def GBSAGBnForce(solventDielectric=78.5, soluteDielectric=1, SA=None,
cutoff=None, kappa=0.0):
"""
Indexing for tables:
input: radius1, radius2
index = (radius2*200-20)*21 + (radius1*200-20)
output: index of desired value in row-by-row, 1D version of Tables 3 & 4
"""
custom = CustomGBForce()
custom.addPerParticleParameter("q")
custom.addPerParticleParameter("or") # Offset radius
custom.addPerParticleParameter("sr") # Scaled offset radius
custom.addTabulatedFunction("getd0", Continuous2DFunction(21, 21, d0, 0.1, 0.2, 0.1, 0.2))
custom.addTabulatedFunction("getm0", Continuous2DFunction(21, 21, m0, 0.1, 0.2, 0.1, 0.2))
custom.addComputedValue("I", "Ivdw+neckScale*Ineck;"
"Ineck=step(radius1+radius2+neckCut-r)*getm0(radius1,radius2)/(1+100*(r-getd0(radius1,radius2))^2+0.3*1000000*(r-getd0(radius1,radius2))^6);"
"Ivdw=step(r+sr2-or1)*0.5*(1/L-1/U+0.25*(r-sr2^2/r)*(1/(U^2)-1/(L^2))+0.5*log(L/U)/r);"
"U=r+sr2;"
"L=max(or1, D);"
"D=abs(r-sr2);"
"radius1=or1+offset; radius2=or2+offset;"
"neckScale=0.361825; neckCut=0.68; offset=0.009", CustomGBForce.ParticlePairNoExclusions)
custom.addComputedValue("B", "1/(1/or-tanh(1.09511284*psi-1.907992938*psi^2+2.50798245*psi^3)/radius);"
"psi=I*or; radius=or+offset; offset=0.009", CustomGBForce.SingleParticle)
_createEnergyTerms(custom, solventDielectric, soluteDielectric, SA, cutoff, kappa, 0.009)
return custom
def GBSAGBnForce(solventDielectric=78.5, soluteDielectric=1, SA=None,
cutoff=None, kappa=0.0):
"""
Indexing for tables:
input: radius1, radius2
index = (radius2*200-20)*21 + (radius1*200-20)
output: index of desired value in row-by-row, 1D version of Tables 3 & 4
"""
custom = CustomGBForce()
custom.addPerParticleParameter("q")
custom.addPerParticleParameter("or") # Offset radius
custom.addPerParticleParameter("sr") # Scaled offset radius
custom.addTabulatedFunction("getd0", Discrete1DFunction(d0))
custom.addTabulatedFunction("getm0", Discrete1DFunction(m0))
custom.addComputedValue("I", "Ivdw+neckScale*Ineck;"
"Ineck=step(radius1+radius2+neckCut-r)*getm0(index)/(1+100*(r-getd0(index))^2+0.3*1000000*(r-getd0(index))^6);"
"index = (radius2*200-20)*21 + (radius1*200-20);"
"Ivdw=step(r+sr2-or1)*0.5*(1/L-1/U+0.25*(r-sr2^2/r)*(1/(U^2)-1/(L^2))+0.5*log(L/U)/r);"
"U=r+sr2;"
"L=max(or1, D);"
"D=abs(r-sr2);"
"radius1=or1+offset; radius2=or2+offset;"
"neckScale=0.361825; neckCut=0.68; offset=0.009", CustomGBForce.ParticlePairNoExclusions)
custom.addComputedValue("B", "1/(1/or-tanh(1.09511284*psi-1.907992938*psi^2+2.50798245*psi^3)/radius);"
"psi=I*or; radius=or+offset; offset=0.009", CustomGBForce.SingleParticle)
_createEnergyTerms(custom, solventDielectric, soluteDielectric, SA, cutoff, kappa, 0.009)
return custom
def GBSAGBn2Force(solventDielectric=78.5, soluteDielectric=1, SA=None,
cutoff=None, kappa=0.0):
"""
Indexing for tables:
input: radius1, radius2
index = (radius2*200-20)*21 + (radius1*200-20)
output: index of desired value in row-by-row, 1D version of Tables 3 & 4
"""
custom = CustomGBForce()
custom.addPerParticleParameter("q")
custom.addPerParticleParameter("radius")
custom.addPerParticleParameter("scale")
custom.addPerParticleParameter("alpha")
custom.addPerParticleParameter("beta")
custom.addPerParticleParameter("gamma")
if kappa > 0: custom.addGlobalParameter('kappa', kappa)
custom.addGlobalParameter("solventDielectric", solventDielectric)
custom.addGlobalParameter("soluteDielectric", soluteDielectric)
custom.addGlobalParameter("offset", 0.0195141)
custom.addGlobalParameter("neckScale", 0.826836)
custom.addGlobalParameter("neckCut", 0.68)
custom.addTabulatedFunction("getd0", Discrete1DFunction(d0))
custom.addTabulatedFunction("getm0", Discrete1DFunction(m0))
custom.addComputedValue("I", "Ivdw+neckScale*Ineck;"
"Ineck=step(radius1+radius2+neckCut-r)*getm0(index)/(1+100*(r-getd0(index))^2+0.3*1000000*(r-getd0(index))^6);"
"index = (radius2*200-20)*21 + (radius1*200-20);"
"Ivdw=step(r+sr2-or1)*0.5*(1/L-1/U+0.25*(r-sr2^2/r)*(1/(U^2)-1/(L^2))+0.5*log(L/U)/r);"
"U=r+sr2;"
"L=max(or1, D);"
"D=abs(r-sr2);"
"sr2 = scale2*or2;"
"or1 = radius1-offset; or2 = radius2-offset", CustomGBForce.ParticlePairNoExclusions)
custom.addComputedValue("B", "1/(1/or-tanh(alpha*psi-beta*psi^2+gamma*psi^3)/radius);"
"psi=I*or; or=radius-offset", CustomGBForce.SingleParticle)
_createEnergyTerms(custom, SA, cutoff, kappa)
return custom
def GBSAGBn2Force(solventDielectric=78.5,
soluteDielectric=1,
SA=None,
cutoff=None,
kappa=0.0):
"""
Indexing for tables:
input: radius1, radius2
index = (radius2*200-20)*21 + (radius1*200-20)
output: index of desired value in row-by-row, 1D version of Tables 3 & 4
"""
custom = CustomGBForce()
custom.addPerParticleParameter("q")
custom.addPerParticleParameter("or") # Offset radius
custom.addPerParticleParameter("sr") # Scaled offset radius
custom.addPerParticleParameter("alpha")
custom.addPerParticleParameter("beta")
custom.addPerParticleParameter("gamma")
custom.addTabulatedFunction(
"getd0", Continuous2DFunction(21, 21, d0, 0.1, 0.2, 0.1, 0.2))
custom.addTabulatedFunction(
"getm0", Continuous2DFunction(21, 21, m0, 0.1, 0.2, 0.1, 0.2))
custom.addComputedValue(
"I", "Ivdw+neckScale*Ineck;"
"Ineck=step(radius1+radius2+neckCut-r)*getm0(radius1,radius2)/(1+100*(r-getd0(radius1,radius2))^2+0.3*1000000*(r-getd0(radius1,radius2))^6);"
"Ivdw=step(r+sr2-or1)*0.5*(1/L-1/U+0.25*(r-sr2^2/r)*(1/(U^2)-1/(L^2))+0.5*log(L/U)/r);"
"U=r+sr2;"
"L=max(or1, D);"
"D=abs(r-sr2);"
"radius1=or1+offset; radius2=or2+offset;"
"neckScale=0.826836; neckCut=0.68; offset=0.0195141",
CustomGBForce.ParticlePairNoExclusions)
custom.addComputedValue(
"B", "1/(1/or-tanh(alpha*psi-beta*psi^2+gamma*psi^3)/radius);"
"psi=I*or; radius=or+offset; offset=0.0195141",
CustomGBForce.SingleParticle)
_createEnergyTerms(custom, solventDielectric, soluteDielectric, SA, cutoff,
kappa, 0.0195141)
return custom
