def biopython_protein_analysis(inseq):
"""Utiize Biopython's ProteinAnalysis module to return general sequence properties of an amino acid string.
For full definitions see: http://biopython.org/DIST/docs/api/Bio.SeqUtils.ProtParam.ProteinAnalysis-class.html
Args:
inseq: Amino acid sequence
Returns:
dict: Dictionary of sequence properties. Some definitions include:
instability_index: Any value above 40 means the protein is unstable (has a short half life).
secondary_structure_fraction: Percentage of protein in helix, turn or sheet
TODO:
Finish definitions of dictionary
"""
inseq = ssbio.protein.sequence.utils.cast_to_str(inseq)
analysed_seq = ProteinAnalysis(inseq)
info_dict = {}
info_dict['amino_acids_content-biop'] = analysed_seq.count_amino_acids()
info_dict[
'amino_acids_percent-biop'] = analysed_seq.get_amino_acids_percent()
info_dict['length-biop'] = analysed_seq.length
info_dict['monoisotopic-biop'] = analysed_seq.monoisotopic
info_dict['molecular_weight-biop'] = analysed_seq.molecular_weight()
info_dict['aromaticity-biop'] = analysed_seq.aromaticity()
info_dict['instability_index-biop'] = analysed_seq.instability_index()
# TODO: What is flexibility?
info_dict['flexibility-biop'] = analysed_seq.flexibility()
info_dict['isoelectric_point-biop'] = analysed_seq.isoelectric_point()
# grand average of hydrophobicity
info_dict['gravy-biop'] = analysed_seq.gravy()
# Separated secondary_structure_fraction into each definition
# info_dict['secondary_structure_fraction-biop'] = analysed_seq.secondary_structure_fraction()
info_dict[
'percent_helix_naive-biop'] = analysed_seq.secondary_structure_fraction(
)[0]
info_dict[
'percent_turn_naive-biop'] = analysed_seq.secondary_structure_fraction(
)[1]
info_dict[
'percent_strand_naive-biop'] = analysed_seq.secondary_structure_fraction(
)[2]
return info_dict
def phyChemProps(seq):
svv = [0 for x in range(10)]
X = ProteinAnalysis(seq)
svv[0] = X.aromaticity()
svv[1] = X.secondary_structure_fraction()[0]
svv[2] = X.secondary_structure_fraction()[1]
svv[3] = X.secondary_structure_fraction()[2]
svv[4] = X.gravy()
svv[5] = X.instability_index()
svv[6] = X.isoelectric_point()
svv[7] = X.molecular_weight()
svv[8] = X.molar_extinction_coefficient()[0]
svv[9] = X.molar_extinction_coefficient()[1]
return svv
def calculate_physiochemical_features(temp_dict, sequence):
analyzed_seq = ProteinAnalysis(sequence)
charge_at_pH7 = analyzed_seq.charge_at_pH(7)
instability_index = analyzed_seq.instability_index()
molecular_weight = analyzed_seq.molecular_weight()
aromaticity = analyzed_seq.aromaticity()
molar_extinction_coefficient = analyzed_seq.molar_extinction_coefficient()
range_l, range_h = molar_extinction_coefficient
molar_extinction_coefficient = (float(range_l) + float(range_h)) / 2
gravy = analyzed_seq.gravy(
) #Grand Average Hyrdopathy - Higher value = More Hydrophobic
isoelectric_point = analyzed_seq.isoelectric_point()
helix_fraction, turn_fraction, sheet_fraction = analyzed_seq.secondary_structure_fraction(
)
physiochem_dict = {
"Charge at pH7": charge_at_pH7,
"Instability Index": instability_index,
"Molecular Wt": molecular_weight,
"Aromaticity": aromaticity,
"Molar Extinction Coeff": molar_extinction_coefficient,
"Gravy": gravy,
"Isoelectric pt": isoelectric_point,
"Helix Fraction": helix_fraction,
"Turn Fraction": turn_fraction,
"Sheet Fraction": sheet_fraction
}
temp_dict.update(physiochem_dict)
#Adding separately because get_amino_acids_percent() generates a dictionary on its own
aa_percent = analyzed_seq.get_amino_acids_percent()
temp_dict.update(aa_percent)
def protAnalysis(self, content):
result, resultFlexDic = dict(), dict()
content = Parsers.normalizeSequence(content, self.sourceType)
protein = ProteinAnalysis(content)
result['proteinMWeight'] = protein.molecular_weight()
result['proteinAroma'] = protein.aromaticity()
result['proteinInstab'] = protein.instability_index()
result['proteinIsoelec'] = protein.isoelectric_point()
result['proteinGravy'] = protein.gravy()
proteinStructure = protein.secondary_structure_fraction()
protStruct = self.flatten('proteinSecstruc', proteinStructure)
result = {**protStruct, **result}
# merge result and protein Structure
flexibility = protein.flexibility()
flexibFlat = self.flatten('proteinFlex', flexibility)
flexibAmino = self.flatten(list(content), flexibility)
flattened = {**flexibFlat, **result}
flattenedFlexDic = {**flexibAmino, **result}
return result, flattened, flattenedFlexDic,
def prot_param_features(seq):
features = {}
pa = ProteinAnalysis(str(seq.seq)) # .replace('X','G').replace('B','A')
# 1. Amino Acid Percent
aa = pa.get_amino_acids_percent()
aa_dict = {"frac_{}".format(k): v for k, v in aa.items()}
features.update(aa_dict)
# 2. Aromaticity
features["aromaticity"] = pa.aromaticity()
# 3. Isoelectric Point
features["isoelectric"] = pa.isoelectric_point()
# 4. Molecular Weight
try:
features["mol_weight"] = pa.molecular_weight()
except ValueError:
replaced = str(seq.seq).replace('X', 'G').replace('B', 'N')
# 5. Flexibility
# try:
# features["flexibility"] = np.mean(pa.flexibility())
# except KeyError:
# replaced = str(seq.seq).replace('X', 'G').replace('B', 'N').replace('U','C')
# features["flexibility"] = np.mean(ProteinAnalysis(replaced).flexibility())
# 6. Secondary Structure Fraction
struc = ["struc_helix", "struc_turn", "struc_sheet"]
ss = pa.secondary_structure_fraction()
features.update(dict(zip(struc, ss)))
return features
def _protein_parameters(self, sequence):
"""Calculates physicochemical properties for the amino acid sequence.
Args:
sequence: str, amino acid sequence.
Returns:
property_arr: np array, vector of properties.
"""
analysis = ProteinAnalysis(sequence)
property_arr = []
property_arr.append(analysis.molecular_weight())
property_arr.append(analysis.aromaticity())
property_arr.append(analysis.instability_index())
property_arr.append(analysis.gravy())
property_arr.append(analysis.isoelectric_point())
secondary = analysis.secondary_structure_fraction()
property_arr.append(secondary[0])
property_arr.append(secondary[1])
property_arr.append(secondary[2])
molar_extinction_coefficient = analysis.molar_extinction_coefficient()
property_arr.append(molar_extinction_coefficient[0])
property_arr.append(molar_extinction_coefficient[1])
property_arr.append(self._net_charge(sequence))
return np.array(property_arr)
def get_secondary_structure(self):
x = ProteinAnalysis(self.sequence)
sec_stru = x.secondary_structure_fraction()
helix = "{0:0.2f}".format(sec_stru[0])
turn = "{0:0.2f}".format(sec_stru[1])
sheet = "{0:0.2f}".format(sec_stru[2])
return helix, turn, sheet
def get_sec_struct(self):
"""
Calculates the fraction of amino acids which tend to be in helix, turn or sheet (3 value) from biopython
:return: dictionary with the 3 value of helix, turn, sheet
"""
res = {}
analysed_seq = ProteinAnalysis(self.ProteinSequence)
res['SecStruct_helix'] = analysed_seq.secondary_structure_fraction()[
0] # helix
res['SecStruct_turn'] = analysed_seq.secondary_structure_fraction()[
1] # turn
res['SecStruct_sheet'] = analysed_seq.secondary_structure_fraction()[
2] # sheet
return res
def get_protein_features(seq):
seq = correct(seq)
prot_analysis = ProteinAnalysis(seq)
prot_weight = molecular_weight(seq)
pI = prot_analysis.isoelectric_point()
aa_count = prot_analysis.count_amino_acids()
neg_charged_residues = aa_count['D'] + aa_count['E']
pos_charged_residues = aa_count['K'] + aa_count['R']
extinction_coefficient_1 = aa_count['Y'] * 1490 + aa_count['W'] * 5500
extinction_coefficient_2 = aa_count['Y'] * 1490 + aa_count[
'W'] * 5500 + aa_count['C'] * 125
instability_idx = instability_index(seq)
gravy = hydrophobicity(seq)
secondary_structure_fraction = [
frac for frac in prot_analysis.secondary_structure_fraction()
]
names = [
'length', 'weight', 'pI', 'neg_charged_residues',
'pos_charged_residues', 'extinction_coeff1', 'extinction_coeff2',
'instability_index', 'gravy', 'helix', 'turn', 'sheet'
]
return names, [
len(seq), prot_weight, pI, neg_charged_residues, pos_charged_residues,
extinction_coefficient_1, extinction_coefficient_2, instability_idx,
gravy, *secondary_structure_fraction
]
def protein_analysis():
if session.username == None:
redirect(URL(r=request, c='account', f='log_in'))
from Bio.SeqUtils.ProtParam import ProteinAnalysis
form = FORM(
TABLE(
TR(
"Amino acid sequence: ",
TEXTAREA(_type="text",
_name="sequence",
requires=IS_NOT_EMPTY())),
INPUT(_type="submit", _value="SUBMIT")))
if form.accepts(request.vars, session):
session['sequence'] = seqClean(form.vars.sequence.upper())
X = ProteinAnalysis(session['sequence'])
session['aa_count'] = X.count_amino_acids()
session['percent_aa'] = X.get_amino_acids_percent()
session['mw'] = X.molecular_weight()
session['aromaticity'] = X.aromaticity()
session['instability'] = X.instability_index()
session['flexibility'] = X.flexibility()
session['pI'] = X.isoelectric_point()
session['sec_struct'] = X.secondary_structure_fraction()
redirect(URL(r=request, f='protein_analysis_output'))
return dict(form=form)
def get_protein_analysis(aa):
protein_analysis = ProteinAnalysis(aa)
analyze = [protein_analysis.molecular_weight(),
protein_analysis.aromaticity(),
protein_analysis.instability_index(),
protein_analysis.isoelectric_point(),
protein_analysis.gravy()] + list(
protein_analysis.secondary_structure_fraction())
return analyze
def secondary_structure(self, record):
'''
Input:
- record: a SeqRecord
Output:
- tuple of integers
'''
PA = ProteinAnalysis(str(record.seq))
return PA.secondary_structure_fraction()
def get_biopython_features(X):
res = np.zeros((X.shape[0], 6))
for i, seq in enumerate(X):
analysed_seq = ProteinAnalysis(seq)
res[i] = np.array([analysed_seq.molecular_weight()] +
[analysed_seq.instability_index()] +
[analysed_seq.isoelectric_point()] +
list(analysed_seq.secondary_structure_fraction()))
return res
def processSeq(seq):
''' Protein features found:
- Sequence Length
- Amino Acid Composition (global)
- Amino Acid Composition (First 50/Last 50)
- Isoelectric Point
- Aromacity
- Grand Average Hydropathy (Gravy)
- Molecular Weight (global)
- Molecular Weight (First 50/Last 50)
- Secondary Structure Fraction
'''
# seq = str(seq_record.seq)
prot = ProteinAnalysis(seq)
# desc = str(seq_record.description).split('_')
# species = desc[1].split(' ')[0]
seq_length = len(seq)
isoelectric = prot.isoelectric_point()
gravy = calculateGravy(seq, 0, seq_length)
aroma = prot.aromaticity()
ss_frac = prot.secondary_structure_fraction()
mol_global_weight = calculateMolecularWeight(seq, 0, seq_length)
AA_global_dist = getAAPercent(seq, 0, seq_length)
flex_global = calculateFlexibility(seq, 0, seq_length)
if (seq_length > 50):
AA_local_head = getAAPercent(seq, 0, 50)
AA_local_tail = getAAPercent(seq, seq_length - 50, seq_length)
mol_local_weight_head = calculateMolecularWeight(seq, 0, 50)
mol_local_weight_tail = calculateMolecularWeight(
seq, seq_length - 50, seq_length)
flex_localh = calculateFlexibility(seq, 0, 50)
flex_localt = calculateFlexibility(seq, seq_length - 50, seq_length)
else:
AA_local_head = AA_global_dist
AA_local_tail = AA_global_dist
mol_local_weight_head = mol_global_weight
mol_local_weight_tail = mol_global_weight
flex_localh = flex_global
flex_localt = flex_global
return_vector = [seq_length,aroma,
isoelectric,
mol_global_weight,
mol_local_weight_head,
mol_local_weight_tail,
gravy,flex_global,
flex_localh,
flex_localt] + \
AA_global_dist + AA_local_head + AA_local_tail + list(ss_frac)
# print seq_length, GC_distribution, mol_weight, aroma, isoelectric
return return_vector
def make_dataset(fasta):
# a list of dictionaries containing features for all sequences
ls_features = []
# assign whether it's from tardigrades 'tar' or poplars 'pop'
if 'tar' in fasta:
target = 0
elif 'pop' in fasta:
target = 1
for record in SeqIO.parse(fasta, "fasta"):
analysed_seq = ProteinAnalysis(str(record.seq))
# the dictionary containing features for a single sequence
dict_features = {}
# compute length
dict_features['length'] = len(record.seq)
# compute molecular weight
dict_features['mol_weight'] = analysed_seq.molecular_weight()
# compute aromaticity
dict_features['aromaticity'] = analysed_seq.molecular_weight()
# compute stability
dict_features['stability'] = analysed_seq.instability_index()
# compute flexibility
dict_features['flexibility'] = analysed_seq.flexibility()
# compute isoelectric point
dict_features['isoelectric'] = analysed_seq.isoelectric_point()
# compute secondary structure fraction
frac = analysed_seq.secondary_structure_fraction()
dict_features['helix'] = frac[0]
dict_features['turn'] = frac[1]
dict_features['sheet'] = frac[2]
# compute AAC composition of entire sequence
aac = analysed_seq.get_amino_acids_percent()
# merge all features and dictionaries into dict_features
dict_features.update(aac)
ls_features += [dict_features]
df = pd.DataFrame(ls_features)
df['target'] = target
print(df)
df.to_pickle(name + '_set.pkl')
def find_composition(df_original):
df_copy = df_original.copy()
column_names = []
for ch in codes:
column_names.append(ch + '_percent')
column_names.append(ch + '_percent_first')
column_names.append(ch + '_percent_last')
column_names.append('len')
column_names.append('weight')
column_names.append('gravy')
column_names.append('flex_mean')
column_names.append('flex_std')
column_names.append('ss_helix')
column_names.append('ss_turn')
column_names.append('ss_sheet')
column_names.append('iep')
column_names.append('aromaticity')
df = pd.DataFrame(columns=column_names)
for _, seq in enumerate(tqdm(df_copy['seq'])):
df_temp = pd.Series()
sequence = str(seq)
analysed = ProteinAnalysis(sequence)
analysed_first = ProteinAnalysis(sequence[:first_n])
analysed_last = ProteinAnalysis(sequence[-last_n:])
df_temp['len'] = analysed.length
df_temp['ss_helix'], df_temp['ss_turn'], df_temp['ss_sheet'] = analysed.secondary_structure_fraction()
df_temp['iep'] = analysed.isoelectric_point()
# overall
for aa, percent in analysed.get_amino_acids_percent().items():
df_temp[aa + '_percent'] = percent
# # first N
for aa, percent in analysed_first.get_amino_acids_percent().items():
df_temp[aa + '_percent_first'] = percent
# last N
for aa, percent in analysed_last.get_amino_acids_percent().items():
df_temp[aa + '_percent_last'] = percent
df_temp['weight'] = analysed.molecular_weight()
df_temp['gravy'] = analysed.gravy()
df_temp['aromaticity'] = analysed.aromaticity()
df_temp['flex_mean'] = np.mean(analysed.flexibility())
df_temp['flex_std'] = np.std(analysed.flexibility())
df = df.append(df_temp, ignore_index=True)
return pd.concat([df_copy, df], axis=1)
def get_structure_perc(seq, structure="helix"):
"""
"""
bio_seq = ProteinAnalysis(seq)
helix, turn, sheets = bio_seq.secondary_structure_fraction()
if structure == "helix":
return (helix)
elif structure == "turn":
return (turn)
else:
return (sheets)
def bio_feat(record):
clean_seq = str(MutableSeq(record.seq)).replace("X", "")
clean_seq = clean_seq.replace("U", "C")
clean_seq = clean_seq.replace("B", "N")
clean_seq = clean_seq.replace('Z', 'Q')
clean_seq = MutableSeq(clean_seq).toseq()
### features
seq_length = len(str(clean_seq))
analysed_seq = ProteinAnalysis(str(clean_seq))
molecular_weight = analysed_seq.molecular_weight()
amino_percent = analysed_seq.get_amino_acids_percent().values()
isoelectric_points = analysed_seq.isoelectric_point()
count = analysed_seq.count_amino_acids().values()
# aromaticity = analysed_seq.aromaticity()
instability_index = analysed_seq.instability_index()
# hydrophobicity = analysed_seq.protein_scale(ProtParamData.kd, 5, 0.4)
secondary_structure_fraction = analysed_seq.secondary_structure_fraction()
return np.array([seq_length, molecular_weight, isoelectric_points, instability_index] + list(secondary_structure_fraction) + list(count) + list(amino_percent))
def protein_analysis():
if session.username == None: redirect(URL(r=request,f='../account/log_in'))
from Bio.SeqUtils.ProtParam import ProteinAnalysis
form = FORM(TABLE(
TR("Amino acid sequence: ",
TEXTAREA(_type="text", _name="sequence",
requires=IS_NOT_EMPTY())),
INPUT(_type="submit", _value="SUBMIT")))
if form.accepts(request.vars,session):
session['sequence'] = seqClean(form.vars.sequence.upper())
X = ProteinAnalysis(session['sequence'])
session['aa_count'] = X.count_amino_acids()
session['percent_aa'] = X.get_amino_acids_percent()
session['mw'] = X.molecular_weight()
session['aromaticity'] = X.aromaticity()
session['instability'] = X.instability_index()
session['flexibility'] = X.flexibility()
session['pI'] = X.isoelectric_point()
session['sec_struct'] = X.secondary_structure_fraction()
redirect(URL(r=request, f='protein_analysis_output'))
return dict(form=form)
def get_features(seq):
"""get global features from a protein sequence
Parameters
----------
seq : str
protein sequence
Return
----------
dictionary:
global features of the protein sequence
"""
features = {}
features['undefined_count'] = len([x for x in seq if x in ['X','B','Z',"'",'O','U']])
features['length'] = len(seq)
features['perc_undefined_count'] = features['undefined_count']/features['length']
features['entropy'] = entropy(seq)
features['ideal_entropy'] = entropy_ideal(len(seq))
features['perc_entropy'] = features['entropy']/features['ideal_entropy']
features['hydr_count'] = sum(1 for x in seq if x in hydrophobic_proteins)
features['polar_count'] = sum(1 for x in seq if x in polar_proteins)
features['buried'] = sum(buried[x] for x in seq if x in hydrophobic_proteins)
seq = ''.join([x for x in seq if x not in ['X','B','Z',"'",'O','U']])
protein = ProteinAnalysis(seq)
features['gravy'] = protein.gravy()
features['molecular_weight'] = protein.molecular_weight()
features['aromaticity'] = protein.aromaticity()
features['instability_index'] = protein.instability_index()
features['isoelectric_point'] = protein.isoelectric_point()
features['helix'], features['turn'], features['sheet'] = protein.secondary_structure_fraction()
features.update(protein.count_amino_acids())
# features.update(protein.get_amino_acids_percent())
return features
def GetFeatures (My_seq):
Features = {}
ProteinAnalysis(My_seq)
analysed_seq = ProteinAnalysis(My_seq)
#Caracteristicas monovaloradas
Features["Molecular_weight"] = analysed_seq.molecular_weight()
Features["Aromaticity"] = analysed_seq.aromaticity()
Features["Instability_index"] = analysed_seq.instability_index()
Features["Isoelectric_point"] = analysed_seq.isoelectric_point()
#Caracteristicas multivaloradas
Features["Flexibility"] = analysed_seq.flexibility() # List 580
Features["Second_structure_fraction"] = analysed_seq.secondary_structure_fraction() #3 Tupla
Features["Count_amino_acids"] = analysed_seq.count_amino_acids() #20 Dict
Features["Amino_acids_percent"] = analysed_seq.get_amino_acids_percent() #20 Dict
return Features
def seqs_to_features(self, seqs, no_seqs):
""" Extract the features from the sequences."""
X = np.zeros((no_seqs, 32))
for i, s in enumerate(chain(*seqs)): # iterate over all sequences
# get amino acid counts
alphabet = 'ABCDEFGHIKLMNPQRSTUVWXY' # no JOZ
for j, letter in enumerate(alphabet):
X[i, j] = s.count(letter) / len(s)
# other analysis
analysis = ProteinAnalysis(
s.replace('X', 'A').replace('B', 'A').replace('U', 'A'))
X[i, -1] = analysis.molecular_weight()
X[i, -2] = analysis.aromaticity()
X[i, -3] = analysis.instability_index()
X[i, -4] = analysis.isoelectric_point()
helix_array_sheet_fracs = analysis.secondary_structure_fraction()
X[i, -5] = helix_array_sheet_fracs[0]
X[i, -6] = helix_array_sheet_fracs[1]
X[i, -7] = helix_array_sheet_fracs[2]
X[i, -8] = len(s)
X[i, -9] = analysis.gravy() # mean hydrophobicity
return X
def physchem_props(ara_d):
"""Calculate the physicochemical properties per protein in ara_d."""
c = 0
g = 0
for protein in ara_d:
seq = ara_d[protein]["sequence"]
# Calculates the properties
if "X" in seq:
continue # Skip non-usable sequences, only negs
if '*' in seq:
if ara_d[protein]["pos"] != []:
print(protein)
continue
a_seq = ProteinAnalysis(seq)
# Update ara_d with new physchem properties
results = [
a_seq.molecular_weight(),
a_seq.gravy(),
a_seq.aromaticity(),
a_seq.instability_index(),
a_seq.flexibility(),
a_seq.isoelectric_point(),
a_seq.secondary_structure_fraction(),
]
keys = [
"mol_weight",
"gravy",
"aromaticity",
"instab_index",
"flexi",
"iso_point",
"seq_struct",
]
ara_d[protein]["Properties"] = {}
for k, v in zip(keys, results):
ara_d[protein]["Properties"][k] = v
return ara_d
def add_protein_characteristics(df):
df = df.copy()
aa_list = [
'A', 'C', 'E', 'D', 'G', 'F', 'I', 'H', 'K', 'M', 'L', 'N', 'Q', 'P',
'S', 'R', 'T', 'W', 'V', 'Y'
]
aa_dict = {}
for aa in aa_list:
aa_dict[aa] = []
prop_dict = {
'aromaticity': [],
'helix': [],
'turn': [],
'sheet': [],
'isoelectric_point': [],
'gravy': []
} #, 'flexibility': [], 'instability_index': []}
for i, s in enumerate(df['sequence']):
s = s.replace('B', 'D').replace('Z', 'E').replace('J', 'L').replace(
'X', 'G').replace('U', 'C').replace('O', 'K')
pa = ProteinAnalysis(s)
prop_dict['aromaticity'].append(pa.aromaticity())
prop_dict['isoelectric_point'].append(pa.isoelectric_point())
prop_dict['gravy'].append(pa.gravy())
# prop_dict['instability_index'].append(pa.instability_index())
# prop_dict['flexibility'].append(np.mean(pa.flexibility()))
for fraction, ss in zip(pa.secondary_structure_fraction(),
['helix', 'turn', 'sheet']):
prop_dict[ss].append(fraction)
for k, v in pa.get_amino_acids_percent().items():
aa_dict[k].append(v)
for k, v in aa_dict.items():
df[k] = v
for k, v in prop_dict.items():
df[k] = v
return df
def biopython_proteinanalysis_seq(seq, scaling=False):
res = ProteinAnalysis(seq)
d = {}
flex = np.array(res.flexibility())
d['flex:min'], d['flex:max'], d['flex:std'] = flex.min(), flex.max(
), flex.std()
d['gravy'] = res.gravy()
d['instability_index'] = res.instability_index()
d['isoelectric_point'] = res.isoelectric_point()
r, c = res.molar_extinction_coefficient()
d['molar_extinction_coefficient_reduced'], d[
'molar_extinction_coefficient_cysteines'] = r, c
d['molecular_weight'] = res.molecular_weight()
d['percent_helix_naive'], d['percent_turn_naive'], d[
'percent_strand_naive'] = res.secondary_structure_fraction()
aap = res.get_amino_acids_percent()
aas = sorted(aap.keys())
d.update({'percent:%s' % aa: aap[aa] for aa in aas})
d.update({
'prop_res_%s' % key: sum([aap.get(x, 0) for x in value])
for key, value in list(property_residues.items())
})
return d
def openfile():
global prob, probab, te
global my_seq
global anti
global structure, structure_id, filename
global antigenicity, hydro, flex, sec
global m, a, c, b, length, j, k
global hydroph, flexi, access
anti = []
sec = []
probab = []
from tkinter import filedialog
root = Tk()
root.filename = filedialog.askopenfilename(
initialdir="/",
title="Select file",
filetypes=(("pdb files", "*.pdb"), ("pdb files", "*.pdb")))
filename = root.filename
print(filename)
structure_id = "1e6j"
structure = PDBParser().get_structure(structure_id, root.filename)
ppb = PPBuilder()
for pp in ppb.build_peptides(structure):
my_seq = pp.get_sequence() # type: Seq
print(my_seq)
for model in structure:
for chain in model:
print(chain)
sequence = list(my_seq)
m = ''.join(sequence)
print(m)
length = len(m) # type: int
print("Sequence consist of", length, "Amino Acids")
from Bio.SeqUtils.ProtParam import ProteinAnalysis
analysed_seq = ProteinAnalysis(m)
print("Molecular weight = ", analysed_seq.molecular_weight())
print("Amino Acid Count = ", analysed_seq.count_amino_acids())
print("Secondary structure fraction =",
analysed_seq.secondary_structure_fraction())
kd = {
'A': 1.8,
'R': -4.5,
'N': -3.5,
'D': -3.5,
'C': 2.5,
'Q': -3.5,
'E': -3.5,
'G': -0.4,
'H': -3.2,
'I': 4.5,
'L': 3.8,
'K': -3.9,
'M': 1.9,
'F': 2.8,
'P': -1.6,
'S': -0.8,
'T': -0.7,
'W': -0.9,
'Y': -1.3,
'V': 4.2
}
c = list(analysed_seq.flexibility())
b = list(analysed_seq.protein_scale(kd, 10, 1.0))
hydro = list(analysed_seq.protein_scale(kd, 10, 1.0))
flex = list(analysed_seq.flexibility())
hydroph = list(analysed_seq.protein_scale(kd, 10, 1.0))
flexi = list(analysed_seq.flexibility())
i = 1
j = -1 # type: int
k = 9
while i <= (length - 10):
print("Sequence is = ", m[j + 1:k + 1])
print("Flexibility value = ", c[j + 1])
print("Hydrophilicity value = ", b[j + 1])
ana_seq = ''.join(m[j + 1:k + 1])
analyze_seq = ProteinAnalysis(ana_seq)
# For Secondary structure Analysis
print("Secondary structure fraction =",
analyze_seq.secondary_structure_fraction())
a = list(analyze_seq.secondary_structure_fraction())
a = a[0]
sec.append(a)
i += 1
j += 1
k += 1
f = length
r = 1
y = 10
global acc, logacc
acc = []
for i in range(0, f):
str1 = "accessibility, resi "
str2 = str(r) + "-" + str(y)
saving = str1 + str2
print(saving)
r = r + 1
y = y + 1
structure = freesasa.Structure("1e6j.pdb")
resulta = freesasa.calc(structure)
area_classes = freesasa.classifyResults(resulta, structure)
print("Total : %.2f A2" % resulta.totalArea())
for key in area_classes:
print(key, ": %.2f A2" % area_classes[key])
resulta = freesasa.calc(
structure,
freesasa.Parameters({
'algorithm': freesasa.LeeRichards,
'n-slices': 10
}))
selections = freesasa.selectArea(('alanine, resn ala', saving),
structure, resulta)
for key in selections:
print(key, ": %.2f A2" % selections[key])
a = selections[key]
acc.append(a)
l = acc[0::2]
access = l
print(acc)
print(l)
logacc = [math.log(y, 10) for y in l]
print(logacc)
from Bio.SeqUtils.ProtParam import ProteinAnalysis
from Bio.SeqUtils import ProtParamData
from Bio import SeqIO
with open('../../samples/pdbaa') as fh:
for rec in SeqIO.parse(fh,'fasta'):
myprot = ProteinAnalysis(str(rec.seq))
print(myprot.count_amino_acids())
print(myprot.get_amino_acids_percent())
print(myprot.molecular_weight())
print(myprot.aromaticity())
print(myprot.instability_index())
print(myprot.flexibility())
print(myprot.isoelectric_point())
print(myprot.secondary_structure_fraction())
print(myprot.protein_scale(ProtParamData.kd, 9, .4))
aromaticity = []
instability_index = []
# flexibility = []
isoelectric_point = []
secondary_structure_fraction = []
for protein in sequences_a:
analysed_seq = ProteinAnalysis(str(protein.seq).replace("X", ""))
gravy_index.append([sys.argv[1], analysed_seq.gravy()])
aromaticity.append([sys.argv[1], analysed_seq.aromaticity()])
instability_index.append([sys.argv[1], analysed_seq.instability_index()])
# flexibility.append([sys.argv[1], analysed_seq.flexibility()])
isoelectric_point.append([sys.argv[1], analysed_seq.isoelectric_point()])
secondary_structure_fraction.append(
[sys.argv[1], analysed_seq.secondary_structure_fraction()])
for protein in sequences_b:
analysed_seq = ProteinAnalysis(str(protein.seq).replace("X", ""))
gravy_index.append([sys.argv[2], analysed_seq.gravy()])
aromaticity.append([sys.argv[2], analysed_seq.aromaticity()])
instability_index.append([sys.argv[2], analysed_seq.instability_index()])
# flexibility.append([sys.argv[2], analysed_seq.flexibility()])
isoelectric_point.append([sys.argv[2], analysed_seq.isoelectric_point()])
secondary_structure_fraction.append(
[sys.argv[2], analysed_seq.secondary_structure_fraction()])
# Box plot showing gravy indexes
gravy_index = pd.DataFrame(gravy_index, columns=["Filename", "Gravy Index"])
def openfile():
global my_seq
global antigenicity
global m, a, c, b
from tkinter import filedialog
root = Tk()
root.filename = filedialog.askopenfilename(
initialdir="/",
title="Select file",
filetypes=(("pdb files", "*.pdb"), ("pdb files", "*.pdb")))
print(root.filename)
structure_id = "1e6j"
structure = PDBParser().get_structure(structure_id, root.filename)
ppb = PPBuilder()
for pp in ppb.build_peptides(structure):
my_seq = pp.get_sequence() # type: Seq
print(my_seq)
for model in structure:
for chain in model:
print(chain)
sequence = list(my_seq)
m = ''.join(sequence) # type: str
print(m)
length = len(m) # type: int
print(length)
print("Sequence consist of", len(m), "Amino Acids")
from Bio.SeqUtils.ProtParam import ProteinAnalysis
analysed_seq = ProteinAnalysis(m)
print("Molecular weight = ", analysed_seq.molecular_weight())
print("Amino Acid Count = ", analysed_seq.count_amino_acids())
print("Secondary structure fraction =",
analysed_seq.secondary_structure_fraction())
kd = {
'A': 1.8,
'R': -4.5,
'N': -3.5,
'D': -3.5,
'C': 2.5,
'Q': -3.5,
'E': -3.5,
'G': -0.4,
'H': -3.2,
'I': 4.5,
'L': 3.8,
'K': -3.9,
'M': 1.9,
'F': 2.8,
'P': -1.6,
'S': -0.8,
'T': -0.7,
'W': -0.9,
'Y': -1.3,
'V': 4.2
}
c = list(analysed_seq.flexibility())
b = list(analysed_seq.protein_scale(kd, 10, 1.0))
i = 1
j = -1 # type: int
k = 9
while i <= (length - 10):
print("Sequence is = ", m[j + 1:k + 1])
print("Flexibility value = ", c[j + 1])
print("Hydrophilicity value = ", b[j + 1])
ana_seq = ''.join(m[j + 1:k + 1])
analyze_seq = ProteinAnalysis(ana_seq)
# For Secondary structure Analysis
print("Secondary structure fraction =",
analyze_seq.secondary_structure_fraction())
a = list(analyze_seq.secondary_structure_fraction())
global tupleall
tupleall = (m[j + 1:k + 1], c[j + 1], b[j + 1], a)
print(tupleall[0], tupleall[2], tupleall[1], tupleall[3])
i = i + 1
if a[0] >= a[1]:
a[0] = 1
else:
a[0] = a[1]
# For Hydrophilicity
if b[j + 1] > 0.5:
b[j + 1] = 2
elif b[j + 1] < 0.5 or b[j + 1] > 0:
b[j + 1] = 1
elif b[j + 1] > 0 or b[j + 1] > -0.4:
b[j + 1] = -1
elif b[j + 1] < -0.4:
b[j + 1] = -2
else:
b[j + 1] = 0
# For Flexibility
if c[j + 1] > 1.0:
c[j + 1] = 1
else:
c[j + 1] = 0
# For antigenicity Index
antigenicity = 0.3 * b[j + 1] + 0.15 * 1 + 0.15 * c[j + 1] + 0.2 * a[0]
print("antigenicity", antigenicity)
j += 1
k += 1
zip_.extractall(tmpdir.path)
for test_pdb in tmpdir.path.glob("*.pdb"):
for record in SeqIO.parse(test_pdb, "pdb-atom"):
sequence = str(record.seq).replace('X', 'G')
protein = ProteinAnalysis(str(sequence))
p_len.append(len(sequence))
mol_w.append(protein.molecular_weight())
iso_p.append(protein.isoelectric_point())
smell.append(protein.aromaticity())
taste_factor.append(protein.gravy())
insta_ind.append(protein.instability_index())
char_at_acid.append(protein.charge_at_pH(1))
char_at_neutral.append(protein.charge_at_pH(7))
char_at_base.append(protein.charge_at_pH(14))
helter_skeler.append(protein.secondary_structure_fraction()[0])
turnip.append(protein.secondary_structure_fraction()[1])
garfield.append(protein.secondary_structure_fraction()[2])
for x in amino_acids:
n = protein.count_amino_acids()[x]
for y in d_count.keys():
if y[-1] == x:
d_count[y].append(n)
for a in amino_acids:
m = protein.get_amino_acids_percent()[a]
for b in d_perc.keys():
if b[-1] == a:
d_perc[b].append(m)
#areas = get_area_classes(test_pdb)
#polar_area.append(areas[0])
#apolar_area.append(areas[1])
aminoPercent=[]
secstruct=[]
hydrophob=[]
hydrophil=[]
surface=[]
gravy=[]
molweight=[]
instidx=[]
flex=[]
for seq in sequences:
X=ProteinAnalysis(str(seq))
isoelectricPt.append(X.isoelectric_point())
aromaticity.append(X.aromaticity())
aminoPercent.append(X.get_amino_acids_percent())
secstruct.append(X.secondary_structure_fraction())
# These features throw Key & Value Errors due to non standard amino acids
# (i.e. out of the 20 standard ones) e.g. X, U etc
try:
gravy.append(X.gravy())
molweight.append(X.molecular_weight())
instidx.append(X.instability_index())
flex.append(X.flexibility())
hydrophob.append(X.protein_scale(ProtParamData.kd, 9, 0.4))
hydrophil.append(X.protein_scale(ProtParamData.hw, 9, 0.4))
surface.append(X.protein_scale(ProtParamData.em, 9, 0.4))
except (KeyError,ValueError):
gravy.append(0)
molweight.append(0)
"," + str(mol_w) + "," + str(ins) + "," + str(cnt) +
"\n")
else:
with open(path_ + "\\data\\output\\svm_out.txt", "a+") as s:
s.write("-1 " + ' '.join("{}:{}".format(k, v)
for k, v in a.items()) + "\n")
with open(pth + "weka_output.arff", "a+") as w:
w.write(' '.join("{},".format(x)
for x in list(aa_count.values())) + " loc\n")
with open(pth + "tain_DL.csv", "a+") as DPL:
DPL.write(''.join("{},".format(x)
for x in list(aa_count.values())) +
str(round(aromat, 3)) + "," +
str(round(fraction[0], 3)) + "," +
str(round(fraction[1], 3)) + "," +
str(round(fraction[2], 3)) + "," + str(round(iso, 3)) +
"," + str(mol_w) + "," + str(ins) + "," + "0" + "\n")
for seq, cl in zip(seq_list, cls_list): # main loop to extract the features
_ = ProteinAnalysis(seq) # Biopython protein analysis package
aa_count = (_.count_amino_acids()) # amino acid count
aromat, fraction, iso = _.aromaticity(), _.secondary_structure_fraction(
), _.isoelectric_point()
try:
mol_w, ins = ("%0.2f" % _.molecular_weight()), ("%0.2f" %
_.instability_index())
except Exception:
mol_w, ins = mol_w, ins # aromaticity, sec_strucure_fraction, iso_electric point , molecular weight, instability index
format_output(aa_count, cl)
