Created
January 2, 2017 21:38
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Extracting protein features as .tsv using blosum62 from a fasta file
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import numpy as np | |
import sys | |
# Amino acid substitution matrix | |
blosum62 ={ | |
"C":[9,-1,-1,-3,0,-3,-3,-3,-4,-3,-3,-3,-3,-1,-1,-1,-1,-2,-2,-2], | |
"S":[-1,4,1,-1,1,0,1,0,0,0,-1,-1,0,-1,-2,-2,-2,-2,-2,-3], | |
"T":[-1,1,4,1,-1,1,0,1,0,0,0,-1,0,-1,-2,-2,-2,-2,-2,-3], | |
"P":[-3,-1,1,7,-1,-2,-1,-1,-1,-1,-2,-2,-1,-2,-3,-3,-2,-4,-3,-4], | |
"A":[0,1,-1,-1,4,0,-1,-2,-1,-1,-2,-1,-1,-1,-1,-1,-2,-2,-2,-3], | |
"G":[-3,0,1,-2,0,6,-2,-1,-2,-2,-2,-2,-2,-3,-4,-4,0,-3,-3,-2], | |
"N":[-3,1,0,-2,-2,0,6,1,0,0,-1,0,0,-2,-3,-3,-3,-3,-2,-4], | |
"D":[-3,0,1,-1,-2,-1,1,6,2,0,-1,-2,-1,-3,-3,-4,-3,-3,-3,-4], | |
"E":[-4,0,0,-1,-1,-2,0,2,5,2,0,0,1,-2,-3,-3,-3,-3,-2,-3], | |
"Q":[-3,0,0,-1,-1,-2,0,0,2,5,0,1,1,0,-3,-2,-2,-3,-1,-2], | |
"H":[-3,-1,0,-2,-2,-2,1,1,0,0,8,0,-1,-2,-3,-3,-2,-1,2,-2], | |
"R":[-3,-1,-1,-2,-1,-2,0,-2,0,1,0,5,2,-1,-3,-2,-3,-3,-2,-3], | |
"K":[-3,0,0,-1,-1,-2,0,-1,1,1,-1,2,5,-1,-3,-2,-3,-3,-2,-3], | |
"M":[-1,-1,-1,-2,-1,-3,-2,-3,-2,0,-2,-1,-1,5,1,2,-2,0,-1,-1], | |
"I":[-1,-2,-2,-3,-1,-4,-3,-3,-3,-3,-3,-3,-3,1,4,2,1,0,-1,-3], | |
"L":[-1,-2,-2,-3,-1,-4,-3,-4,-3,-2,-3,-2,-2,2,2,4,3,0,-1,-2], | |
"V":[-1,-2,-2,-2,0,-3,-3,-3,-2,-2,-3,-3,-2,1,3,1,4,-1,-1,-3], | |
"F":[-2,-2,-2,-4,-2,-3,-3,-3,-3,-3,-1,-3,-3,0,0,0,-1,6,3,1], | |
"Y":[-2,-2,-2,-3,-2,-3,-2,-3,-2,-1,2,-2,-2,-1,-1,-1,-1,3,7,2], | |
"W":[-2,-3,-3,-4,-3,-2,-4,-4,-3,-2,-2,-3,-3,-1,-3,-2,-3,1,2,11] | |
} | |
# Read sequences | |
print("Reading sequences") | |
seq_names = [] | |
sequences = [] | |
with open(sys.argv[1]) as f: | |
for line in f.readlines(): | |
if line[0] == '>': seq_names.append(line[1:].strip()) | |
elif len(line)>3: sequences.append(line.strip()) | |
# Convert each sequence into a feature-vector with 20 entries per amino acid | |
print("Generating feature list") | |
feature_list = [] | |
for seq in sequences: | |
features = [] | |
for aa in seq: | |
features += blosum62[aa] | |
feature_list.append(features) | |
np.savetxt(sys.argv[2], feature_list, fmt="%d", delimiter='\t') |
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