General :: Generating Two Bash Arguments From 'ls'?

I have a directory containing the following files.

Code:

1-res-opt-I189N-0001.pdb
1-res-opt-I189N-0002.pdb
1-res-opt-I189N-0003.pdb
1-res-opt-I189N-0004.pdb

[code].....

What I want is something like:

Code:

for i in *.pdb
do
python my_script.py 1-res-opt-I189N-00{1..10}.pdb 3-res-opt-I189N-00{1..10}.pdb
done

such that always the two files with corresponding index are submitted together to the Python script. How do I do that?