Swiss to Nexus Sequence Converter

Input format: swiss Swiss-Prot aka UniProt format.

Output format: nexus The NEXUS multiple alignment format, also known as PAUP format.

You can also convert between these formats by using command line tools.

On Windows install WSL, on Mac or Linux start terminal

Install BioPython

Run following script:

from Bio import SeqIO

records = SeqIO.parse("THIS_IS_YOUR_INPUT_FILE.swiss", "swiss")
count = SeqIO.write(records, "THIS_IS_YOUR_OUTPUT_FILE.nexus", "nexus")
print("Converted %i records" % count)

Or you can use this site as online swiss to nexus converter by selecting your formats & file.