def find_closest_o_to_ostar(water_oxys, o_star, hydronium, box, h30_atom_type):
"""
Calculate the minimum distance between a water oxygen and the protonatable oxygen atom closest to the excess proton
@param water_oxys:
@param o_star: the protonatable oxygen atom closest to the excess proton
@param hydronium: the list of atoms in the hydronium, if there is a hydronium
@param box: the dimensions of the periodic box (assumed 90 degree angles)
@param h30_atom_type: (int) lammps type for h30 oxygen atom
@return: the water oxygen (or hydronium oxygen) closest to the o_star, and the distance between them
"""
# initialize smallest distance to the maximum distance in a periodic box
min_dist = np.linalg.norm(np.divide(box, 2))
closest_o = None
if not hydronium:
# initialize minimum distance to maximum distance allowed in the PBC
for wat_o in water_oxys:
dist = pbc_dist(np.asarray(wat_o[XYZ_COORDS]), np.asarray(o_star[XYZ_COORDS]), box)
if dist < min_dist:
min_dist = dist
closest_o = wat_o
else:
for atom in hydronium:
if atom[ATOM_TYPE] == h30_atom_type:
min_dist = pbc_dist(np.asarray(atom[XYZ_COORDS]), np.asarray(o_star[XYZ_COORDS]), box)
closest_o = atom
return closest_o, min_dist
def find_closest_o_to_ostar(water_oxys, o_star, hydronium, box,
h3o_oxy_atom_type):
"""
Calculate the minimum distance between a water oxygen and the protonatable oxygen atom closest to the excess proton
@param water_oxys: list of atom dicts
@param o_star: the protonatable oxygen atom closest to the excess proton
@param hydronium: the list of atoms in the hydronium, if there is a hydronium
@param box: the dimensions of the periodic box (assumed 90 degree angles)
@param h3o_oxy_atom_type: (int) lammps type for h30 oxygen atom
@return: the water oxygen (or hydronium oxygen) closest to the o_star, and the distance between them
"""
# initialize smallest distance to the maximum distance in a periodic box
min_dist = np.linalg.norm(np.divide(box, 2))
closest_o = None
o_star_coord = np.asarray(o_star[XYZ_COORDS])
if not hydronium:
# initialize minimum distance to maximum distance allowed in the PBC
for wat_o in water_oxys:
dist = pbc_dist(np.asarray(wat_o[XYZ_COORDS]), o_star_coord, box)
if dist < min_dist:
min_dist = dist
closest_o = wat_o
else:
for atom in hydronium:
if atom[ATOM_TYPE] == h3o_oxy_atom_type:
min_dist = pbc_dist(np.asarray(atom[XYZ_COORDS]), o_star_coord,
box)
closest_o = atom
return closest_o, min_dist
def find_closest_excess_proton(carboxyl_oxys, prot_h, hydronium, box, cfg):
# initialize minimum distance to maximum distance possible in the periodic box (assume 90 degree corners)
min_dist = np.full(len(carboxyl_oxys), np.linalg.norm(np.divide(box, 2)))
closest_h = {}
alt_dist = np.nan
for index, oxy in enumerate(carboxyl_oxys):
if prot_h is None:
for atom in hydronium:
if atom[ATOM_TYPE] == cfg[H3O_H_TYPE]:
dist = pbc_dist(np.asarray(atom[XYZ_COORDS]), np.asarray(oxy[XYZ_COORDS]), box)
if dist < min_dist[index]:
min_dist[index] = dist
closest_h[index] = atom
else:
min_dist[index] = pbc_dist(np.asarray(prot_h[XYZ_COORDS]), np.asarray(oxy[XYZ_COORDS]), box)
closest_h[index] = prot_h
index_min = np.argmin(min_dist)
min_min = min_dist[index_min]
o_star = carboxyl_oxys[index_min]
excess_proton = closest_h[index_min]
# The distance calculated again below because this will ensure that the 2nd return distance uses the same excess
# proton
for index, oxy in enumerate(carboxyl_oxys):
if index != index_min:
alt_dist = pbc_dist(np.asarray(excess_proton[XYZ_COORDS]), np.asarray(oxy[XYZ_COORDS]), box)
alt_min = np.amin(alt_dist)
return excess_proton, o_star, {OH_MIN: min_min, OH_MAX: alt_min, OH_DIFF: alt_min - min_min}
def atom_distances(rst, atom_pairs):
"""Finds the distance between the each of the atom pairs in the
given LAMMPS dump file.
:param rst: A file in the LAMMPS dump format.
:param atom_pairs: Zero or more pairs of atom IDs to compare.
:returns: Nested dicts keyed by time step, then pair, with the distance as the value.
"""
results = OrderedDict()
flat_ids = set(itertools.chain.from_iterable(atom_pairs))
tstep_atoms, tstep_box = find_atom_data(rst, flat_ids)
for tstep, atoms in tstep_atoms.items():
pair_dist = OrderedDict({FILENAME: os.path.basename(rst)})
for pair in atom_pairs:
try:
row1 = atoms[pair[0]]
row2 = atoms[pair[1]]
pair_dist[pair] = pbc_dist(row1[-3:], row2[-3:],
tstep_box[tstep])
except KeyError as e:
warning(MISSING_TSTEP_ATOM_MSG.format(rst, tstep, e))
return
results[tstep] = pair_dist
return results
def calc_pair_dists(atom_a_list, atom_b_list, box):
dist = np.zeros(len(atom_a_list) * len(atom_b_list))
dist_index = 0
for atom_a in atom_a_list:
for atom_b in atom_b_list:
dist[dist_index] = pbc_dist(np.asarray(atom_a[XYZ_COORDS]), np.asarray(atom_b[XYZ_COORDS]), box)
dist_index += 1
return dist
def calc_pair_dists(atom_a_list, atom_b_list, box):
dist = np.zeros(len(atom_a_list) * len(atom_b_list))
dist_index = 0
for atom_a in atom_a_list:
for atom_b in atom_b_list:
dist[dist_index] = pbc_dist(np.asarray(atom_a[XYZ_COORDS]),
np.asarray(atom_b[XYZ_COORDS]), box)
dist_index += 1
return dist
def find_closest_wat_o_to_hyd_o(water_oxys, hydronium, box, h3o_oxy_atom_type):
"""
Calculate the minimum distance between a water oxygen a hydronium oxygen
@param water_oxys: list of atom dicts
@param hydronium: the list of atoms in the hydronium, if there is a hydronium
@param box: the dimensions of the periodic box (assumed 90 degree angles)
@param h3o_oxy_atom_type: (int) lammps type for h30 oxygen atom
@return: the water oxygen closest to the hydronium oxygen and the distance between them; the hydronium oxygen;
the hydronium hydrogen closes to the water oxygen and the distance between it and the hydronium oxygen
"""
min_oo_dist = np.linalg.norm(np.divide(box, 2))
min_oh_dist = copy.copy(min_oo_dist)
wat_o_hstar_dist = copy.copy(min_oo_dist)
close_wat_o_to_hyd = None
hyd_o = None
hyd_h = []
close_hyd_h_to_wat = None
for atom in hydronium:
if atom[ATOM_TYPE] == h3o_oxy_atom_type:
hyd_o = atom
else:
hyd_h.append(atom)
hyd_o_coords = np.asarray(hyd_o[XYZ_COORDS])
for wat_o in water_oxys:
dist = pbc_dist(np.asarray(wat_o[XYZ_COORDS]), hyd_o_coords, box)
if dist < min_oo_dist:
min_oo_dist = dist
close_wat_o_to_hyd = wat_o
close_wat_o_coords = np.asarray(close_wat_o_to_hyd[XYZ_COORDS])
for h_atom in hyd_h:
# noinspection PyTypeChecker
h_atom_coords = np.asarray(h_atom[XYZ_COORDS])
dist = pbc_dist(h_atom_coords, close_wat_o_coords, box)
if dist < wat_o_hstar_dist:
wat_o_hstar_dist = dist
min_oh_dist = pbc_dist(h_atom_coords, hyd_o_coords, box)
close_hyd_h_to_wat = h_atom
hyd_wat_dict = {
R_OO_HYD_WAT: min_oo_dist,
R_OH_HYD: min_oh_dist,
R_OH_WAT_HYD: wat_o_hstar_dist
}
return hyd_wat_dict, hyd_o, close_hyd_h_to_wat, close_wat_o_to_hyd
def calc_q_arq(r_ao, r_do, r_h, box, r0_sc, r0_da_q, lambda_q):
"""
Calculates the 3-body term, keeping the pbc in mind, per Maupin et al. 2006,
http://pubs.acs.org/doi/pdf/10.1021/jp053596r, equations 7-8
@param r_ao: x,y,z position of the acceptor oxygen (closest water O)
@param r_do: x,y,z position of the donor oxygen (always using the glu oxygen, for now)
@param r_h: x,y,z position of the reactive H
@param box: the dimensions of the periodic box (assumed 90 degree angles)
@param r0_sc: parameter for calc
@param r0_da_q: parameter for calc
@param lambda_q: parameters for calc
@return: the dot-product of the vector q (not the norm, as we need it squared for the next step)
"""
da_dist = pbc_dist(r_do, r_ao, box)
r_sc = r0_sc - lambda_q * (da_dist - r0_da_q)
r_dh = pbc_calc_vector(r_h, r_do, box)
r_da = pbc_calc_vector(r_ao, r_do, box)
q_vec = np.subtract(r_dh, r_sc * r_da / 2.0)
return da_dist, np.dot(q_vec, q_vec)
def deprotonate(cfg, protonatable_res, excess_proton, dump_h3o_mol,
water_mol_dict, box, tpl_data):
"""
Deprotonate a the residue and assign the proton to the closest water
so that the output data matches with the template.
"""
# Convert excess proton to a hydronium proton
excess_proton[1] = tpl_data[H3O_MOL][0][1] # molecule number
excess_proton[2] = cfg[H3O_H_TYPE] # type
excess_proton[3] = tpl_data[H3O_H_CHARGE] # charge
dump_h3o_mol.append(excess_proton)
min_dist_id = None
min_dist = np.linalg.norm(box)
for mol_id, molecule in water_mol_dict.items():
for atom in molecule:
if atom[2] == cfg[WAT_O_TYPE]:
dist = pbc_dist(np.asarray(excess_proton[4:7]),
np.asarray(atom[4:7]), box)
if dist < min_dist:
min_dist_id = mol_id
min_dist = dist
logger.debug('Deprotonated residue: the molecule ID of the closest water '
'(to become a hydronium) is {}.'.format(min_dist_id))
# Now that have the closest water, add its atoms to the hydronium list
for atom in water_mol_dict[min_dist_id]:
dump_h3o_mol.append(atom)
# Remove the closest water from the dictionary of water molecules, and convert it to a hydronium
del water_mol_dict[min_dist_id]
for atom in dump_h3o_mol:
if atom[2] == cfg[WAT_O_TYPE]:
atom[2] = cfg[H3O_O_TYPE]
atom[3] = tpl_data[H3O_O_CHARGE]
elif atom[2] == cfg[WAT_H_TYPE]:
atom[2] = cfg[H3O_H_TYPE]
atom[3] = tpl_data[H3O_H_CHARGE]
# Make the atom type and charge of the protonatable residue the same as for the template file (switching
# from protonated to deprotonated residue)
if len(tpl_data[PROT_RES_MOL]) != len(protonatable_res):
raise InvalidDataError(
'Encountered dump file in which the number of atoms in the '
'protonatable residue does not equal the number of atoms in the template data file.'
)
def deprotonate(cfg, protonatable_res, excess_proton, dump_h3o_mol, water_mol_dict, box, tpl_data):
"""
Deprotonate a the residue and assign the proton to the closest water
so that the output data matches with the template.
"""
# Convert excess proton to a hydronium proton
excess_proton[1] = tpl_data[H3O_MOL][0][1] # molecule number
excess_proton[2] = cfg[H3O_H_TYPE] # type
excess_proton[3] = tpl_data[H3O_H_CHARGE] # charge
dump_h3o_mol.append(excess_proton)
min_dist_id = None
min_dist = np.linalg.norm(box)
for mol_id, molecule in water_mol_dict.items():
for atom in molecule:
if atom[2] == cfg[WAT_O_TYPE]:
dist = pbc_dist(np.asarray(excess_proton[4:7]), np.asarray(atom[4:7]), box)
if dist < min_dist:
min_dist_id = mol_id
min_dist = dist
logger.debug('Deprotonated residue: the molecule ID of the closest water '
'(to become a hydronium) is {}.'.format(min_dist_id))
# Now that have the closest water, add its atoms to the hydronium list
for atom in water_mol_dict[min_dist_id]:
dump_h3o_mol.append(atom)
# Remove the closest water from the dictionary of water molecules, and convert it to a hydronium
del water_mol_dict[min_dist_id]
for atom in dump_h3o_mol:
if atom[2] == cfg[WAT_O_TYPE]:
atom[2] = cfg[H3O_O_TYPE]
atom[3] = tpl_data[H3O_O_CHARGE]
elif atom[2] == cfg[WAT_H_TYPE]:
atom[2] = cfg[H3O_H_TYPE]
atom[3] = tpl_data[H3O_H_CHARGE]
# Make the atom type and charge of the protonatable residue the same as for the template file (switching
# from protonated to deprotonated residue)
if len(tpl_data[PROT_RES_MOL]) != len(protonatable_res):
raise InvalidDataError('Encountered dump file in which the number of atoms in the '
'protonatable residue does not equal the number of atoms in the template data file.')
def calc_more_ocoh_props(box, carboxyl_c_xyz, o_star_xyz, alt_o_xyz,
excess_h_xyz):
"""
If requested and there are xyz coords,
@param box: xyz box size
@param carboxyl_c_xyz:
@param o_star_xyz:
@param alt_o_xyz:
@param excess_h_xyz:
@return: a dict of additional calculated properties
"""
if carboxyl_c_xyz is not None:
# TODO: test that accounts for the case when carboxyl group is broken over the PBC
# does not have be be shown: move c_carbon to the origin; we know the results of moving it and multiplying
# the resulting xyz coords (0, 0, 0) by the COM_WEIGHT_C
c_o_star_vec = pbc_calc_vector(o_star_xyz, carboxyl_c_xyz, box)
c_alt_o_vec = pbc_calc_vector(alt_o_xyz, carboxyl_c_xyz, box)
c_h_star_vec = pbc_calc_vector(excess_h_xyz, carboxyl_c_xyz, box)
o_star_h_vec = pbc_calc_vector(excess_h_xyz, o_star_xyz, box)
com_xyz = COM_WEIGHT_PER_O * c_o_star_vec
com_xyz += COM_WEIGHT_PER_O * c_alt_o_vec
oh_prop_dict = {
COM_H_DIST: pbc_dist(com_xyz, c_h_star_vec, box),
OCO_ANGLE: vec_angle(c_o_star_vec, c_alt_o_vec),
OCOH_DIH: vec_dihedral(c_alt_o_vec, c_o_star_vec, o_star_h_vec),
COM_XYZ: carboxyl_c_xyz + com_xyz
}
else:
oh_prop_dict = {
COM_H_DIST: np.nan,
OCO_ANGLE: np.nan,
OCOH_DIH: np.nan,
COM_XYZ: np.nan
}
return oh_prop_dict
def find_closest_excess_proton(carboxyl_oxys, prot_h, hydronium, box, cfg,
carboxyl_carbon, cec_xyz):
# initialize minimum distance to maximum distance possible in the periodic box (assume 90 degree corners)
oxy_h_min_dists = np.full(len(carboxyl_oxys),
np.linalg.norm(np.divide(box, 2)))
# excess proton will become None if prot_h is none, then calculated
excess_proton = prot_h
for index, oxy in enumerate(carboxyl_oxys):
if prot_h is None:
for atom in hydronium:
if atom[ATOM_TYPE] == cfg[H3O_H_TYPE]:
dist = pbc_dist(np.asarray(atom[XYZ_COORDS]),
np.asarray(oxy[XYZ_COORDS]), box)
if dist < oxy_h_min_dists[index]:
oxy_h_min_dists[index] = dist
excess_proton = atom
else:
oxy_h_min_dists[index] = pbc_dist(np.asarray(prot_h[XYZ_COORDS]),
np.asarray(oxy[XYZ_COORDS]), box)
index_min = np.argmin(oxy_h_min_dists)
o_star = carboxyl_oxys[index_min]
min_oh_dist = oxy_h_min_dists[index_min]
oh_prop_dict = {OH_MIN: min_oh_dist}
if cfg[CALC_OCOH_PROPS] or cfg[CALC_CEC_DIST]:
# the following depends on there being exactly 2 carboxylic oxygen atoms
index_max = abs(index_min - 1)
o_star_xyz = np.asarray(o_star[XYZ_COORDS])
excess_proton_xyz = np.asarray(excess_proton[XYZ_COORDS])
alt_o_xyz = np.asarray(carboxyl_oxys[index_max][XYZ_COORDS])
# distance calculated again to ensure that the 2nd return distance uses the same excess proton
alt_oh_dist = pbc_dist(excess_proton_xyz, alt_o_xyz, box)
oh_prop_dict.update({
OH_MAX: alt_oh_dist,
OH_DIFF: alt_oh_dist - min_oh_dist,
})
if carboxyl_carbon is not None:
carboxyl_c_xyz = np.asarray(carboxyl_carbon[XYZ_COORDS])
oh_prop_dict.update(
calc_more_ocoh_props(box, carboxyl_c_xyz, o_star_xyz,
alt_o_xyz, excess_proton_xyz))
if cfg[CALC_CEC_DIST] and cec_xyz is not None:
cec_o_dists = np.array([
pbc_dist(cec_xyz, o_star_xyz, box),
pbc_dist(cec_xyz, alt_o_xyz, box)
])
oh_prop_dict[CEC_O_MIN] = cec_o_dists.min()
oh_prop_dict[CEC_O_MAX] = cec_o_dists.max()
oh_prop_dict[
CEC_O_DIFF] = oh_prop_dict[CEC_O_MAX] - oh_prop_dict[CEC_O_MIN]
oh_prop_dict[CEC_H_DIST] = pbc_dist(cec_xyz, excess_proton_xyz,
box)
oh_prop_dict[CEC_O_MIN_DIST] = calc_min_dist(
np.array([oh_prop_dict[CEC_O_MIN], oh_prop_dict[CEC_O_MAX]]),
cfg[MIN_DIST_BETA])
if carboxyl_carbon is not None:
oh_prop_dict[CEC_COM_DIST] = pbc_dist(cec_xyz,
oh_prop_dict[COM_XYZ],
box)
return excess_proton, o_star, oh_prop_dict
