Molecular dynamics simulation studies on the aggregation of amyloid-β peptides and their disaggregation by ultrasonic wave and infrared laser irradiation

H Okumura, SG Itoh - Molecules, 2022 - mdpi.com
Alzheimer's disease is understood to be caused by amyloid fibrils and oligomers formed by
aggregated amyloid-β (Aβ) peptides. This review article presents molecular dynamics (MD) …

Temperature and pressure denaturation of chignolin: Folding and unfolding simulation by multibaric‐multithermal molecular dynamics method

H Okumura - Proteins: Structure, Function, and Bioinformatics, 2012 - Wiley Online Library
A multibaric‐multithermal molecular dynamics (MD) simulation of a 10‐residue protein,
chignolin, was performed. All‐atom model with the Amber parm99SB force field was used for …

Replica-permutation method with the Suwa–Todo algorithm beyond the replica-exchange method

SG Itoh, H Okumura - Journal of chemical theory and computation, 2013 - ACS Publications
We propose a new method for molecular dynamics and Monte Carlo simulations, which is
referred to as the replica-permutation method (RPM), to realize more efficient sampling than …

Enhanced sampling algorithms

A Mitsutake, Y Mori, Y Okamoto - Biomolecular Simulations: Methods and …, 2013 - Springer
In biomolecular systems (especially all-atom models) with many degrees of freedom such as
proteins and nucleic acids, there exist an astronomically large number of local-minimum …

Temperature and pressure dependence of alanine dipeptide studied by multibaric− multithermal molecular dynamics simulations

H Okumura, Y Okamoto - The Journal of Physical Chemistry B, 2008 - ACS Publications
We applied the multibaric− multithermal (MUBATH) molecular dynamics (MD) algorithm to
an alanine dipeptide in explicit water. The MUBATH MD simulation covered a wide range of …

Multidimensional generalized-ensemble algorithms for complex systems

A Mitsutake, Y Okamoto - The Journal of Chemical Physics, 2009 - pubs.aip.org
We give general formulations of the multidimensional multicanonical algorithm, simulated
tempering, and replica-exchange method. We generalize the original potential energy …

Multibaric–multithermal ensemble molecular dynamics simulations

H Okumura, Y Okamoto - Journal of computational chemistry, 2006 - Wiley Online Library
We present new generalized‐ensemble molecular dynamics simulation algorithms, which
we refer to as the multibaric–multithermal molecular dynamics. We describe three algorithms …

Replica-exchange method in van der Waals radius space: Overcoming steric restrictions for biomolecules

SG Itoh, H Okumura, Y Okamoto - The Journal of chemical physics, 2010 - pubs.aip.org
We present a new type of the Hamiltonian replica-exchange method, where the van der
Waals radius parameter and not the temperature is exchanged. By decreasing the van der …

Generalized-ensemble algorithms for the isobaric–isothermal ensemble

Y Mori, Y Okamoto - Journal of the Physical Society of Japan, 2010 - journals.jps.jp
We present generalized-ensemble algorithms for isobaric–isothermal molecular simulations.
In addition to the multibaric–multithermal algorithm and replica-exchange method for the …

Transformation of a design peptide between the α-helix and β-hairpin structures using a helix-strand replica-exchange molecular dynamics simulation

H Okumura, SG Itoh - Physical Chemistry Chemical Physics, 2013 - pubs.rsc.org
We investigated the transformation between the α-helix and β-hairpin structures of an 18-
residue design peptide, whose sequence is INYWLAHAKAGYIVHWTA. This peptide has …