Furthermore, the differences of Ala-Ile and Ile-Ile dipeptides from dialanine (Ala-Ala) and diphenylalanine (Phe-Phe) dipeptides in similar conditions are highlighted. Based on various measures, the strength of the self-assembly propensity of the four dipeptides in aqueous solutions attains the following order: Phe-Phe > Ala-Ile > Ala-Ala > Ile-Ile.
Reference:
Self-assembly of Alanine-Isoleucine and Isoleucine-Isoleucine Dipeptides through Atomistic Simulations and Experiments (Anastassia N. Rissanou, Georgios Simatos, Panagiota Siachouli, Vagelis Harmandaris, Anna Mitraki), In J. Phys. Chem. B, 2020.
Bibtex Entry:
@article{doi:10.1021-acs.jpcb.0c03025,
 author = {Anastassia N. Rissanou, Georgios Simatos, Panagiota Siachouli, Vagelis Harmandaris, Anna Mitraki},
 doi = {10.1021/acs.jpcb.0c03025},
 url = {https://doi.org/10.1021/acs.jpcb.0c03025},
 year = {2020},
 bibyear = {2020},
 journal = {J. Phys. Chem. B},
 title = {Self-assembly of Alanine-Isoleucine and Isoleucine-Isoleucine Dipeptides through Atomistic Simulations and Experiments},
 abstract = {A detailed investigation of the structural and conformational properties of alanine-isoleucine (Ala-Ile) and isoleucine-isoleucine (Ile-Ile) dipeptides is presented in water and in methanol solvents. We propose a consistent combination of complementary simulation and experimental methods, covering a broad range of length and time scales, from the very short (i.e., atomic level), via all-atom molecular dynamics (MD) simulations, up to the macroscopic one, via scanning electron microscopy (SEM) experiments. The examined samples from both simulations and experiment cover a board range of concentrations since these are usually in different concentration windows (i.e., high values in simulations vs low values in experiments). In the present study, there is an overlapping concentration regime and a qualitative agreement between simulation and experimental results is observed. The effect of temperature on the formed structures is found to be small, from both simulation and experiments, when temperature varies from 278 to 300 K. Furthermore, the differences of Ala-Ile and Ile-Ile dipeptides from dialanine (Ala-Ala) and diphenylalanine (Phe-Phe) dipeptides in similar conditions are highlighted. Based on various measures, the strength of the self-assembly propensity of the four dipeptides in aqueous solutions attains the following order: Phe-Phe > Ala-Ile > Ala-Ala > Ile-Ile.},
}