that metals are not normally included in biomolecular forcefields.
Recently, Lennard-Jones (LJ) parameters for several
metals were developed,58 and the parameters are compatible
with some widely used empirical force-fields, such as Charmm,
Amber, and OPLS. Therefore, the corresponding OPLScompatible
LJ parameters for Au atoms were taken from ref
58. Partial charges of the AuNP core (144 Au and 60 S atoms)
were evaluated from the density functional (DF) calculations of
ref 51 by using electron density and the method of Bader
charges. The rigidity of the gold core was preserved by
introducing a number of virtual constant bonds and constraint
potentials between Au atoms of the core. Additional bonds and
constraint potentials were set for the Au−S interface structure
in order to maintain the correct geometry of the NP interior
(details given in the Supporting Information).
that metals are not normally included in biomolecular forcefields.Recently, Lennard-Jones (LJ) parameters for severalmetals were developed,58 and the parameters are compatiblewith some widely used empirical force-fields, such as Charmm,Amber, and OPLS. Therefore, the corresponding OPLScompatibleLJ parameters for Au atoms were taken from ref58. Partial charges of the AuNP core (144 Au and 60 S atoms)were evaluated from the density functional (DF) calculations ofref 51 by using electron density and the method of Badercharges. The rigidity of the gold core was preserved byintroducing a number of virtual constant bonds and constraintpotentials between Au atoms of the core. Additional bonds andconstraint potentials were set for the Au−S interface structurein order to maintain the correct geometry of the NP interior(details given in the Supporting Information).
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