In this case, in FASTA format

>>> writer = SeqRecord.io.make_writer(format = "fasta")
>>> writer.write(record)
>100K_RAT 100 KD PROTEIN (EC 6.3.2.-).
MMSARGDFLNYALSLMRSHNDEHSDVLPVLDVCSLKHVAYVFQALIYWIKAMNQQTTLDTPQLERKRTRELL
          ...
PLYSSKQILKQKLLLAIKTKNFGFV