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// -*- Mode: C++; tab-width: 2; -*-
// vi: set ts=2:
//
// $Id: reissCavFreeEnergyProcessor.C,v 1.11 2002/02/27 12:24:07 sturm Exp $
#include <BALL/SOLVATION/reissCavFreeEnergyProcessor.h>
#include <BALL/STRUCTURE/numericalSAS.h>
using namespace std;
namespace BALL
{
const char* ReissCavFreeEnergyProcessor::Option::VERBOSITY = "verbosity";
const char* ReissCavFreeEnergyProcessor::Option::SOLVENT_NUMBER_DENSITY
= "solvent_number_density";
const char* ReissCavFreeEnergyProcessor::Option::PRESSURE = "pressure";
const char* ReissCavFreeEnergyProcessor::Option::ABSOLUTE_TEMPERATURE
= "absolute_temperature";
const char* ReissCavFreeEnergyProcessor::Option::PROBE_RADIUS
= "probe_radius";
const int ReissCavFreeEnergyProcessor::Default::VERBOSITY = 0;
const float ReissCavFreeEnergyProcessor::Default::SOLVENT_NUMBER_DENSITY
= 3.33253e-2;
const float ReissCavFreeEnergyProcessor::Default::PRESSURE = 1.01325e5;
const float ReissCavFreeEnergyProcessor::Default::ABSOLUTE_TEMPERATURE
= 298.0;
const float ReissCavFreeEnergyProcessor::Default::PROBE_RADIUS = 1.385;
ReissCavFreeEnergyProcessor::ReissCavFreeEnergyProcessor()
: EnergyProcessor()
{
setDefaultOptions();
valid_ = true;
}
ReissCavFreeEnergyProcessor::ReissCavFreeEnergyProcessor
(const ReissCavFreeEnergyProcessor& proc)
: EnergyProcessor(proc)
{
}
ReissCavFreeEnergyProcessor::~ReissCavFreeEnergyProcessor()
{
clear();
valid_ = false;
}
void ReissCavFreeEnergyProcessor::clear()
{
EnergyProcessor::clear();
setDefaultOptions();
valid_ = true;
}
const ReissCavFreeEnergyProcessor& ReissCavFreeEnergyProcessor::operator = (const ReissCavFreeEnergyProcessor& proc)
{
valid_ = proc.valid_;
energy_ = proc.energy_;
fragment_ = proc.fragment_;
return *this;
}
bool ReissCavFreeEnergyProcessor::operator == (const ReissCavFreeEnergyProcessor& proc) const
{
bool result;
if ((fragment_ == 0) && (proc.fragment_ == 0))
{
result = ((energy_ == proc.energy_) && (valid_ == proc.valid_));
}
else
{
if ((fragment_ == 0) || (proc.fragment_ == 0))
{
result = false;
}
else
{
result = ((*fragment_ == *proc.fragment_)
&& (energy_ == proc.energy_)
&& (valid_ == proc.valid_));
}
}
return result;
}
bool ReissCavFreeEnergyProcessor::finish()
{
// first check for user settings
int verbosity = (int) options.getInteger(Option::VERBOSITY);
// rho is the number density of the solvent (i. e. water) [1/m^3]
double rho = options.getReal(Option::SOLVENT_NUMBER_DENSITY) * 1e30;
// the pressure [ Pa ]
double P = options.getReal(Option::PRESSURE);
// the temperature [ K ]
double T = options.getReal(Option::ABSOLUTE_TEMPERATURE);
// the solvent radius [ A ]
double solvent_radius = options.getReal(Option::PROBE_RADIUS);
if (verbosity > 0)
{
Log.info() << "Using a probe radius of " << solvent_radius << " A" <<
endl;
}
// now compute some constant terms (names as in Pierotti, Chem. Rev.
// 76(6):717--726, 1976)
double sigma1 = 2 * solvent_radius * 1e-10; // [ m ]
double sigma1_2 = sigma1 * sigma1; // [ m^2 ]
double sigma1_3 = sigma1 * sigma1 * sigma1; // [ m^3 ]
double y = Constants::PI * sigma1_3 * (rho/6); // [ 1 ]
double y_frac = y/(1-y); // [ 1 ]
double y_frac_2 = y_frac * y_frac; // [ 1 ]
double NkT = Constants::AVOGADRO * Constants::BOLTZMANN * T; // [ J/mol ]
double NpiP = Constants::AVOGADRO * Constants::PI * P; // [ ? ]
if (verbosity > 0)
{
Log.info() << "y = " << y << endl;
Log.info() << "y_frac = " << y_frac << endl;
}
NumericalSAS sas_computer;
sas_computer.options[NumericalSAS::Option::PROBE_RADIUS ] = solvent_radius;
sas_computer.options[NumericalSAS::Option::COMPUTE_VOLUME] = false;
sas_computer(*fragment_);
HashMap<const Atom*,float> atom_areas = sas_computer.getAtomAreas();
// R is the sum of atom radius and probe radius [ m ]
double R;
// deltaGspher is the cavitatonal energy of a spherical solute [ J/mol ]
double deltaGspher;
// deltaGcav is the cavitatonal energy of the molecule [ J/mol ]
double deltaGcav = 0;
// now iterate over the atoms.
HashMap<const Atom*,float>::Iterator it = atom_areas.begin();
for (; it != atom_areas.end(); ++it)
{
R = it->first->getRadius() * 1e-10 + sigma1 / 2.0;
deltaGspher =
NkT * (-log(1.0 - y) + 4.5 * y_frac_2) - (NpiP * sigma1_3 / 6.0)
- (NkT * ((6.0 * y_frac + 18 * y_frac_2) / sigma1)
+ (NpiP * sigma1_2)) * R
+ (NkT * ((12.0 * y_frac + 18 * y_frac_2) / sigma1_2)
- (2.0 * NpiP * sigma1)) * (R * R)
+ 4.0 / 3.0 * NpiP * (R * R * R);
deltaGcav += it->second * 1e-20 /
( 4 * Constants::PI * R * R ) * deltaGspher;
}
// return energy in units of kJ/mol
energy_ = deltaGcav/1000;
return 1;
}
void ReissCavFreeEnergyProcessor::setDefaultOptions()
{
options.setDefaultInteger(Option::VERBOSITY, Default::VERBOSITY);
options.setDefaultReal(Option::SOLVENT_NUMBER_DENSITY, Default::SOLVENT_NUMBER_DENSITY);
options.setDefaultReal(Option::PRESSURE, Default::PRESSURE);
options.setDefaultReal(Option::ABSOLUTE_TEMPERATURE, Default::ABSOLUTE_TEMPERATURE);
options.setDefaultReal(Option::PROBE_RADIUS, Default::PROBE_RADIUS);
}
} // namespace BALL
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