Dear all,

I have a complex protein (with a knot in the polypeptide chain)
and want to show the rough course of the chain, so everyone can
easily see that there is a knot inside.

I don't know how to draw such a complex 3D object in a drawing
program, so I want to do that in PyMol (or another similar program).

What I did is copying a part of the protein sequence and transformed
it in a new object. I want to superimpose the new object drawed
in ribbons with the whole protein in cartoon representation. I made
the ribbons big. How can I make it transparent, too, by the way?

For showing the rough course of the polypeptide chain, the ribbon
should not follow every alpha-helix, loops and so on. What I want to
do is like box filtering the chain.
I tried to delete atoms, but then the ribbon is broken. How can
I connect these atoms, must the c-alpha carbons be connected
by peptide bonds so the ribbon is drawed? But I want to delete
atoms, so the connections between the remaining atoms that
form the ribbon will have larger distances than normal bonds.
Is that possible to do that at all in PyMol?

Another option would be: taking some c-alpha carbons that
show the rough course of the chain, and building a povray
file that draws it like a ribbon or flexible tube, and input that
povray code into the povray-file of the rendered protein.

Any help is greatly apprechiated!
Thanks!
Simon

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