使用 Biopython 从 FASTA 文件中获取 ID

Question

我正在使用 Biopython 从带有核苷酸序列的 FASTA 文件中获取一些信息。但是，我只想从该文件中获取 ID 和序列。我有这个代码：

from Bio import SeqIO

for seq_nucleotides in SeqIO.parse("CDS_sequence.txt", "fasta"):
   print(seq_nucleotides.description)
   print(seq_nucleotides.seq)

得到这个：

lcl|NC_000913.3_cds_NP_414584.1_1 [gene=fixB] [locus_tag=b0042] [db_xref=UniProtKB/Swiss-Prot :P31574] [protein=推定的电子转移黄素蛋白 FixB] [protein_id=NP_414584.1] [location=43188..44129] [gbkey=CDS]

ATGAACACGTTTCTCAAGTCTGGGTATTCGCGATACCCCTTCTCGTCTGCCGGAACTGATGAACGGTGCGCAGGCTTTAGCTAATCAAATCAACACCTTTGTCCTCAATGATGCCGACGGCGCACAGGCAATCCAGCTCGGCGCTAATCATGTCTGGAAATTAAACGGCAAACCGGACGATCGGATGATCGAAGATTACGCCG ...

我只需要获取 protein_Id = NP_414584.1 和序列。但我不知道如何从字符串描述中提取 ID 并得到如下内容：

NP_414584.1

ATGAACACGTTTCTCAAGTCTGGGTATTCGCGAT...

Answer 1

from Bio import SeqIO

def sequence_extract_fasta(fasta_files):
    # Defining empty list for the Fasta id and fasta sequence variables
    fasta_id = []
    fasta_seq = []

    # opening given fasta file using the file path
    with open(fasta_files, 'r') as fasta_file:
        # extracting multiple data in single fasta file using biopython
        for record in SeqIO.parse(fasta_file, 'fasta'):  # (file handle, file format)
        
            # appending extracted fasta data to empty lists variables
            fasta_seq.append(record.seq)
            fasta_id.append(record.id)
    return fasta_id, fasta_seq

使用 Biopython 从 FASTA 文件中获取 ID

Get ID from a FASTA file with Biopython

python

biopython

fasta