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planedist.py
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# ----------------------------------------------- #
# Distance between base ring C.o.M. and sugar O4' #
# (see Auffinger and co-workers, 2016) #
# function written by Giovanni Pinamonti #
# SISSA, Trieste, May 2016 #
# ----------------------------------------------- #
import numpy as np
import sys
import mdtraj
atom_name_base='name N1 or name C2 or name N2 or name O2 or name N3 or name C4 or name N4 or name O4 or name C5 or name C6 or name N6 or name O6 or name N7 or name C8 or name N9'
def get_planedist(traj,res1,res2):
top=traj.topology
l_b1=top.select('resid '+str(res1)+' and (name "O4\'")')
l_b2=top.select('resid '+str(res2)+' and ('+atom_name_base+')')
tb1=traj.atom_slice(l_b1)
tb2=traj.atom_slice(l_b2)
pos1=tb1.xyz
pos2=tb2.xyz
d0=[]
natoms1=len(l_b1)
natoms2=len(l_b2)
for iframe in range(len(pos1)):
tmp_CoM1=np.array([sum(pos1[iframe,:,0]),sum(pos1[iframe,:,1]),sum(pos1[iframe,:,2])])/natoms1
tmp_CoM2=np.array([sum(pos2[iframe,:,0]),sum(pos2[iframe,:,1]),sum(pos2[iframe,:,2])])/natoms2
vec_d0=tmp_CoM1-tmp_CoM2
tmp_d0=np.sqrt(sum(vec_d0**2))
d0.append(tmp_d0)
d0=np.array(d0,dtype=np.float32).reshape(len(traj),1)
return d0
def get_omega21(traj,res1,res2):
top=traj.topology
l_nb1=top.select('resid '+str(res1)+' and (name "O4\'")')
# l_nb1=top.select('resid '+str(res1)+' and ('+atom_name_base+')')
l_nb2=top.select('resid '+str(res2)+' and ('+atom_name_base+')')
tnb1=traj.atom_slice(l_nb1)
tnb2=traj.atom_slice(l_nb2)
#resname2=tnb2.top.residue(res2).name
resname2=top.residue(0).name
if resname2=='A':
l_C8_2=tnb2.top.select('name C8')
l_N6_2=tnb2.top.select('name N6')
if resname2=='G':
l_C8_2=tnb2.top.select('name C8')
l_N6_2=tnb2.top.select('name O6')
if resname2=='C':
l_C8_2=tnb2.top.select('name O2')
l_N6_2=tnb2.top.select('name N4')
if resname2=='U':
l_C8_2=tnb2.top.select('name O2')
l_N6_2=tnb2.top.select('name O4')
pos1=tnb1.xyz
pos2=tnb2.xyz
omegas=[]
natoms1=tnb1.n_atoms
natoms2=tnb2.n_atoms
a2s=tnb2.atom_slice(l_C8_2).xyz
b2s=tnb2.atom_slice(l_N6_2).xyz
for iframe in range(len(traj)):
CoM1=np.array([sum(pos1[iframe,:,0]),sum(pos1[iframe,:,1]),sum(pos1[iframe,:,2])])/natoms1
CoM2=np.array([sum(pos2[iframe,:,0]),sum(pos2[iframe,:,1]),sum(pos2[iframe,:,2])])/natoms2
d0=CoM1-CoM2
a2=a2s[iframe,0,:]-CoM2
b2=b2s[iframe,0,:]-CoM2
c2=np.cross(a2,b2)
len_c2=np.sqrt(sum(c2**2))
len_d0=np.sqrt(sum(d0**2))
omega=np.arccos(np.dot(c2,d0)/(len_c2*len_d0))
omegas.append(omega)
omegas=np.array(omegas,dtype=np.float32).reshape(len(traj),1)
return omegas
def get_stack_score(traj,res1,res2):
top=traj.topology
l_nb1=top.select('resid '+str(res1)+' and (name "O4\'")')
# l_nb1=top.select('resid '+str(res1)+' and ('+atom_name_base+')')
l_nb2=top.select('resid '+str(res2)+' and ('+atom_name_base+')')
tnb1=traj.atom_slice(l_nb1)
tnb2=traj.atom_slice(l_nb2)
pos1=tnb1.xyz
pos2=tnb2.xyz
score=[]
natoms1=tnb1.n_atoms
natoms2=tnb2.n_atoms
# resname1=tnb1.top.residue(0).name
# if resname1=='A':
# l_C8_1=tnb1.top.select('name C8')
# l_N6_1=tnb1.top.select('name N6')
# if resname1=='G':
# l_C8_1=tnb1.top.select('name C8')
# l_N6_1=tnb1.top.select('name O6')
# if resname1=='C':
# l_C8_1=tnb1.top.select('name O2')
# l_N6_1=tnb1.top.select('name N4')
# if resname1=='U':
# l_C8_1=tnb1.top.select('name O2')
# l_N6_1=tnb1.top.select('name O4')
resname2=tnb2.top.residue(0).name
if resname2=='A':
l_C8_2=tnb2.top.select('name C8')
l_N6_2=tnb2.top.select('name N6')
if resname2=='G':
l_C8_2=tnb2.top.select('name C8')
l_N6_2=tnb2.top.select('name O6')
if resname2=='C':
l_C8_2=tnb2.top.select('name O2')
l_N6_2=tnb2.top.select('name N4')
if resname2=='U':
l_C8_2=tnb2.top.select('name O2')
l_N6_2=tnb2.top.select('name O4')
a2s=tnb2.atom_slice(l_C8_2).xyz
b2s=tnb2.atom_slice(l_N6_2).xyz
# a1s=tnb1.atom_slice(l_C8_1).xyz
# b1s=tnb1.atom_slice(l_N6_1).xyz
for iframe in range(len(pos1)):
#compute d0
CoM1=np.array([sum(pos1[iframe,:,0]),sum(pos1[iframe,:,1]),sum(pos1[iframe,:,2])])/natoms1
CoM2=np.array([sum(pos2[iframe,:,0]),sum(pos2[iframe,:,1]),sum(pos2[iframe,:,2])])/natoms2
d0=CoM1-CoM2
len_d0=np.sqrt(sum(d0**2))
#compute omega21
a2=a2s[iframe,0,:]-CoM2
b2=b2s[iframe,0,:]-CoM2
c2=np.cross(a2,b2)
len_c2=np.sqrt(sum(c2**2))
omega=np.arccos(np.dot(c2,d0)/(len_c2*len_d0))*180/np.pi
# #compute chi
# a1=a1s[iframe,0,:]-CoM1
# b1=b1s[iframe,0,:]-CoM1
# c1=np.cross(a1,b1)
# len_c1=np.sqrt(sum(c1**2))
# chi=np.arccos(np.dot(c1,c2)/(len_c1*len_c2))*180/np.pi
#now compute the score:
#d0
if len_d0<=0.35:
tmp_score=1
# elif len_d0 <=0.5:
#tmp_score=(0.5-len_d0)/0.15
#tmp_score=(0.5-len_d0)**3/0.15**3
# A=0.065258752
# tmp_score=A/(len_d0**3)-8*A
else:
score.append(0)
continue
#omega
if omega<=25 or omega>=155:
tmp_score+=1
elif omega<=50:
tmp_score+=(50-omega)/25
elif omega>=130:
tmp_score+=(omega-130)/25
else:
score.append(0)
continue
# #chi
# if chi>45 and chi<135:
# tmp_score*=-1
#append final score
score.append(tmp_score)
score=np.array(score,dtype=np.float32).reshape(len(traj),1)
return score